Standard English Conventions (SEC) questions make up approximately 26 of the 54 questions across both Reading and Writing modules of the Digital SAT - nearly half the section. The sheer number of grammar questions makes this the single most preparation-efficient area of the entire test: improving from 60% to 90% accuracy on grammar questions adds approximately 8 correct answers per test, which corresponds to a substantial score improvement.

Because grammar rules are deterministic (there is always a correct answer based on a specific rule), they have a higher skill ceiling than comprehension or inference questions. A student who has internalized all ten rule categories in this article approaches grammar questions with the confidence of applying known rules rather than making uncertain interpretive judgments. These questions test grammar, punctuation, and usage: the mechanical correctness of written English as defined by standard academic and professional conventions. Unlike the reading comprehension questions, SEC questions have right answers that are determined by rule, not interpretation. A comma is either correct or incorrect in a given position. A verb either agrees with its subject or it does not.

This article is the complete grammar reference for the Digital SAT - the single resource covering every convention rule tested, organized by frequency of appearance. Students who master these rules and can apply them under timed conditions will find SEC questions among the most reliable correct answers in the section.

For the complete grammar section strategy, see the complete SAT grammar rules guide. For deep coverage of the most frequently tested rule, see SAT Writing subject-verb agreement and pronoun-antecedent clarity. For punctuation rules in depth, see SAT Writing colon, semicolon, dash and apostrophe rules. For timed practice, the free SAT Reading and Writing practice questions on ReportMedic provide Digital SAT-format grammar questions across all rule categories.

How to Use This Guide

Each grammar rule is presented with a statement of the rule, the key error patterns the SAT exploits, and multiple examples showing both the incorrect and correct versions. The examples are organized from straightforward to tricky, matching the range of difficulty on the actual test.

This guide is designed to be both a study resource and a reference: read it through once for comprehensive rule learning, then return to specific sections when reviewing particular error types. Students who work through all ten rule sections and then complete 50 to 100 practice grammar questions with this guide as a reference typically see significant accuracy improvement within two to three weeks.

The recommended sequence: read Rules 1 through 4 (the highest-frequency categories), then practice 20 grammar questions focusing on those rules. Continue with Rules 5 through 7, practice 20 more questions. Finish with Rules 8 through 10, practice a final 20 questions. This staged approach builds competence in the most frequently tested categories before adding lower-frequency rules, producing the fastest measurable improvement in SEC section accuracy.

The rules are ordered by frequency: subject-verb agreement appears most often, so it comes first. Idiomatic expressions appear least often, so they come last. Students who work through this guide in order build their highest-frequency skills first and reinforce them with lower-frequency rules later.

The single most productive preparation habit for SEC questions: after learning each rule, find five examples of that rule in a practice passage and identify whether each is applied correctly. This application habit is what converts rule knowledge into answer-selection skill.

Students who complete this article, work through the example bank, and then complete 50 to 100 practice Digital SAT grammar questions will find that SEC questions become among the most manageable in the section. The deterministic nature of grammar rules - right answers are always right, wrong answers are always wrong - makes preparation directly predictive of performance in a way that reading comprehension questions cannot match.

For each rule category mastered, a student gains reliable access to the questions testing that category. Ten rule categories mastered = reliable access to all SEC questions. That reliability is what makes SEC preparation uniquely rewarding: the investment in rule knowledge pays off with complete consistency, not the partial consistency that characterizes more interpretive question types.

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Rule 1: Subject-Verb Agreement

RULE: The verb must agree in number with its grammatical subject, not with any noun that appears between the subject and verb.

THE SAT’S PRIMARY EXPLOIT: placing a prepositional phrase or relative clause between the subject and verb, so that the noun nearest the verb is not the subject. Students hear the wrong noun as the subject and produce an agreement error.

EXAMPLE PATTERN 1: Prepositional phrase between subject and verb. INCORRECT: “The box of chocolates are on the table.” CORRECT: “The box of chocolates is on the table.” The subject is “box” (singular), not “chocolates.” The prepositional phrase “of chocolates” modifies “box” and does not change the subject.

INCORRECT: “The team of researchers have published their findings.” CORRECT: “The team of researchers has published its findings.” “Team” is the subject. “Researchers” is the object of the preposition “of.”

A note on “data”: in formal academic writing, “data” is typically treated as a plural noun (the original Latin plural of “datum”). “The data show…” is formally correct. “The data shows…” reflects common informal usage. The Digital SAT generally follows formal academic convention, so “the data show/are/were” is likely the preferred answer on questions involving “data.”

EXAMPLE PATTERN 2: Relative clause between subject and verb. INCORRECT: “The report that was written by all three scientists confirm the hypothesis.” CORRECT: “The report that was written by all three scientists confirms the hypothesis.” “Report” is the subject (singular). The relative clause “that was written by all three scientists” modifies “report” but does not change its number.

The relative clause pattern is one of the most frequently tested agreement traps because the relative clause can be long (several words with plural nouns inside it), making the plural feel like the correct agreement. The rule is absolute: the main clause verb agrees with the main clause subject, never with any noun inside a relative clause.

EXAMPLE PATTERN 3: Inverted sentence (verb before subject). INCORRECT: “Among the ruins were a single pillar still standing.” CORRECT: “Among the ruins was a single pillar still standing.” “Pillar” is the subject (singular). Inversion makes the subject appear after the verb, creating the temptation to match the verb to the nearby plural noun “ruins.”

Inverted sentence test: rearrange to standard order (“A single pillar was among the ruins still standing.”) to confirm subject and verb before re-inverting. This confirmation prevents agreement errors in inverted structures.

EXAMPLE PATTERN 4: Compound subjects with “or/nor.” INCORRECT: “Either the students or the teacher are responsible.” CORRECT: “Either the students or the teacher is responsible.” With “or/nor” joining subjects, the verb agrees with the closer subject. “Teacher” is closest to the verb and is singular.

IMPORTANT: “And” compounds subjects (making them plural). “Or/nor” does not compound subjects - it offers alternatives. “Either the students or the teacher” means one or the other, not both. The singular “teacher” (closer to the verb) determines the verb form.

INCORRECT: “Neither the report nor the data are available.” CORRECT: “Neither the report nor the data is available.” Again, the closer subject (“data,” treated as singular in this context) determines the verb form.

EXAMPLE PATTERN 5: Collective nouns. INCORRECT: “The committee are meeting tomorrow.” CORRECT: “The committee is meeting tomorrow.” When a collective noun (team, committee, group, jury, class) acts as a unit, it takes a singular verb.

A broader list of collective nouns that are treated as singular on the Digital SAT: audience, band, board, class, club, crew, crowd, department, faculty, family, government, group, jury, majority, minority, orchestra, panel, public, staff, team. All of these take singular verbs when they act as a unified body.

INCORRECT: “The faculty has not reached consensus.” CORRECT: “The faculty have not reached consensus.” (if acting as individuals) OR “The faculty has not reached consensus.” (if acting as a unit) Context determines whether to treat a collective noun as singular or plural. On the SAT, the typical expected answer is singular for collective nouns.

EXAMPLE PATTERN 6: Indefinite pronoun subjects. ALWAYS SINGULAR: each, every, everyone, everybody, everything, someone, somebody, something, anyone, anybody, anything, no one, nobody, nothing, either, neither, one. “Each of the students is responsible for their own work.” (verb: “is,” singular)

Note that “each of the students” is singular even though “students” (inside the prepositional phrase) is plural. “Each” is the subject; “of the students” is a modifying phrase. This is the same intervening-phrase trap applied to indefinite pronouns: the noun in the “of” phrase is not the subject. “Neither of the options is acceptable.” (verb: “is,” singular) “Everyone has submitted their forms.” (verb: “has,” singular)

Memory trick for singular indefinite pronouns: if it starts with “every-,” “any-,” “some-,” or “no-,” it is always singular. “Everyone,” “everything,” “everybody” = singular. “Anyone,” “anything,” “anybody” = singular. “Someone,” “something,” “somebody” = singular. “No one,” “nothing,” “nobody” = singular.

ALWAYS PLURAL: both, few, many, several, others. “Both of the options are available.” (verb: “are,” plural) “Few in the audience were impressed.” (verb: “were,” plural)

A useful grouping memory device: indefinite pronouns that refer to a group as individuals (each, every, either, neither) are singular. Indefinite pronouns that refer to a group collectively (both, few, many, several) are plural. This conceptual distinction explains the rule rather than requiring pure memorization.

DEPENDS ON CONTEXT: some, all, none, most, more, any. “Some of the water is contaminated.” (“water” is uncountable → singular) “Some of the reports are missing.” (“reports” is countable → plural) “None of the information was useful.” (“information” is uncountable → singular) “None of the documents were signed.” (“documents” is countable → plural)

For context-dependent indefinite pronouns, always look at the noun in the “of” phrase. The rule is simple: the verb agrees with that noun. If the noun is a mass noun or singular, use a singular verb. If the noun is a countable plural, use a plural verb. This “of noun” agreement rule handles every context-dependent case on the Digital SAT.

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Rule 2: Pronoun-Antecedent Agreement

RULE: A pronoun must agree in number and person with its antecedent (the noun it refers to). Additionally, a pronoun must have a clear, unambiguous antecedent.

THE SAT’S PRIMARY EXPLOIT 1: singular antecedent with plural pronoun.

This exploit works by placing a plural noun close to the pronoun, tempting students to match the pronoun to the nearby plural rather than to the true (singular) antecedent. Always trace the pronoun back to its actual referent, ignoring intervening nouns. INCORRECT: “Every student should submit their paper by Friday.” CORRECT: “Every student should submit his or her paper by Friday.” OR restructure: “All students should submit their papers by Friday.” “Every student” is singular. “Their” is plural. The SAT traditionally treats this as an error, though contemporary usage increasingly accepts singular “they.”

INCORRECT: “Each department must update their records.” CORRECT: “Each department must update its records.” “Department” is singular. “Its” (singular) agrees; “their” does not.

This is among the most common pronoun agreement errors because “their” has become widely used as a singular gender-neutral pronoun in everyday speech. The Digital SAT still tests the traditional agreement rule: singular antecedents require singular pronouns. “Each,” “every,” “either,” “neither,” “one,” “someone,” “anyone,” “no one” all require singular pronouns (“its,” “his or her,” not “their”).

THE SAT’S PRIMARY EXPLOIT 2: ambiguous pronoun reference. INCORRECT: “When Elena met Sofia, she was nervous.” CORRECT: “When Elena met Sofia, Elena was nervous.” OR “When Elena met Sofia, Sofia was nervous.” “She” could refer to either Elena or Sofia. The fix is to replace the pronoun with the specific noun.

INCORRECT: “The manager told the employee that she had made an error.” CORRECT: “The manager told the employee that the employee had made an error.” OR “The manager told the employee, ‘You made an error.’” Ambiguous: “she” could be the manager or the employee.

THE SAT’S PRIMARY EXPLOIT 3: pronoun with no antecedent. INCORRECT: “In the report, they concluded that the treatment was effective.” CORRECT: “In the report, the researchers concluded that the treatment was effective.” “They” has no specific antecedent. The report is not a person; “they” needs a specific noun referent.

INCORRECT: “The article was criticized, but they did not respond to the criticism.” CORRECT: “The article was criticized, but the authors did not respond to the criticism.”

ADDITIONAL PATTERN: pronoun case (subject vs object vs possessive). SUBJECT: I, he, she, we, they, who OBJECT: me, him, her, us, them, whom POSSESSIVE: my, his, her, our, their, whose

A reliable pronoun case test: remove the compound element. “The award was given to Elena and [I/me]” → “The award was given to [I/me].” “The award was given to I” is obviously wrong; “the award was given to me” is correct. The compound element “Elena and” does not change the case requirement.

INCORRECT: “The award was given to Elena and I.” CORRECT: “The award was given to Elena and me.” Test: “The award was given to I” → clearly wrong. “The award was given to me” → correct. “Elena and” adds a compound, but the correct case is still “me.”

INCORRECT: “Who did you give the report to?” CORRECT: “Whom did you give the report to?” OR “To whom did you give the report?” “Whom” is the object of the preposition “to.” Test: substitute “him” (object) or “he” (subject). “You gave it to him” → “whom.”

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Rule 3: Verb Tense Consistency

RULE: Maintain consistent verb tense throughout a passage or sentence unless there is a logical reason for a tense shift (describing events that actually occurred at different times).

THE SAT’S PRIMARY EXPLOIT: introducing an unjustified tense shift within a sentence or across sentences that describe the same time period.

Tense consistency in longer passages: for SEC questions embedded in reading passages, the tense of the surrounding sentences provides the context. Read two to three sentences before and after the underlined portion to establish the tense context. The answer that matches the established tense (unless a legitimate shift is required) is usually correct. If the passage is written in past tense and describes a historical event, an answer choice that shifts to present tense is likely wrong (unless describing a currently existing state or fact). Use the passage tense context to guide the correct answer selection.

EXAMPLE PATTERN 1: Unjustified shift from past to present. INCORRECT: “The researchers conducted the study and record their findings in a journal article.” CORRECT: “The researchers conducted the study and recorded their findings in a journal article.” Both events are in the past. “Record” is present tense; it should be “recorded.”

EXAMPLE PATTERN 2: Unjustified shift from present to past. INCORRECT: “The report argues that climate change is real and demonstrated its effects through multiple studies.” CORRECT: “The report argues that climate change is real and demonstrates its effects through multiple studies.” Both are describing the report’s current content. “Demonstrated” is past; “demonstrates” is present and consistent with “argues.”

The tense consistency test for connected verbs: when two verbs describe the same timeframe or the same subject’s actions, they should share the same tense. “The report argues… and demonstrates” (both present, describing the report’s content). “The researchers conducted… and published” (both past, describing historical actions). Mixed tenses within a single timeframe signal an error.

EXAMPLE PATTERN 3: Legitimate tense shift (two genuinely different time periods). CORRECT: “The scientists discovered in 2010 what researchers have been trying to prove for decades.” “Discovered” (simple past) and “have been trying” (present perfect) correctly indicate different time relationships.

CORRECT: “Although the original study was conducted in 1985, its conclusions remain influential today.” “Was conducted” (past) and “remain” (present) legitimately describe events at different times.

EXAMPLE PATTERN 4: Conditional sentences. INCORRECT: “If the experiment had been designed differently, the results will have been more reliable.” CORRECT: “If the experiment had been designed differently, the results would have been more reliable.” Past unreal conditional: “had been” + “would have been.”

INCORRECT: “If the treatment is administered correctly, patients would recover faster.” CORRECT: “If the treatment is administered correctly, patients will recover faster.” (real conditional) OR: “If the treatment were administered correctly, patients would recover faster.” (hypothetical)

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Rule 4: Comma Rules

Comma rules are among the most tested punctuation categories on the Digital SAT. There are five core comma rules, each with specific application conditions.

Comma Rule 4a: After Introductory Elements

RULE: Use a comma after an introductory word, phrase, or clause that precedes the main clause.

After introductory transition words: “However,” “Therefore,” “Nevertheless,” “Furthermore,” “Meanwhile,” “In addition,” “For example,” → comma required.

The comma after introductory elements signals to the reader: “the setup is complete; the main clause begins here.” Without this comma, readers may misparse the sentence, attaching the introductory element to the main clause incorrectly. The SAT tests this consistently by presenting answer choices with and without the introductory comma.

INCORRECT: “However the study was inconclusive.” CORRECT: “However, the study was inconclusive.”

After introductory prepositional phrases (generally four or more words): “In the early 1990s,” “Before the war began,” “Throughout the study period,” → comma typically required.

INCORRECT: “In the early 1990s researchers began studying the phenomenon.” CORRECT: “In the early 1990s, researchers began studying the phenomenon.”

A note on short introductory phrases: very short prepositional phrases (two words or fewer) can sometimes omit the comma without confusion: “In 2020 researchers published their findings.” The Digital SAT typically shows comma-after-introductory-phrase as a tested pattern with longer phrases (four or more words). For shorter phrases, context determines whether the comma is required for clarity.

After introductory dependent clauses: “Although the results were surprising,” “Because the sample size was small,” “When the investigation began,” → comma required.

INCORRECT: “Although the results were surprising the team continued the study.” CORRECT: “Although the results were surprising, the team continued the study.”

Comma Rule 4b: Around Nonessential (Parenthetical) Clauses

RULE: Commas set off information that is not essential to the meaning of the sentence. Essential information (which clause) uses no commas. Nonessential information (which clause OR who/that clause providing extra detail) uses commas on both sides.

KEY DISTINCTION: “which” vs “that” “THAT” introduces essential information (no commas). “WHICH” introduces nonessential information (commas required).

INCORRECT: “The study, that was published in 2020, showed significant results.” CORRECT: “The study that was published in 2020 showed significant results.” (essential - identifies which study) OR: “The study, which was published in 2020, showed significant results.” (nonessential - additional information)

Test: if the clause can be removed without changing the core meaning, it is nonessential and requires commas.

NONESSENTIAL (commas): “The committee, which meets quarterly, has approved the new policy.” Removing “which meets quarterly” → “The committee has approved the new policy.” Still makes sense. Use commas.

ESSENTIAL (no commas): “The committee that meets quarterly has approved the new policy.” Removing “that meets quarterly” → “The committee has approved the new policy.” Changes meaning - now implies ALL committees, not specifically the quarterly one. No commas.

Comma Rule 4c: In Lists (Serial Comma)

RULE: Use commas to separate items in a list of three or more. The SAT consistently uses the serial comma (Oxford comma) before the final “and” or “or.”

INCORRECT: “The study examined diet, exercise and sleep.” CORRECT: “The study examined diet, exercise, and sleep.”

The Digital SAT is consistent in preferring the serial comma. In answer choice comparisons, the version with the serial comma is correct; the version without is wrong. This is one of the most reliable answer choice signals: if one answer has “X, Y, and Z” and another has “X, Y and Z,” the first is correct.

INCORRECT: “Participants could choose from running, cycling or swimming.” CORRECT: “Participants could choose from running, cycling, or swimming.”

Comma Rule 4d: Before Coordinating Conjunctions Joining Independent Clauses

RULE: When a coordinating conjunction (for, and, nor, but, or, yet, so - FANBOYS) joins two complete independent clauses, a comma precedes the conjunction.

INCORRECT: “The results were promising but the sample size was too small to draw conclusions.” CORRECT: “The results were promising, but the sample size was too small to draw conclusions.” Both “the results were promising” and “the sample size was too small to draw conclusions” are complete sentences. Comma before “but.”

A note on “for” as a coordinating conjunction: in contemporary usage, “for” as a coordinating conjunction meaning “because” is rare and formal. “He studied hard, for the exam was important.” This use does appear occasionally on the Digital SAT. It follows the same rule: comma before “for” when joining independent clauses.

INCORRECT: “She studied all weekend and she passed the exam.” CORRECT: “She studied all weekend, and she passed the exam.” Both clauses are complete. Comma before “and.”

DO NOT add a comma when the conjunction joins two phrases (not complete clauses). INCORRECT: “She studied all weekend, and passed the exam.” CORRECT: “She studied all weekend and passed the exam.” “Passed the exam” is not a complete clause (no subject). No comma before “and.”

Comma Rule 4e: Separating Coordinate Adjectives

RULE: When two adjectives independently modify a noun (each modifying the noun directly, not one modifying the other), separate them with a comma.

Test: Insert “and” between the adjectives. If the sentence still sounds natural, use a comma.

CORRECT: “a long, difficult exam” (long AND difficult exam - both modify “exam” independently → comma) INCORRECT: “a long difficult exam” (missing comma between coordinate adjectives)

CORRECT: “a large wooden table” (a table that is wooden and large does NOT require comma - “wooden” modifies “table,” “large” modifies “wooden table” as a unit)

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Rule 5: Colon and Semicolon

Colon Rules

RULE: A colon must follow a complete independent clause. It introduces a list, an explanation, or an elaboration.

CORRECT: “The study found three main factors: diet, exercise, and sleep.” “The study found three main factors” is a complete clause. The colon introduces the list.

The colon test: is what comes before the colon a complete sentence on its own? If yes, the colon is potentially correct. If no, remove the colon or restructure. This test eliminates the most common colon error: placing a colon after a verb or after “are/include.”

INCORRECT: “The study found: diet, exercise, and sleep to be the main factors.” “The study found” is not a complete clause before the colon. Never use a colon directly after a verb.

INCORRECT: “The three factors are: diet, exercise, and sleep.” “The three factors are” is not a complete clause. No colon after “are” (or “is,” “was,” “were,” “include,” “include”).

CORRECT: “The three main factors are diet, exercise, and sleep.” No colon needed when a complete list follows naturally after a verb.

A common mistake: inserting a colon before a list introduced by a verb. “The factors include:” is incorrect because “include” is a verb, and colons cannot follow verbs. “The factors are three:” is also wrong. The colon must follow a complete clause that does not end with a verb. If the sentence would be complete without the list, the colon is correct. If the sentence would not be complete without the list, the colon is incorrect.

CORRECT: “There is one thing every student needs: practice.” Complete clause (“There is one thing every student needs”) + colon + explanation (“practice”).

Semicolon Rules

RULE: A semicolon joins two complete, related independent clauses without a conjunction. It can also appear before transitional phrases (“however,” “therefore,” “furthermore,” “nevertheless”) that join independent clauses.

CORRECT: “The study was well-designed; the results were reliable.” Two complete clauses. Semicolon joins them without a conjunction. Note that the two clauses do not have to express contrasting ideas to be joined by a semicolon; they simply have to be related (which “well-designed” and “reliable results” clearly are).

The “both complete” test for semicolons: cover the semicolon and read each clause individually. Does each side sound like a complete sentence? If yes, the semicolon is potentially correct. If either side is not a complete sentence, the semicolon is incorrect and the sentence needs restructuring.

INCORRECT: “The study was well-designed; and the results were reliable.” Never use a semicolon before a coordinating conjunction (FANBOYS). Use a comma + conjunction or just the semicolon without “and.”

CORRECT: “The study was inconclusive; however, the methodology was sound.” Semicolon before “however” (a transitional adverb, not a coordinating conjunction). Comma after “however.”

The pattern for transitional adverbs is always: [complete clause] + semicolon + [transitional word] + comma + [complete clause]. Students who remember this exact pattern will correctly punctuate every conjunctive adverb question: “The sample was large; therefore, the results were reliable.” “The hypothesis was untested; nevertheless, the team proceeded.”

CORRECT (with comma): “The study was inconclusive, but the methodology was sound.” INCORRECT (mixed): “The study was inconclusive; but the methodology was sound.”

SEMICOLONS IN LISTS: Use semicolons instead of commas when list items themselves contain commas. INCORRECT: “The team included Ranjit, a biologist, Sara, a chemist, and Miguel, an engineer.” CORRECT: “The team included Ranjit, a biologist; Sara, a chemist; and Miguel, an engineer.”

Semicolons in lists are used exclusively to prevent confusion when list items contain their own commas (as in appositive phrases). Without the semicolons, the reader cannot distinguish where each list item ends. This “super-comma” use of the semicolon appears occasionally on the Digital SAT and is worth recognizing as a legitimate correct answer.

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Rule 6: Apostrophe

THE THREE APOSTROPHE FUNCTIONS AND THEIR RULES:

Apostrophe for Possessives

SINGULAR POSSESSIVE: Add ‘s. “the cat’s toy” (one cat’s toy) “the company’s policy” (one company’s policy) “James’s report” (one person named James) - or “James’ report” (both are acceptable)

PLURAL POSSESSIVE (ending in s): Add apostrophe after the s. “the students’ books” (books belonging to multiple students) “the companies’ policies” (policies of multiple companies)

PLURAL POSSESSIVE (not ending in s): Add ‘s. “the children’s playground” “the women’s team” “the people’s choice”

Apostrophe for Contractions

IT’S vs ITS: “It’s” = “it is” or “it has” (contraction) “Its” = belonging to it (possessive, NO apostrophe)

INCORRECT: “The company announced it’s new policy.” CORRECT: “The company announced its new policy.” (possessive, no apostrophe)

INCORRECT: “Its raining outside.” CORRECT: “It’s raining outside.” (contraction of “it is”)

WHO’S vs WHOSE: “Who’s” = “who is” or “who has” (contraction) “Whose” = belonging to whom (possessive, no apostrophe)

INCORRECT: “The scientist who’s research was published…” CORRECT: “The scientist whose research was published…” (possessive)

INCORRECT: “Whose going to present first?” CORRECT: “Who’s going to present first?” (contraction of “who is”)

“Whose” as possessive can be used for both people and things: “The theory whose foundations were laid in the 19th century…” is correct. “Whose” does not require a human antecedent, despite the “who” in its spelling. For inanimate objects, “whose” is the standard possessive relative pronoun.

THEY’RE / THEIR / THERE: “They’re” = “they are” (contraction) “Their” = belonging to them (possessive) “There” = place or existential marker

INCORRECT: “The researchers published there findings.” CORRECT: “The researchers published their findings.” (possessive)

INCORRECT: “Their going to present tomorrow.” CORRECT: “They’re going to present tomorrow.” (contraction)

Never Use Apostrophe for Plurals

INCORRECT: “The 1990’s were a decade of rapid technological change.” CORRECT: “The 1990s were a decade of rapid technological change.”

INCORRECT: “There were several CEO’s at the conference.” CORRECT: “There were several CEOs at the conference.”

INCORRECT: “She earned two PhD’s.” CORRECT: “She earned two PhDs.”

A quick reference for commonly confused apostrophe cases: “the 1990s” (decade, no apostrophe), “three CEOs” (acronym plural, no apostrophe), “two MDs” (initialism plural, no apostrophe), “the As and Bs on the test” (letter plurals, no apostrophe - though “A’s and B’s” is also acceptable for readability). The Digital SAT tests these plural forms to catch students who reflexively add apostrophes to unusual-looking plurals.

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Rule 7: Parallel Structure

RULE: Items in a list, a comparison, or a paired construction must be in the same grammatical form.

Parallel Structure in Lists

All items in a list must be in the same grammatical form: all nouns, all verb phrases, all infinitives, all gerunds, etc.

INCORRECT: “The program offers classes in writing, how to research, and analysis.” “writing” (gerund) / “how to research” (infinitive phrase) / “analysis” (noun) - three different forms. CORRECT: “The program offers classes in writing, researching, and analysis.” (all gerunds or all nouns) OR: “The program offers classes in how to write, how to research, and how to analyze.” (all infinitive phrases)

INCORRECT: “The job requires attention to detail, to work independently, and problem-solving skills.” CORRECT: “The job requires attention to detail, the ability to work independently, and problem-solving skills.” OR: “The job requires attending to detail, working independently, and solving problems.” (all gerunds)

Parallel Structure in Comparisons

INCORRECT: “She prefers running to swim.” CORRECT: “She prefers running to swimming.” (gerund to gerund)

INCORRECT: “The new policy is more effective than implement the old approach.” CORRECT: “The new policy is more effective than the old approach.” (noun to noun)

Comparison parallelism also appears in sentences using “than” and “as…as”: both sides of the comparison must be grammatically parallel. “Running is more beneficial than to sit all day” breaks parallel structure. “Running is more beneficial than sitting all day” (gerund to gerund) is correct. The structural check: is what follows “than” or “as” the same grammatical form as what precedes it?

Parallel Structure with Correlative Conjunctions

The conjunctions “both…and,” “either…or,” “neither…nor,” “not only…but also,” and “whether…or” require the same grammatical form on each side.

INCORRECT: “The study both documented the problem and offering a solution.” CORRECT: “The study both documented the problem and offered a solution.” (“documented” and “offered” - both past tense verbs)

INCORRECT: “Not only did the results surprise researchers but also the public was astonished.” CORRECT: “Not only did the results surprise researchers, but they also astonished the public.” (parallel structure with consistent subject positioning)

INCORRECT: “She could either take the exam early or she could wait until next semester.” CORRECT: “She could either take the exam early or wait until next semester.” (“take” and “wait” - parallel verb phrases)

A rapid correlative conjunction test: identify what comes immediately after the first conjunction (either/not only/both/neither/whether). That grammatical form must be replicated after the second conjunction (or/but also/and/nor/or). If “either” is followed by a verb, “or” must be followed by a verb of the same form. If “not only” is followed by a noun phrase, “but also” must be followed by a noun phrase.

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Rule 8: Modifier Placement

RULE: A descriptive modifier (word, phrase, or clause) must be placed as close as possible to the noun or pronoun it modifies. Misplaced or dangling modifiers create unclear or illogical sentences.

Misplaced Modifiers

MISPLACED: The modifier is present but positioned too far from the noun it modifies.

Misplaced modifiers are most commonly single words (only, almost, just, even, nearly) that should directly precede the word they modify. The test for a single-word misplaced modifier: read the sentence with the word in each possible position before a noun and identify the position that produces the intended meaning.

INCORRECT: “The committee only reviews proposals submitted on Tuesdays.” CORRECT: “The committee reviews only proposals submitted on Tuesdays.” “Only” should be adjacent to what it modifies (“proposals submitted on Tuesdays”).

INCORRECT: “She almost drove her car to the conference every week.” CORRECT: “She drove her car to the conference almost every week.” “Almost” should modify “every week,” not “drove.” The incorrect version implies she nearly drove but did not; the correct version says she drove on nearly every occasion.

For limiting modifier questions: if the question asks which placement produces a specific meaning, test each answer choice by reading the sentence and asking “what does the modifier now modify?” The choice that produces the intended meaning with the modifier in the correct position is the answer.

For limiting modifier placement questions on the Digital SAT: the answer choices will present the same sentence with the limiting modifier in different positions. Read each choice and ask: what does the modifier modify in this position? The correct position is the one where the modifier modifies the intended element, producing the intended meaning.

INCORRECT: “The researcher examined the patients who had been treated for cancer carefully.” CORRECT: “The researcher carefully examined the patients who had been treated for cancer.” “Carefully” should be adjacent to “examined.”

Adverb placement more broadly: adverbs should be placed as close as possible to the verb, adjective, or other adverb they modify. End-of-sentence adverb placement often creates ambiguity when a relative clause intervenes between the verb and the adverb. Moving the adverb directly before the verb it modifies resolves the ambiguity.

Dangling Modifiers

DANGLING: The modifier has no logical subject in the sentence - the noun it should modify is not present.

INCORRECT: “Walking through the park, the flowers were beautiful.” Who was walking? The sentence implies the flowers were walking. CORRECT: “Walking through the park, I noticed the beautiful flowers.” Now the participial phrase “walking through the park” correctly modifies “I.”

INCORRECT: “After reviewing the data, the conclusion was clear.” Who reviewed the data? The conclusion cannot review data. CORRECT: “After reviewing the data, the researchers reached a clear conclusion.”

INCORRECT: “Having completed the experiment, the results were analyzed.” CORRECT: “Having completed the experiment, the scientists analyzed the results.”

INCORRECT: “To improve writing skills, daily practice is essential.” CORRECT: “To improve writing skills, a student should practice daily.” OR “Improving writing skills requires daily practice.”

The infinitive phrase dangling modifier is a specific subtype to watch for. Any sentence where “To [verb]” opens the sentence, check: can the grammatical subject of the main clause logically perform that action? “Daily practice” cannot improve writing skills - a person can. The fix either provides a human subject (“a student should practice”) or restructures the infinitive as a gerund phrase (“Improving writing skills requires…”).

The SAT tests dangling modifiers by providing sentences where an introductory participial phrase or infinitive phrase does not agree with the grammatical subject of the main clause.

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Rule 9: Sentence Boundaries

Sentence boundary errors come in three types: run-on sentences, comma splices, and sentence fragments.

Run-On Sentences

A run-on occurs when two independent clauses are joined without any punctuation or conjunction.

INCORRECT: “The data was collected over six months the results were published in 2022.” CORRECT OPTIONS:

• “The data was collected over six months. The results were published in 2022.” (period/new sentence)
• “The data was collected over six months; the results were published in 2022.” (semicolon)
• “The data was collected over six months, and the results were published in 2022.” (comma + FANBOYS)
• “The data was collected over six months before the results were published in 2022.” (subordinating conjunction)

Comma Splices

A comma splice joins two independent clauses with only a comma (no conjunction).

INCORRECT: “The results were surprising, the team decided to replicate the study.” The comma alone cannot join two independent clauses. CORRECT OPTIONS:

• “The results were surprising; the team decided to replicate the study.”
• “The results were surprising, so the team decided to replicate the study.”
• “Because the results were surprising, the team decided to replicate the study.”
• “The results were surprising. The team decided to replicate the study.”

COMMON COMMA SPLICE TRAPS: Using transitional adverbs (however, therefore, furthermore, nonetheless) with only a comma. INCORRECT: “The sample size was large, however the results were inconclusive.” CORRECT: “The sample size was large; however, the results were inconclusive.” OR: “The sample size was large. However, the results were inconclusive.”

Sentence Fragments

A fragment is an incomplete sentence - it lacks a subject, a main verb, or both, or it is a dependent clause presented as a sentence.

INCORRECT: “The results, which were published in the leading journal.” This is a noun phrase followed by a relative clause - no main verb for “the results.” CORRECT: “The results were published in the leading journal.” OR: “The results, which were published in the leading journal, showed significant improvement.”

INCORRECT: “Although the study was well-designed.” This is a dependent clause that cannot stand alone. CORRECT: “Although the study was well-designed, the results were inconclusive.”

Subordinators that create dependent clauses (and thus fragments when used alone): although, because, since, when, while, after, before, unless, until, even though, as, if, whenever. Any clause beginning with one of these words cannot stand alone as a sentence - it must be attached to an independent clause.

INCORRECT: “Running for three hours. She finally crossed the finish line.” CORRECT: “Running for three hours, she finally crossed the finish line.” (Participial phrase attached to main clause)

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Rule 10: Idiomatic Expressions and Preposition Usage

The Digital SAT tests a small number of idiomatic preposition choices: cases where the conventional use of English requires a specific preposition after a particular verb, adjective, or noun.

Common Idiomatic Preposition Rules

DIFFERENT FROM (not “different than” in most contexts) INCORRECT: “The new policy is different than the old one.” CORRECT: “The new policy is different from the old one.”

RESPONSIBLE FOR INCORRECT: “The researcher is responsible of analyzing the data.” CORRECT: “The researcher is responsible for analyzing the data.”

INTERESTED IN INCORRECT: “She is interested on learning more about the topic.” CORRECT: “She is interested in learning more about the topic.”

For Digital SAT idiomatic preposition questions, the correct preposition is nearly always the one that sounds natural in standard academic English. Students who read widely in formal English develop this intuition automatically. For those who have not built this intuition, memorizing the ten core pairings listed in Rule 10 covers the majority of idiom questions the test is likely to present.

CAPABLE OF INCORRECT: “The system is capable to process large amounts of data.” CORRECT: “The system is capable of processing large amounts of data.”

CONSISTENT WITH INCORRECT: “The findings are consistent to previous research.” CORRECT: “The findings are consistent with previous research.”

RESULT IN INCORRECT: “The error resulted to significant delays.” CORRECT: “The error resulted in significant delays.”

INDEPENDENT OF / INDEPENDENT FROM CORRECT: “The variables are independent of each other.” (preferred) CORRECT: “The organization operates independently of government oversight.”

SIMILAR TO (not “similar with”) INCORRECT: “The results are similar with those of the previous study.” CORRECT: “The results are similar to those of the previous study.”

Idiomatic Verb Phrases

INCORRECT: “The committee will look into making a decision on the matter.” CORRECT: “The committee will decide on the matter.” (more concise, but also: idiom “look into” = investigate)

INCORRECT: “The researchers aim at developing a new methodology.” CORRECT: “The researchers aim to develop a new methodology.” (“aim to” + infinitive, not “aim at” + gerund)

“Whether” vs “If”

In formal writing, “whether” is preferred when expressing alternatives; “if” is preferred in conditional statements. “The study examined whether the treatment was effective.” (alternatives: effective or not) “If the treatment is effective, it will be widely adopted.” (conditional)

Extended Rule Coverage: Advanced Patterns

The following advanced patterns within each rule category represent the harder examples the Digital SAT uses in higher-difficulty questions.

Advanced Subject-Verb Agreement: Relative Pronoun “who”

RULE: When “who” is the subject of a relative clause, its verb agrees with the antecedent of “who,” not with any other noun in the sentence.

TRICKY PATTERN: “She is one of those students who [are/is] always prepared.” Analysis: “Who” refers to “students” (plural), not to “she” (singular). The verb should be “are.” CORRECT: “She is one of those students who are always prepared.”

This pattern is among the hardest subject-verb agreement questions because the sentence focuses on “she” (singular), making “is” feel natural. The key is that “who” is a relative pronoun whose agreement is determined by its antecedent (“students”), not by the main clause’s subject (“she”). “Who” always refers to the nearest noun it follows, which is “students.”

CONTRASTING PATTERN: “She is the only one of those students who [are/is] always prepared.” Analysis: “Only one” makes the antecedent singular (the one student). The verb should be “is.” CORRECT: “She is the only one of those students who is always prepared.”

The key distinction: “one of those [noun]” → verb matches the plural noun. “The only one of those [noun]” → verb is singular.

ANOTHER TRICKY PATTERN: “The reason why more scientists [are/is] needed…” Analysis: “Reason” is the subject (singular); “scientists” is in a subordinate clause. The verb “are” refers to “scientists,” not to “reason.” So: “The reason why more scientists are needed is clear.”

Advanced Comma Rules: Absolute Phrases

RULE: An absolute phrase (a noun + participle construction that modifies the whole sentence) is set off with commas.

CORRECT: “Her work completed, she left the office.” (“Her work completed” is an absolute phrase modifying the whole situation.)

Absolute phrases are identified by their structure: [noun] + [past or present participle] + any modifiers. “Her work completed” = her (noun) + completed (past participle). “The sun setting” = sun (noun) + setting (present participle). These phrases have their own subject but no main verb - they are subordinate constructions that need to be attached to a main clause with commas.

CORRECT: “The sun setting behind the mountains, the hikers made camp for the night.”

CORRECT: “All things considered, the experiment was a success.”

The SAT occasionally tests whether students can correctly punctuate absolute phrases, which require commas but are not relative clauses and do not use “which.”

Advanced Sentence Boundaries: “However” and Other Conjunctive Adverbs

A COMPLETE LIST OF CONJUNCTIVE ADVERBS requiring semicolons (not commas) when joining independent clauses: accordingly, additionally, also, besides, consequently, finally, furthermore, hence, however, indeed, instead, likewise, meanwhile, moreover, nevertheless, nonetheless, otherwise, still, subsequently, therefore, thus.

INCORRECT: “The experiment failed, consequently the team redesigned their approach.” CORRECT: “The experiment failed; consequently, the team redesigned their approach.” OR: “The experiment failed. Consequently, the team redesigned their approach.”

Students who memorize that “however” and “therefore” always require a semicolon (not a comma) before them when joining independent clauses will correctly handle the most common version of this error.

Advanced Parallel Structure: Gerunds vs Infinitives

Some verbs prefer gerunds; others prefer infinitives; some allow both.

PREFER GERUND (verb + -ing): avoid, consider, deny, enjoy, finish, practice, recommend, suggest. “She enjoys running.” (not “She enjoys to run.”) “He recommends studying every day.” (not “He recommends to study every day.”)

Memory technique for gerund-preferring verbs: RSVP - Remember Stop Vs Prefer. Verbs about remembering/forgetting, stopping/quitting, valuing/preferring often take gerunds. “She remembered locking the door.” “He quit smoking.” “She prefers swimming.”

PREFER INFINITIVE (to + verb): agree, decide, expect, hope, learn, need, plan, want. “She decided to apply.” (not “She decided applying.”) “He plans to finish by Friday.” (not “He plans finishing by Friday.”)

Memory technique for infinitive-preferring verbs: these are typically “future-oriented” verbs (you are committing to do something in the future). Decide, plan, hope, expect, want, need all point toward future action, and they prefer infinitives. Verbs about past or ongoing activities (enjoy, practice, finish, avoid) prefer gerunds.

PARALLEL STRUCTURE WITHIN A SINGLE VERB: If a sentence uses a verb that takes a gerund, all parallel items must be gerunds: INCORRECT: “She enjoys running, to swim, and cycling.” CORRECT: “She enjoys running, swimming, and cycling.”

Advanced Modifier Placement: “Only,” “Almost,” “Even,” “Just”

These limiting modifiers must be placed directly before the word they modify. Misplacing them changes meaning.

“Only I told her the truth.” (No one else told her.) “I only told her the truth.” (I merely told her; I did nothing else.) “I told only her the truth.” (I told no one else.) “I told her only the truth.” (I told nothing but the truth.)

The SAT tests whether students can identify the correct placement of “only” (and similar modifiers) to produce the intended meaning.

A Grammar Strategy for the Digital SAT

Understanding the rules is necessary but not sufficient. Grammar questions require applying rules under time pressure. The following strategy applies to every Standard English Conventions question.

STEP 1: IDENTIFY THE ERROR TYPE FROM THE ANSWER CHOICES Look at what the answer choices change. If the choices all involve different verb forms, the question tests subject-verb agreement or tense. If they involve commas or semicolons, the question tests punctuation. If they involve pronouns, the question tests pronoun agreement or case. Identifying the rule being tested narrows the analysis to the relevant rule.

This step alone eliminates most of the cognitive load: instead of reading an entire sentence and evaluating all possible grammar issues, the student reads the choices, identifies the rule, and applies only that rule. Efficient grammar question strategy starts with the answer choices.

STEP 2: APPLY THE SPECIFIC RULE Once the error type is identified, apply the specific rule for that type:

• Agreement: find the subject, check the verb
• Comma: identify which comma rule applies
• Pronoun: find the antecedent, check agreement
• Parallel: identify the construction, check all items for the same form

STEP 3: ELIMINATE CHOICES THAT VIOLATE THE RULE Usually two or three choices clearly violate the identified rule. Eliminate them.

For most grammar questions, two or three choices will fail the rule test immediately. For example, a subject-verb agreement question with a singular subject will typically present two plural verb choices (clearly wrong) and one or two singular choices. Eliminating the plural choices takes under 10 seconds, leaving only the correct answer or a final decision between near-equivalent options.

STEP 4: SELECT THE MOST CONCISE AND CORRECT REMAINING CHOICE When two choices both seem grammatically correct, the SAT typically prefers the more concise option. Redundancy, wordiness, and unnecessarily complex constructions are often the wrong answer even when grammatically possible.

The concision principle is the tie-breaker when two choices pass the grammar rule test. It also functions as a stand-alone principle for a specific question type: some SEC questions present four grammatically correct options of different lengths and ask which most effectively expresses the information. For these questions, the shortest grammatically correct version that preserves the necessary meaning is the answer.

Common Wrong Answer Traps for Each Rule

Understanding the specific wrong answers the SAT creates helps with recognition during the actual test.

FOR SUBJECT-VERB AGREEMENT: The SAT will create a sentence where the nearest noun to the verb is the wrong number (e.g., “The collection of paintings ARE” - the test hopes you match “are” to “paintings” rather than “is” to “collection”). The wrong answers include the agreement error (matching the nearest noun) and the correct answer (matching the true subject).

Recognizing the trap: whenever a prepositional phrase appears between the subject and verb, the SAT is potentially setting up an agreement trap. The noun in the prepositional phrase is almost never the subject. Training yourself to automatically identify and ignore prepositional phrases is the most important grammar skill for subject-verb agreement questions.

FOR COMMA RULES: The most common trap is presenting a nonessential clause without one of its two commas (usually the closing comma). “The study, which was published in 2020 showed…” is wrong because the closing comma is missing. Another trap: adding a comma before “that” in an essential clause.

For Digital SAT comma questions: when the answer choices differ in comma placement, check first whether the clause is essential or nonessential. Essential clauses (identifying which one) need no commas. Nonessential clauses (adding extra information) need two commas. Any answer choice that has one comma around a nonessential clause is wrong; correct answers either have two commas (both opening and closing) or none (essential clause).

FOR PARALLEL STRUCTURE: Wrong answer choices mix grammatical forms in lists. The pattern is two items in the same form and one that breaks the pattern. The question asks which version of the broken item correctly restores parallelism.

For Digital SAT parallel structure questions: identify items 1 and 2 before looking at the answer choices. They set the required form. Then find the answer choice where item 3 (the underlined item) matches that form. This three-step process (identify form of items 1 and 2, select answer where item 3 matches) is consistently faster and more accurate than trying to evaluate each choice as a complete sentence.

FOR DANGLING MODIFIERS: The wrong answers change something in the main clause but don’t fix the logical mismatch between the introductory phrase and the sentence’s subject. Only the answer that makes the sentence’s grammatical subject the logical performer of the introductory phrase’s action is correct.

For dangling modifier answer evaluation: for each choice, quickly ask “can [the grammatical subject of this answer] [do the action in the introductory phrase]?” If no, eliminate. If yes, keep as a candidate. Usually only one answer passes this test.

FOR APOSTROPHES: Wrong answers often use “it’s” for “its” or vice versa, “who’s” for “whose” or vice versa, or add apostrophes to simple plurals. The test for these is always expansion: “it is” vs possession.

A reliable apostrophe scanning technique: every time an apostrophe appears in an answer choice, expand any contraction mentally and ask if the expansion makes sense. If “it’s” → “it is” makes sense in context, the apostrophe is correct. If “it is” does not make sense and possession is intended, the correct form is “its.” This expansion test takes under two seconds and catches apostrophe errors immediately.

Building Grammar Automaticity

Grammar rules function best when they are automatic - when the correct version sounds right and the incorrect version sounds wrong without deliberate rule application. Building grammar automaticity takes two to three weeks of deliberate exposure:

WEEK 1: RULE STUDY Read through this complete reference. For each rule, write three examples of your own: one showing the error and one showing the correction. Writing examples (not just reading them) encodes the rules more deeply.

WEEK 2: ERROR IDENTIFICATION PRACTICE Take 20 SAT grammar practice sentences per day. For each, identify: (1) which rule is being tested, (2) what the error is, and (3) why the correct answer is correct. The explanation habit is essential - students who can explain why an answer is correct develop the rule-application skill that produces consistent accuracy.

The explanation habit is often skipped by students who just want to check their answers. Resisting this shortcut is important: “I got it wrong because it sounds right but the rule says otherwise” is a complete explanation that encodes the rule. “I got it wrong” with no explanation leaves the mistake unprocessed and likely to recur.

WEEK 3: TIMED PRACTICE Complete full grammar sections under timed conditions. The target for SEC questions is 30 to 45 seconds each. Students who take more than 60 seconds on grammar questions are usually overthinking - most grammar errors are clearly identifiable once the relevant rule is activated.

MAINTENANCE: Grammar rules are among the most durable test skills. Once learned through deliberate practice, they require only periodic reinforcement. Two to three grammar questions per week maintains automaticity through exam day.

The Grammar Hierarchy: What to Master First

Not all grammar rules appear with equal frequency on the Digital SAT. This priority order matches the frequency of appearance:

TIER 1 (Highest frequency - master first):

• Subject-verb agreement (especially intervening phrase patterns)
• Comma rules (especially nonessential clauses and comma splices)
• Pronoun-antecedent agreement (especially indefinite pronouns)
• Sentence boundaries (run-ons and comma splices)

Tier 1 rules appear in approximately 65 to 70 percent of all SEC questions. Students who achieve 90%+ accuracy on Tier 1 rules will perform well on SEC questions even if Tier 2 and 3 rules remain imperfect. Mastering Tier 1 before investing time in Tier 2 produces the highest return per hour of preparation.

TIER 2 (High frequency - master second):

• Semicolons and colons
• Apostrophes (especially it’s/its and possessives)
• Verb tense consistency
• Parallel structure

Tier 2 rules appear in approximately 20 to 25 percent of SEC questions. They are often paired with Tier 1 rules in harder questions that test whether students can correctly apply multiple rules simultaneously. For example, a sentence might have both a subject-verb agreement issue (Tier 1) and a semicolon placement issue (Tier 2); the answer choices force a decision about both.

TIER 3 (Moderate frequency - master third):

• Modifier placement (dangling participials)
• Idiomatic expressions and prepositions

Tier 3 rules appear in 5 to 15 percent of SEC questions. They are typically the hardest question type to recognize because modifier and idiom errors are often contextually subtle. Students who have thoroughly mastered Tier 1 and Tier 2 rules should practice Tier 3 rules in the final week of preparation.

Students who fully master Tier 1 rules before starting Tier 2 will see the largest improvement in the shortest time. The Tier 1 rules account for the majority of SEC questions and should be the preparation priority.

Rule-by-Rule Example Bank: 3+ Additional SAT-Style Examples Per Rule

The following additional examples extend the practice base for each rule category, providing more exposure to the range of difficulty levels on the actual test.

Additional Subject-Verb Agreement Examples

STRAIGHTFORWARD: INCORRECT: “The collection of rare stamps were damaged in the flood.” CORRECT: “The collection of rare stamps was damaged in the flood.” Subject: “collection” (singular). Intervening phrase: “of rare stamps.”

MODERATE: INCORRECT: “The committee, along with several outside experts, have recommended significant changes.” CORRECT: “The committee, along with several outside experts, has recommended significant changes.” “Along with several outside experts” is a prepositional phrase modifying “committee,” not a compound subject with “and.” The subject remains “committee” (singular).

The same rule applies to other phrases that seem to create compound subjects but do not: “together with,” “as well as,” “in addition to,” “accompanied by,” “including,” and “rather than.” All of these are prepositional phrases; they do not create compound subjects. “The president, together with his advisers, has decided to delay the announcement.” Subject: “president” (singular).

TRICKY: INCORRECT: “There is many reasons to reconsider the policy.” CORRECT: “There are many reasons to reconsider the policy.” In inverted sentences beginning with “There,” the subject follows the verb. “Reasons” (plural) is the subject.

Note the contrast: “There is a reason…” (singular) vs “There are reasons…” (plural). “There” itself is never the subject; it is an expletive construction. The subject always appears after the verb in these sentences, and agreement must match that post-verb subject.

VERY TRICKY: INCORRECT: “The number of students who enroll in advanced courses have increased.” CORRECT: “The number of students who enroll in advanced courses has increased.” “The number” is singular. “Of students who enroll in advanced courses” is a modifying phrase. “Has increased” agrees with “the number.” NOTE: “A number of students have enrolled” → “number” acts as a plural collective here (“a number of” = “many”), so “have” is correct.

Additional Pronoun Examples

STRAIGHTFORWARD: INCORRECT: “Each of the participants submitted their consent form.” CORRECT: “Each of the participants submitted his or her consent form.” OR “All participants submitted their consent forms.” “Each” is singular. “Their” is plural.

MODERATE: INCORRECT: “The committee announced that they would delay the vote.” CORRECT: “The committee announced that it would delay the vote.” (singular/collective) OR “The committee members announced that they would delay the vote.” (explicitly plural)

TRICKY: INCORRECT: “Between you and I, the experiment was poorly designed.” CORRECT: “Between you and me, the experiment was poorly designed.” “Between” is a preposition; its objects must be in the objective case (“me,” not “I”).

The “between you and I” error is one of the most common spoken English mistakes because it sounds formal or educated to many speakers. On the Digital SAT, this hypercorrection is tested: students who know “I” sounds more formal may incorrectly select “between you and I.” The rule is clear: prepositions always take objective pronouns. Any “between ___ and I” or “with ___ and I” is wrong.

VERY TRICKY - “Who vs Whom”: “She is the researcher [who/whom] the committee selected for the award.” Test: substitute “he” or “him.” “The committee selected him.” → him → whom. CORRECT: “She is the researcher whom the committee selected for the award.”

Additional Verb Tense Examples

STRAIGHTFORWARD: INCORRECT: “The engineers designed the bridge and test its load capacity.” CORRECT: “The engineers designed the bridge and tested its load capacity.” Both actions are in the past.

MODERATE: INCORRECT: “By the time the researchers publish their findings, they will have analyzed the data for three years.” CORRECT: This sentence is actually CORRECT as written. “Will have analyzed” (future perfect) is correct for an action that will be completed before a future reference point.

TRICKY (sequence of tenses): INCORRECT: “The professor explained that evolution was occurring over millions of years.” CORRECT: “The professor explained that evolution occurs over millions of years.” When reporting a fact that is generally true (not just true in the past), use present tense in the subordinate clause even when the reporting verb is past.

Additional Punctuation Examples

SEMICOLONS IN PRACTICE: INCORRECT: “The data was incomplete, however, the team proceeded with the analysis.” CORRECT: “The data was incomplete; however, the team proceeded with the analysis.” “However” as a conjunctive adverb joining independent clauses requires a semicolon before it.

INCORRECT: “The team worked diligently; and produced excellent results.” CORRECT: “The team worked diligently and produced excellent results.” Semicolon before “and” is wrong. No comma needed either since “produced excellent results” is not an independent clause.

COLONS IN PRACTICE: INCORRECT: “The study examined: temperature, humidity, and pressure.” CORRECT: “The study examined temperature, humidity, and pressure.” Never use a colon directly after a verb.

CORRECT: “The study examined three environmental variables: temperature, humidity, and pressure.” “Three environmental variables” completes the clause; colon correctly introduces the list.

APOSTROPHES IN PRACTICE: INCORRECT: “The teams performance was outstanding.” CORRECT: “The team’s performance was outstanding.” (singular possessive)

INCORRECT: “Both teams’ performance’s were outstanding.” CORRECT: “Both teams’ performances were outstanding.” “Teams’” = plural possessive (correct). “Performances” = plural noun (no apostrophe needed).

Additional Parallel Structure Examples

LIST PARALLELISM: INCORRECT: “The course covers grammar, how to write clearly, and rhetorical analysis.” CORRECT: “The course covers grammar, clear writing, and rhetorical analysis.” (all nouns) OR: “The course covers how to apply grammar, how to write clearly, and how to conduct rhetorical analysis.” (all infinitive phrases)

COMPARISON PARALLELISM: INCORRECT: “Attending class is more beneficial than to study alone.” CORRECT: “Attending class is more beneficial than studying alone.” (gerund to gerund)

CORRELATIVE CONJUNCTION PARALLELISM: INCORRECT: “She not only revised the draft but also the sources were updated.” CORRECT: “She not only revised the draft but also updated the sources.” (“revised” and “updated” - both past tense verbs as the predicate verb phrases)

Correlative conjunction parallel structure is one of the most consistently tested patterns in this category. The rule: whatever grammatical form appears between “not only” and “but also,” the same grammatical form must appear after “but also.” Verb phrases match verb phrases. Noun phrases match noun phrases. Clauses match clauses.

Additional Modifier Examples

MISPLACED MODIFIER: INCORRECT: “She nearly drove a hundred miles before stopping for gas.” CORRECT: “She drove nearly a hundred miles before stopping for gas.” “Nearly” should modify “a hundred miles,” not “drove.” Incorrect placement suggests she almost started driving; correct placement shows the distance was close to a hundred miles.

DANGLING MODIFIER: INCORRECT: “Determined to complete the project, the deadline was extended.” Who was determined? The deadline cannot be determined. CORRECT: “Determined to complete the project, the team requested a deadline extension.” OR: “Because the team was determined to complete the project, the deadline was extended.”

The second correction (“Because the team was determined…”) restructures the sentence to eliminate the dangling modifier by converting the participial phrase into a dependent clause. This is a valid alternative correction and may appear as a correct answer choice on the Digital SAT.

DANGLING INFINITIVE: INCORRECT: “To succeed in the exam, extensive practice is necessary.” CORRECT: “To succeed in the exam, students need extensive practice.” The infinitive phrase implies a human actor; “students” provides it.

Additional Sentence Boundary Examples

COMMA SPLICE: INCORRECT: “The weather was perfect for the experiment, the team set up their equipment immediately.” CORRECT: “The weather was perfect for the experiment, so the team set up their equipment immediately.” (comma + FANBOYS) OR: “The weather was perfect for the experiment; the team set up their equipment immediately.” (semicolon)

RUN-ON: INCORRECT: “The results exceeded expectations the research team celebrated.” CORRECT: “The results exceeded expectations. The research team celebrated.” OR: “The results exceeded expectations, and the research team celebrated.”

FRAGMENT: INCORRECT: “The significant findings of the three-year study.” CORRECT: “The significant findings of the three-year study were published last month.” OR: “The three-year study produced significant findings.”

Grammar Rules Quick Reference Card

The following condensed reference covers the core rule for each of the ten categories in one or two sentences.

RULE 1 - SUBJECT-VERB AGREEMENT: Find the grammatical subject (ignore intervening phrases and relative clauses). Match the verb to the subject’s number. With “or/nor,” agree with the closer subject. Collective nouns (team, committee) are singular when acting as a unit. Indefinite pronouns listed as always-singular take singular verbs regardless of context.

RULE 2 - PRONOUN-ANTECEDENT AGREEMENT: A pronoun must agree in number with its antecedent and have a clear, unambiguous reference. Indefinite pronouns (each, every, either, neither, everyone) are singular. Possessive pronouns (its, whose, their, your) never take apostrophes.

RULE 3 - VERB TENSE CONSISTENCY: Maintain consistent tense unless events genuinely occurred at different times. Literary present tense is used when describing a text’s current content. Past perfect (“had done”) describes actions completed before another past action. Future perfect (“will have done”) describes actions completed before a future reference point.

RULE 4 - COMMA RULES: After introductory elements (comma required). Around nonessential “which” clauses (two commas). In lists (serial comma before final “and/or”). Before FANBOYS when joining two complete independent clauses (comma + conjunction). Do NOT add comma before FANBOYS joining two phrases (only one subject present).

RULE 5 - COLON AND SEMICOLON: Colon follows a complete clause and introduces a list or explanation. Never use a colon after a verb. Semicolon joins two independent clauses; never precede FANBOYS with a semicolon. Conjunctive adverbs (however, therefore) require a semicolon before them and a comma after.

RULE 6 - APOSTROPHE: Possessives get apostrophes; plurals do not. “It’s” = “it is” or “it has.” “Its” = belonging to it (no apostrophe). “Who’s” = “who is” or “who has.” “Whose” = belonging to whom (no apostrophe). Personal possessive pronouns (its, whose, their, your, our, hers, his) NEVER take apostrophes.

RULE 7 - PARALLEL STRUCTURE: All items in a list or paired construction must be in the same grammatical form. Correlative conjunctions (both…and, either…or, not only…but also, neither…nor) require matching forms on each side. Test: read each item with the list’s lead-in. All items should sound grammatically consistent.

RULE 8 - MODIFIER PLACEMENT: Place modifiers next to what they modify. Introductory participial phrases must have a logical referent as the sentence’s grammatical subject. Limiting modifiers (only, almost, even, just, nearly) must directly precede the element they modify. Test: who performs the action in the introductory phrase? That person must be the sentence’s grammatical subject.

RULE 9 - SENTENCE BOUNDARIES: Two independent clauses cannot be joined by only a comma (comma splice). Two independent clauses with no punctuation between them is a run-on. A clause without a subject or complete verb is a fragment. All three errors are fixed by using appropriate punctuation (period, semicolon) or by restructuring with a conjunction.

RULE 10 - IDIOMATIC EXPRESSIONS: Specific verbs and adjectives pair with specific prepositions. Core pairings: “different from,” “responsible for,” “interested in,” “capable of,” “consistent with,” “similar to,” “result in.” When in doubt, test whether the preposition sounds like standard academic English.

The Role of Concision in SEC Questions

Beyond rule-based correctness, the Digital SAT also tests writing quality through concision: the preference for clear, direct expression over wordy or redundant alternatives.

REDUNDANCY EXAMPLES: INCORRECT: “The final outcome at the end of the experiment was inconclusive.” CORRECT: “The final outcome of the experiment was inconclusive.” OR “The experiment’s outcome was inconclusive.” “Final” and “at the end” are redundant - an outcome is by definition final.

INCORRECT: “Each individual student must submit their own personal essay.” CORRECT: “Each student must submit a personal essay.” “Individual” adds nothing to “each”; “their own” is redundant with “personal.”

UNNECESSARY PREPOSITIONS AND HEDGES: INCORRECT: “The reason why the results were unexpected is due to the fact that the sample was biased.” CORRECT: “The results were unexpected because the sample was biased.” “The reason why… is due to the fact that” can always be simplified to “because.”

Another frequently tested redundancy: “The reason is because…” is itself redundant. “The reason” already implies a causal explanation; “because” states causation again. Correct: “The reason is that…” or simply restructure: “The results were unexpected because…”

Other common redundancy patterns on the Digital SAT: “In spite of the fact that…” → “Although” “At this point in time” → “Now” “Prior to the beginning of” → “Before” “Due to the fact that” → “Because” “In the event that” → “If” These simplifications are nearly always correct on Digital SAT concision questions.

INCORRECT: “In terms of the question of whether…” CORRECT: “Whether…” “In terms of the question of whether” is pure padding.

PASSIVE VS ACTIVE VOICE: While the SAT does not always penalize passive voice, it often presents active voice as the preferred (correct) answer when a choice exists. When answer choices include an active and a passive version of the same content, the active version is typically preferred.

Passive voice is acceptable when the actor is unknown, unimportant, or when the receiver of the action is more important than the actor: “The samples were collected over three weeks.” Here the identity of the collector is less important than the samples themselves. Passive is grammatically correct in this context. The SAT only penalizes passive when an active alternative that is equally clear and more concise is available.

INCORRECT (if active is available): “The data was analyzed by the team.” CORRECT (preferred): “The team analyzed the data.”

When evaluating competing answer choices in SEC questions where all options are grammatically correct, prefer: (1) the most concise option, (2) the clearest expression, (3) the active over the passive voice, and (4) the option without unnecessary hedging or redundancy.

Integrating Grammar Practice with Reading Practice

Standard English Conventions questions appear in the same section as reading comprehension questions on the Digital SAT. This integration creates a practical challenge: students must shift between two different types of attention - meta-reading for construction (comprehension questions) and rule-application for correctness (grammar questions).

Building fluency with both skill sets reduces the cognitive load of shifting between them. Students who have automated their grammar rule application (so that errors “sound wrong” rather than requiring deliberate analysis) can handle SEC questions quickly and reserve their analytical attention for harder reading questions.

The automation test: read a grammar error and ask “does this sound wrong?” If the error jumps out without deliberate rule application, grammar automaticity is developing. If you need to consciously apply rules to notice errors, more practice is needed. The goal is grammar intuition backed by rule knowledge - the rules explain why something sounds wrong, but the “wrongness” should be perceptible before the explanation.

Building grammar intuition takes longer than memorizing rules but produces more durable accuracy. A student who has internalized grammar rules will perform consistently even under time pressure; a student who remembers rules but has not internalized them may forget or misapply rules when rushing. The two-to-three week practice protocol in this article is designed to develop both the explicit rule knowledge and the implicit intuition.

This grammar intuition develops through high-volume exposure to correct English combined with deliberate attention to the specific error patterns the SAT exploits. Students who read widely in formal, edited English build a natural sense of standard usage that complements the explicit rule knowledge this article provides.

For practical SAT preparation, the combination of explicit rule study (this article) and practice with real Digital SAT grammar questions (using the practice resources linked above) builds both levels of the grammar skill hierarchy: explicit rule knowledge and implicit error recognition. Two to three weeks of this combined practice typically produces a significant improvement in SEC section accuracy.

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Frequently Asked Questions

Q1: How many Standard English Conventions questions appear on the Digital SAT?

Approximately 20-26 questions across both modules of the Reading and Writing section, making them roughly half of the total section questions. Because conventions questions test rule-based correctness, they have the highest accuracy ceiling of any question type: a student who knows all the rules and applies them correctly will answer all conventions questions correctly. This rule-based nature makes dedicated conventions preparation extremely high-value.

For comparison: reading comprehension questions have significant subjective interpretation elements and an accuracy ceiling around 90-95% even for well-prepared students. Grammar questions have a 100% accuracy ceiling for students who know the rules, making SEC preparation one of the most efficient score investments in the entire test.

Q2: What is the most frequently tested grammar rule on the Digital SAT?

Subject-verb agreement (Rule 1) is tested most frequently, particularly the pattern of intervening phrases between subject and verb. The prepositional phrase trap (“The box of chocolates [are/is]”) is the single most exploited agreement pattern. Students who master the three-step process (1. find the verb, 2. ask “what is the subject?” ignoring intervening phrases, 3. match the verb to the subject) will correctly answer the majority of subject-verb agreement questions.

Closely behind subject-verb agreement in frequency: comma rules (particularly nonessential clauses and comma splices) and pronoun-antecedent agreement. These three rule categories together account for approximately 60 to 70 percent of all SEC question errors.

Q3: What is the fastest way to identify a comma splice?

Read the two clauses joined by a comma and ask: “Is each side a complete sentence?” If yes, a comma alone cannot join them. Use a period (new sentence), semicolon, or comma + coordinating conjunction instead. The transition word test also works: if a comma precedes “however,” “therefore,” “furthermore,” or “nevertheless,” it is almost certainly a comma splice. The fix is to replace the comma with a semicolon (followed by the transition word and a comma) or to begin a new sentence.

A fast scan technique: when a comma appears in a sentence, check what immediately follows it. If it is a transitional adverb (“however,” “therefore,” etc.) and the preceding text is a complete sentence, you have a comma splice. This scan takes under three seconds per comma and catches the most common comma splice pattern.

Q4: How do I identify a dangling modifier?

Read the introductory participial or infinitive phrase, then ask: “Who is performing the action in this phrase?” Then check if that person or thing is the grammatical subject of the main clause. If the subject of the main clause cannot logically perform the action in the introductory phrase, the modifier is dangling. Fix: rewrite the main clause so the correct logical subject is the grammatical subject.

For Digital SAT dangling modifier questions, the answer choices present different versions of the main clause. The correct answer is the version that makes the main clause’s subject the logical actor of the introductory phrase. Eliminate any choice where the grammatical subject cannot logically perform the action in the phrase.

Q5: What is the “which/that” distinction for commas?

“That” introduces essential information (no commas). “Which” introduces nonessential information (commas on both sides). The test: remove the clause and ask if the sentence loses essential identifying information. If yes, it is essential (use “that,” no commas). If no, it is nonessential (use “which,” with commas). This distinction is consistently tested on the Digital SAT.

A memory device: “that” = identifies (specifies which one); “which” = elaborates (adds information about one already identified). “The report that was submitted yesterday” identifies which report. “The annual report, which was submitted yesterday,” adds information about a report already identified.

Q6: What is the rule for “it’s” vs “its”?

“It’s” is a contraction of “it is” or “it has.” “Its” is a possessive pronoun meaning “belonging to it.” The test: substitute “it is” into the sentence. If the sentence still makes sense with “it is,” use “it’s.” If “it is” does not make sense, use “its.” The same test applies to “who’s/whose” and “they’re/their.” Contractions can be tested by expanding them; possessives cannot be expanded.

This one rule about apostrophes - that possessive pronouns (its, whose, their, your) never take apostrophes - eliminates the majority of apostrophe errors. The pattern: personal pronouns (it, who, they, you) form their possessives WITHOUT apostrophes. Only nouns and indefinite pronouns form possessives with apostrophes.

Q7: When is a semicolon correct vs incorrect?

A semicolon correctly joins two complete, related independent clauses. It is incorrect before a coordinating conjunction (FANBOYS: for, and, nor, but, or, yet, so). It is also incorrect when one side is not a complete clause. The reliable semicolon test: can each side stand as a complete sentence on its own? If both sides are complete sentences and no coordinating conjunction follows the semicolon, the semicolon is correct.

A common wrong answer for semicolon questions: using a semicolon before “and,” “but,” or “so.” The SAT often presents “and” or “but” as an answer choice after a semicolon. This is always wrong. Semicolons replace conjunctions; they do not precede them.

Q8: What is the parallel structure test?

For any list or paired construction, identify the grammatical form of each item. If one item is a gerund, all should be gerunds. If one is a noun phrase, all should be noun phrases. The test: read the items back to back with “and” between each. If the pattern sounds grammatically inconsistent (“writing, to research, and analysis”), the structure is not parallel. Correct all items to the same form.

A quick identification technique for Digital SAT parallel structure questions: the answer choices will typically all contain the same first two list items and only vary the third. The correct answer makes all three items the same grammatical form. Identify the form of items 1 and 2, then select the answer that makes item 3 match that form.

Q9: What is the rule for apostrophes in possessives vs plurals?

Apostrophes are used for possessives and contractions only, never for plurals. To form a possessive: singular noun → add ‘s (dog’s bone); plural noun ending in s → add apostrophe after s (dogs’ bones); plural noun not ending in s → add ‘s (children’s books). For plurals: simply add s or es with no apostrophe (dogs, boxes, CEOs, the 1990s).

A common exam trap: possessive apostrophes for words ending in s. “James’s book” or “James’ book” - both are acceptable. “The class’s performance” or “the class’ performance” - both can be correct. The SAT typically uses the -‘s form for singular nouns ending in s. When an apostrophe question involves a word ending in s, check whether the intended meaning is possessive (needs apostrophe) or plural (no apostrophe).

Q10: How do colons and semicolons differ in function?

A colon introduces something: it connects a complete clause to an explanation, list, or elaboration that follows. A semicolon joins: it connects two complete, related independent clauses as equals. Memory device: colon = announces what follows; semicolon = connects two equal partners.

A practical test for colon vs semicolon: read what comes before the mark. If what follows explains, lists, or elaborates on a complete claim made before the mark, use a colon. If what follows is a new independent statement related to but separate from the first, use a semicolon.

Q11: What is subject-verb agreement with “none”?

“None” can be singular or plural depending on context. “None of the information was useful” (information = uncountable/singular → “was”). “None of the reports were submitted” (reports = countable/plural → “were”). The key is the noun in the prepositional phrase: if it is uncountable, use singular; if it is countable plural, use plural. The SAT most often expects singular (“none… was/is”) but context determines the correct choice.

For practical purposes on the Digital SAT: if a “none” question appears and both “was/is” and “were/are” seem defensible, identify whether the noun in the “of” phrase is countable or uncountable. Uncountable nouns (information, data, research, evidence, water, air) take singular verbs. Countable plural nouns (reports, students, findings, experiments) take plural verbs.

Q12: What are the most common idiomatic preposition errors?

The most frequently tested: “different from” (not “different than”), “responsible for” (not “responsible of”), “interested in” (not “interested on”), “capable of” (not “capable to”), “consistent with” (not “consistent to”), and “similar to” (not “similar with”). For preposition questions, the test is whether the combination sounds like standard English. If a preposition sounds wrong with a particular verb or adjective, it probably is.

For Digital SAT idiomatic preposition questions: the answer choices will present the same phrase with different prepositions. Eliminate choices where the preposition is clearly non-standard (“different on,” “responsible about,” “interested at”). The correct preposition is the one that matches standard academic English usage. When in doubt, eliminating clearly wrong prepositions (usually two or three choices) typically leaves the correct answer.

Q13: What is the difference between a run-on and a comma splice?

A run-on is two independent clauses joined with no punctuation. A comma splice is two independent clauses joined by a comma alone. Both are errors; both are fixed by adding appropriate punctuation (period, semicolon) or by adding a coordinating conjunction. The distinction between them is the type of error: run-on = missing punctuation entirely; comma splice = punctuation present but insufficient (comma alone is not enough).

For practical Digital SAT purposes, the distinction between run-on and comma splice matters less than the ability to recognize when two independent clauses are present and need appropriate connecting punctuation. The answer choices will always offer a correctly punctuated version; identifying that a sentence boundary error exists is the first step, then selecting the correctly fixed version from the choices.

Q14: What are the FANBOYS conjunctions and when do they require a comma?

FANBOYS: For, And, Nor, But, Or, Yet, So. These seven coordinating conjunctions require a comma before them when they join two complete independent clauses. No comma is needed when a FANBOYS conjunction joins two phrases (not complete clauses): “She studied and passed” (no comma - “passed” is a phrase, not an independent clause with its own subject).

A quick test: can the part after the FANBOYS conjunction stand as a complete sentence? “She studied [all weekend] and [she] passed the exam.” → “She passed the exam” is a complete sentence → comma before “and.” “She studied [all weekend] and passed the exam.” → “Passed the exam” is not a complete sentence (no subject) → no comma.

Q15: How do I identify which word in a sentence is the subject for agreement purposes?

Find the main verb first. Then ask “who or what [verb]?” - the answer is the subject. Ignore everything between the subject and verb (prepositional phrases, relative clauses, appositive phrases). A reliable technique: mentally bracket off all intervening material (everything between commas, or between the subject and verb) and read the subject and verb together. If they agree with intervening material removed, the sentence is likely correct.

A physical technique for practice: literally cross out all prepositional phrases and relative clauses on the paper. What remains should be the core sentence structure (subject + verb + object). If the subject and verb agree in the stripped-down version, they are likely correct in the full sentence. This technique takes 10 to 15 seconds but catches most subject-verb agreement errors during early practice.

Q16: What is the rule for verb tense in formal writing about texts and studies?

When writing about the content of a text, study, or report that currently exists, use the present tense: “The study argues that…”, “The report indicates…”, “The author describes…” This is the literary present convention. When describing when the study was conducted, use past tense: “The study was conducted in 2020.” The SAT tests tense consistency within this context - shifting between present tense when discussing content and past tense when discussing timing is correct; inconsistently shifting within descriptions of content is not.

For the Digital SAT specifically: when a grammar passage is discussing a historical text or ongoing research, all sentences describing what the text says or what the research shows should use present tense. Switching to past tense for these content descriptions is the specific tense error the SAT creates. The answer that uses present tense for content description is typically correct.

Q17: What modifier placement error appears most on the Digital SAT?

The dangling participial phrase is most common. The Digital SAT often presents sentences where an introductory phrase beginning with a present participle (“-ing” verb) or past participle has an illogical subject. The question asks which version of the main clause correctly provides the logical actor for the introductory phrase. The correct answer makes the sentence’s grammatical subject the same person or thing performing the action in the introductory phrase.

A quick diagnostic for dangling modifier questions: read the introductory phrase and ask “who is [verb]-ing?” Then check: is that person the grammatical subject of the sentence? If not, find the answer choice that makes the correct person the subject. This diagnostic takes under 10 seconds and directly identifies the correct answer.

Q18: How many commas does a nonessential clause need?

Two - one before the nonessential clause begins and one after it ends. Missing the closing comma is a common error. If a sentence uses a comma to open a nonessential clause but no comma to close it, the punctuation is incorrect: “The report, which was published in 2020 showed significant results.” is wrong. Correct: “The report, which was published in 2020, showed significant results.”

For Digital SAT answer choice evaluation: when comparing choices that differ only in comma placement around a nonessential clause, check for symmetry - both a comma before and a comma after. A choice with only one comma around a nonessential clause is wrong. The symmetric two-comma version is correct.

Q19: Is there a quick way to check parallel structure?

Yes: read each item in the list with the list’s lead-in. For “The job requires [item 1], [item 2], and [item 3],” try “The job requires [item 1],” “The job requires [item 2],” and “The job requires [item 3].” If all three sound grammatically consistent with the lead-in, the structure is parallel. If one sounds grammatically different (a different word form or construction), it breaks parallel structure and needs correction.

For Digital SAT parallel structure questions: the answer choices typically present the same full list with only the third (or last) item changed between options. Identify the form of items 1 and 2, then find the answer where item 3 matches. This makes parallel structure questions among the fastest to answer once the technique is learned: look at items 1 and 2, then find the answer where item 3 has the same form.

Q20: What is the single most important habit for SEC questions?

Finding the grammatical subject before evaluating verb agreement, pronoun reference, or other subject-dependent rules. Many SEC errors are created by confusing the grammatical subject with a nearby noun. Students who habitually locate the subject first and then evaluate agreement, pronoun clarity, and tense consistency relative to that subject resolve the majority of SEC questions efficiently and accurately.

The subject-first habit also trains the eye to spot intervening phrases between subject and verb, which is the SAT’s most frequently used exploitation of subject-verb agreement. When the eye automatically skips over intervening material to find the true subject, the most common grammar error becomes immediately visible rather than hidden. Subject identification is the one habit that produces the most grammar improvement per unit of practice time.