SAT Grammar Rules: Every Rule Tested on the Digital SAT

Grammar questions are the most reliable source of points on the entire SAT Reading and Writing section. Unlike reading comprehension questions, where the correct answer sometimes requires nuanced interpretation, grammar questions have one objectively correct answer based on fixed, learnable rules. If you know the rules, you get the points. No ambiguity, no subjective judgment, no interpretive gray area. This makes grammar the single highest-return area of study for students looking to improve their Reading and Writing score efficiently.

The SAT tests grammar through its Standard English Conventions question category, which accounts for approximately 11 to 13 of the 54 total Reading and Writing questions. These questions present a passage with a blank or underlined portion and ask you to select the answer choice that correctly applies the conventions of Standard English. The grammar rules tested are finite, predictable, and learnable within a few weeks of focused study.

SAT Grammar Rules Complete Guide

This guide covers every grammar rule tested on the Digital SAT with exhaustive detail. For each rule, you will find the underlying grammatical principle, correct and incorrect examples in SAT-style sentence contexts, the specific way the College Board tests the rule, common mistakes students make, and a quick identification strategy for recognizing what rule is being tested. A comprehensive rapid-review reference table at the end summarizes every rule for last-minute review before the test.

Table of Contents

Why Grammar Is the Fastest Path to Score Improvement

Grammar questions have three characteristics that make them uniquely valuable for score improvement.

First, they are objective. There is exactly one grammatically correct answer among the four choices. Unlike reading comprehension questions where two answers might seem equally plausible, grammar questions reduce to rule application. If you know the rule, you know the answer.

Second, the rules are finite. The SAT tests approximately 25 to 30 distinct grammar rules. You can learn all of them within two to three weeks of focused study. Compare this to reading comprehension, where improvement requires building skills over months through extensive reading practice.

Third, grammar questions are among the fastest to answer on the test. Once you can identify the rule being tested, the correct answer is often apparent within 10 to 15 seconds. This speed gives you extra time for the slower, more interpretive reading comprehension questions.

For students scoring in the 500 to 600 range on Reading and Writing, mastering grammar rules is typically worth 40 to 70 points of improvement. For students scoring below 500, it can be worth even more. No other single area of study produces such predictable, efficient score gains.

How Grammar Questions Appear on the Digital SAT

Grammar questions on the Digital SAT present a short passage (typically 25 to 100 words) with a blank or underlined portion. Four answer choices offer different ways to fill the blank or replace the underlined text. One choice is grammatically correct; the other three each violate at least one grammar rule.

The passage provides context that is essential for answering the question. You must read the full passage (not just the sentence containing the blank) to determine the correct tense, the correct pronoun reference, or the correct punctuation. Skipping the context is a common mistake that leads to wrong answers on tense consistency and pronoun reference questions.

The questions are organized within the Standard English Conventions category, which means you will encounter them grouped together during each module rather than scattered randomly among other question types. This grouping allows you to stay in “grammar mode” for a block of questions, which improves speed and accuracy.

Rule 1: Subject-Verb Agreement

The Principle: A singular subject takes a singular verb; a plural subject takes a plural verb.

Why It Is Tricky on the SAT: The SAT places long phrases, clauses, or parenthetical expressions between the subject and the verb, making it difficult to identify the actual subject.

Correct: “The collection of rare books is stored in the archive.” (Subject: “collection” is singular, so the verb is “is.”)

Incorrect: “The collection of rare books are stored in the archive.” (The plural “books” is closer to the verb but is not the subject; it is the object of the preposition “of.”)

SAT Testing Pattern: The SAT creates distance between the subject and verb by inserting prepositional phrases (“of rare books”), relative clauses (“which were discovered last century”), or parenthetical information set off by commas. Your job is to mentally strip away these insertions and connect the subject directly to the verb.

Quick Identification Strategy: When you see a verb in the underlined portion, immediately identify the subject. Ignore everything between the subject and the verb. Ask: is the subject singular or plural? Then check that the verb matches.

Tricky Subject-Verb Agreement Cases

Compound subjects with “and”: Two subjects joined by “and” are usually plural. “The CEO and the CFO are reviewing the report.” Exception: when the two subjects refer to a single entity. “Peanut butter and jelly is my favorite sandwich.” (One thing, singular verb.)

Subjects joined by “or” or “nor”: The verb agrees with the nearer subject. “Neither the manager nor the employees were informed.” (Plural “employees” is nearer, so plural verb.) “Neither the employees nor the manager was informed.” (Singular “manager” is nearer, so singular verb.)

Inverted sentences: When the subject follows the verb (often beginning with “there” or “here”), identify the real subject. “There are three reasons for the delay.” (Subject: “reasons” is plural.) “Here is the document you requested.” (Subject: “document” is singular.)

Indefinite pronouns: Some are always singular (everyone, each, nobody, anybody, somebody, everything, nothing, either, neither). Some are always plural (both, few, many, several). Some can be either singular or plural depending on context (some, any, none, all, most). “Each of the students has submitted the assignment.” (“Each” is singular.) “Several of the students have submitted the assignment.” (“Several” is plural.) “Some of the water has evaporated.” (“Some” refers to “water,” which is uncountable/singular.) “Some of the books have been returned.” (“Some” refers to “books,” which is plural.)

Collective nouns: Words like “team,” “committee,” “group,” “audience,” and “family” are typically singular in American English when the group acts as a unit. “The committee has reached a decision.” If the members act individually, the noun can be treated as plural, but the SAT almost always treats collective nouns as singular.

Subject-Verb Agreement: SAT-Style Worked Examples

Worked Example 1:

“The implications of the new policy _____ still being debated by lawmakers.”

A) is B) are C) was D) has been

The subject is “implications” (plural), not “policy” (the object of the preposition “of”). The verb must be plural and match the present progressive tense indicated by “still being debated.” Answer: B (are).

Worked Example 2:

“Each of the proposals submitted by the research teams _____ a detailed budget.”

A) include B) includes C) are including D) have included

The subject is “Each” (always singular, regardless of what follows in the prepositional phrase). The verb must be singular. Answer: B (includes).

Worked Example 3:

“The data collected from surveys conducted across multiple regions _____ a consistent pattern of consumer behavior.”

A) reveals B) reveal C) are revealing D) have been revealing

The subject is “data.” In formal Standard English as tested on the SAT, “data” can be treated as either singular or plural, but the SAT typically pairs it with a singular verb when it refers to a body of information. However, the key is to identify that “data” is the subject, not “surveys” or “regions.” Given the context of a single pattern, the singular verb “reveals” fits best. Answer: A (reveals).

Worked Example 4:

“Neither the lead researcher nor her assistants _____ able to replicate the original results.”

A) was B) were C) is D) has been

With “neither…nor,” the verb agrees with the nearer subject. “Assistants” is plural and is nearer to the verb. Answer: B (were).

Worked Example 5:

“There _____ several compelling reasons to reconsider the committee’s initial recommendation.”

A) is B) are C) was D) has been

In this inverted sentence, the subject follows the verb. The subject is “reasons” (plural). Answer: B (are).

Rule 2: Pronoun-Antecedent Agreement

The Principle: A pronoun must agree in number (singular or plural) with its antecedent (the noun it refers to).

Correct: “Each student must bring his or her laptop to class.” (“Each” is singular, so the pronoun is singular.)

Incorrect: “Each student must bring their laptop to class.” (In formal Standard English as tested on the SAT, “each” is singular and requires a singular pronoun.)

SAT Testing Pattern: The SAT tests this rule by presenting a sentence with a pronoun that must agree with a specific antecedent. The answer choices offer different pronoun forms, and only one matches the antecedent in number.

Key Antecedents That Are Singular:

Everyone, everybody, everything, each, every, anyone, anybody, anything, someone, somebody, something, no one, nobody, nothing, either, neither. These all take singular pronouns.

“Everyone in the office submitted his or her report on time.”

“Neither of the proposals met its projected goals.”

Key Antecedents That Are Plural:

Both, few, many, several. These take plural pronouns.

“Both of the researchers published their findings.”

“Several of the participants shared their experiences.”

Quick Identification Strategy: When you see a pronoun in the answer choices that differs in number across the options (e.g., “his or her” vs. “their”), look at the antecedent. Determine whether the antecedent is singular or plural. Choose the pronoun that matches.

Rule 3: Pronoun Clarity (Ambiguous Reference)

The Principle: A pronoun must clearly refer to a specific antecedent. If a pronoun could refer to more than one noun, the sentence is ambiguous and must be revised.

Ambiguous: “When Sarah met Maria, she was nervous.” (Who was nervous? “She” could refer to either Sarah or Maria.)

Clear: “When Sarah met Maria, Sarah was nervous.” (Replacing the ambiguous pronoun with the specific name eliminates the ambiguity.)

SAT Testing Pattern: The SAT presents sentences where a pronoun has two or more possible antecedents. The correct answer replaces the ambiguous pronoun with the specific noun or restructures the sentence to make the reference clear. The incorrect answers retain the ambiguous pronoun.

Another Common Pattern: Vague pronoun reference, where a pronoun like “this,” “that,” “it,” or “which” refers to an entire idea rather than a specific noun. “The experiment was poorly designed and the data was insufficient. This led to the rejection of the paper.” (“This” vaguely refers to the entire situation.) The SAT prefers: “This combination of flaws led to the rejection of the paper.” (Replacing the vague “this” with a specific noun phrase.)

Quick Identification Strategy: When you see a pronoun in the underlined portion and the answer choices include both pronouns and specific nouns, check whether the pronoun has a clear, unambiguous antecedent. If two or more nouns could be the antecedent, the answer that uses a specific noun is correct.

Rule 4: Pronoun Case

The Principle: Pronouns must be in the correct case: subjective (I, he, she, we, they, who), objective (me, him, her, us, them, whom), or possessive (my, his, her, our, their, whose).

Subjective case is used when the pronoun is the subject of a verb. “She and I attended the meeting.” (Both are subjects of “attended.”)

Objective case is used when the pronoun is the object of a verb or preposition. “The manager invited him and me to the meeting.” (Both are objects of “invited.”) “Between you and me, the plan has flaws.” (Objects of the preposition “between.”)

The Who/Whom Distinction: “Who” is subjective (used as the subject of a verb). “Whom” is objective (used as the object of a verb or preposition). Quick test: if you can replace the word with “he/she,” use “who.” If you can replace it with “him/her,” use “whom.”

“Who conducted the study?” (He conducted the study. Subject, so “who” is correct.)

“Whom did the committee select?” (The committee selected him. Object, so “whom” is correct.)

“The researcher who published the findings…” (He published. Subject.)

“The researcher whom the committee selected…” (The committee selected him. Object.)

SAT Testing Pattern: The SAT tests pronoun case in compound structures (“she and I” vs. “her and me”) and in who/whom choices. The trick is to mentally remove the other person from the compound structure and see which pronoun sounds right on its own. “The award was given to Maria and (I/me).” Remove Maria: “The award was given to me.” So: “The award was given to Maria and me.”

Common Mistake: Using “I” when “me” is correct in compound objects, or using “me” when “I” is correct in compound subjects. The correction is always to test the pronoun alone, without the other person in the compound.

Rule 5: Verb Tense Consistency

The Principle: Within a passage (and often within a single sentence), verb tenses should be consistent unless there is a reason to shift.

Consistent: “The researcher designed the experiment, collected the data, and published the results.” (All past tense.)

Inconsistent: “The researcher designed the experiment, collects the data, and published the results.” (Shifts from past to present to past without reason.)

SAT Testing Pattern: The SAT provides a passage written primarily in one tense and includes a blank where you must select the correct verb form. The correct answer matches the tense established by the surrounding context. You must read beyond the immediate sentence to identify the established tense.

When Tense Shifts Are Correct: A shift in tense is appropriate when the passage describes events at different times. “The company was founded in the early days of the industry. Today, it employs thousands of workers.” (Past tense for the founding, present tense for the current state.) The SAT tests whether you can distinguish between inappropriate tense shifts (errors) and appropriate tense shifts (reflecting actual changes in time).

Quick Identification Strategy: When a verb appears in the answer choices in different tenses, read the sentences before and after the blank to identify the dominant tense. Choose the tense that matches the context. If the passage discusses past events, use past tense. If it discusses current states, use present tense. If it discusses events that occurred before another past event, use past perfect.

Rule 6: Verb Tense Selection

The Principle: Different tenses express different time relationships. Choosing the correct tense requires understanding what each tense communicates.

Simple past: An action that occurred at a specific time in the past. “The team conducted the experiment.”

Present perfect (has/have + past participle): An action that began in the past and continues to the present, or a past action with present relevance. “The team has conducted five experiments this quarter.” (The quarter is still ongoing.)

Past perfect (had + past participle): An action completed before another past action. “By the time the results were published, the team had already begun a new study.” (“Had begun” happened before “were published,” and both are in the past.)

SAT Testing Pattern: The SAT tests tense selection by presenting scenarios where the timing of events matters. The most commonly tested distinction is between simple past and past perfect. If two past events are described and one happened before the other, the earlier event uses past perfect (“had + verb”) and the later event uses simple past.

Worked Example:

“After the committee _____ the proposal, they scheduled a vote.”

A) reviews B) reviewed C) had reviewed D) has reviewed

The sentence describes two past events: reviewing the proposal (first) and scheduling a vote (second). “Scheduled” is simple past, so the earlier action should be past perfect: “had reviewed.” Answer: C.

Quick Identification Strategy: Look for time markers (before, after, by the time, already, since, for) that signal the need for a specific tense. “Before” and “by the time” often signal past perfect. “Since” and “for” often signal present perfect.

Verb Tense: SAT-Style Worked Examples

Worked Example 1:

“The ancient civilization _____ a complex system of irrigation long before neighboring societies developed similar technologies.”

A) creates B) created C) had created D) has created

Two past events: creating the irrigation system (first) and developing similar technologies (second). The earlier event uses past perfect. Answer: C (had created).

Worked Example 2:

“Since the implementation of the new curriculum, student performance _____ significantly.”

A) improved B) improves C) has improved D) had improved

“Since” signals present perfect (action starting in the past and continuing to the present). Answer: C (has improved).

Worked Example 3:

“The author _____ the novel for three years before finding a publisher willing to take a chance on the unconventional story.”

A) writes B) wrote C) had been writing D) has written

“For three years before finding a publisher” indicates the writing occurred over a period that ended before the finding (another past event). Past perfect progressive (“had been writing”) correctly expresses a continuous action completed before another past action. Answer: C.

Worked Example 4:

A passage describes a historical event in past tense. One sentence reads: “The expedition _____ the summit after four days of climbing.”

A) reaches B) reached C) has reached D) had reached

The passage is in past tense, and this sentence describes a single past event within that narrative. Simple past is correct. Answer: B (reached).

Rule 7: The Subjunctive Mood

The Principle: The subjunctive mood is used for hypothetical situations, wishes, demands, and recommendations. It uses “were” instead of “was” for all subjects, and the base form of the verb after words like “recommend,” “suggest,” “require,” “demand,” and “insist.”

Correct: “If she were the lead researcher, the study would have a different design.” (“Were” because this is hypothetical, contrary to fact.)

Incorrect: “If she was the lead researcher…” (This is a common error in casual speech but incorrect in formal Standard English.)

Correct: “The board recommended that the CEO resign.” (Base form “resign” rather than “resigns” after “recommended that.”)

SAT Testing Pattern: The SAT tests the subjunctive primarily in “if…were” constructions. When you see an “if” clause describing something hypothetical or contrary to fact, the verb should be “were” regardless of the subject.

Quick Identification Strategy: Look for “if” followed by a subject. If the situation is hypothetical (not real), the verb should be “were.” If the situation is real or possible, the verb should be “was.” “If the budget were larger” (hypothetical: it is not larger). “If the budget was approved yesterday” (real: it may or may not have been approved).

Rule 8: Commas After Introductory Elements

The Principle: A comma follows an introductory word, phrase, or clause that precedes the main clause of a sentence.

After an introductory dependent clause: “Although the results were inconclusive, the researchers continued the study.”

After an introductory phrase: “In the absence of clear evidence, the committee postponed its decision.”

After an introductory transition word: “However, the findings contradicted the hypothesis.”

After a participial phrase: “Having completed the analysis, the team drafted the report.”

SAT Testing Pattern: The answer choices present the same sentence with and without the comma after the introductory element. The correct answer includes the comma.

Quick Identification Strategy: If the sentence begins with anything other than the subject of the main clause, a comma is likely needed after that introductory element before the main clause begins.

Introductory Elements: Types and Examples

The SAT tests several types of introductory elements, and knowing the types helps you recognize them quickly.

Introductory dependent clauses begin with subordinating conjunctions: although, because, since, when, while, if, after, before, until, unless, whereas, even though. These always require a comma before the main clause.

“Because the funding was insufficient, the project was postponed.”

“While the committee debated the proposal, the deadline quietly passed.”

“If the results are confirmed, the implications could be significant.”

Introductory participial phrases begin with a present participle (-ing) or past participle (-ed/-en). They always require a comma.

“Having completed the preliminary analysis, the team moved to the next phase.”

“Encouraged by the positive results, the researchers expanded the study.”

“Running behind schedule, the construction crew worked overtime.”

Introductory prepositional phrases of four or more words generally take a comma. Very short prepositional phrases (one or two words) may omit the comma.

“In the aftermath of the controversy, new regulations were implemented.” (Long prepositional phrase, comma required.)

“In time the controversy subsided.” (Short prepositional phrase, comma optional.)

Introductory transitional words and phrases always take a comma: However, Therefore, Moreover, Furthermore, Nevertheless, Consequently, In addition, For example, In fact, On the other hand, As a result, In contrast.

“Moreover, the data revealed an unexpected correlation.”

“As a result, the committee revised its recommendation.”

SAT Testing Pattern: The answer choices present the same sentence with and without the introductory comma. Some choices might also restructure the sentence so that the introductory element is no longer introductory (moving it to the middle or end of the sentence), which changes the comma rules. Always evaluate the specific structure of each answer choice independently.

Rule 9: Commas With Nonessential Clauses and Phrases

The Principle: Nonessential (parenthetical) information is set off by commas. Essential information is not.

Nonessential (commas required): “The study, which was conducted over five years, revealed significant trends.” (The clause “which was conducted over five years” provides additional information but is not necessary to identify which study is being discussed.)

Essential (no commas): “The study that was conducted over five years revealed significant trends.” (Here, the clause identifies which specific study is being discussed, distinguishing it from other studies.)

The Which/That Distinction: In Standard English as tested on the SAT, “which” introduces nonessential clauses (set off by commas) and “that” introduces essential clauses (no commas). This is a useful but not absolute rule.

SAT Testing Pattern: The answer choices differ in whether commas are present around a clause or phrase. The correct answer uses commas for nonessential information and no commas for essential information. The test is: can you remove the clause or phrase without changing the fundamental meaning of the sentence? If yes, it is nonessential and needs commas. If no, it is essential and should not have commas.

Appositives: An appositive is a noun phrase that renames or identifies the noun next to it. Nonessential appositives are set off by commas. “Dr. Chen, the lead researcher, presented the findings.” (“The lead researcher” renames Dr. Chen and is set off by commas because Dr. Chen is already fully identified by name.)

Quick Identification Strategy: When you see commas (or lack of commas) around a clause or phrase in the answer choices, apply the removal test. Read the sentence without the enclosed phrase. If the sentence still makes complete sense and identifies the subject clearly, the phrase is nonessential and needs commas.

Rule 10: Commas in Compound Sentences

The Principle: When two independent clauses are joined by a coordinating conjunction (for, and, nor, but, or, yet, so), a comma precedes the conjunction.

Correct: “The sample size was large, and the results were statistically significant.”

Incorrect (comma splice without conjunction): “The sample size was large, the results were statistically significant.” (This is a comma splice, not a compound sentence.)

No comma needed when there is NOT a second independent clause: “The sample size was large and statistically significant.” (The phrase after “and” is not an independent clause; it lacks its own subject. No comma needed.)

SAT Testing Pattern: The answer choices present a conjunction between two clauses with and without a preceding comma. Determine whether both sides of the conjunction are independent clauses. If yes, include the comma. If no, omit it.

Quick Identification Strategy: Cover the conjunction and everything before it. Is what remains after the conjunction a complete sentence on its own? If yes, add a comma before the conjunction. If no, do not.

Rule 11: Commas in Lists

The Principle: Items in a list of three or more are separated by commas.

Correct: “The experiment tested reaction time, memory recall, and pattern recognition.”

The final comma before “and” (the Oxford comma or serial comma) is used consistently on the SAT. Always include it.

SAT Testing Pattern: The answer choices may vary in comma placement within a list. The correct answer separates all items with commas, including the comma before the final “and.”

Rule 12: Commas Between Coordinate Adjectives

The Principle: Coordinate adjectives (adjectives that independently modify the same noun) are separated by a comma. Non-coordinate adjectives (where one adjective modifies the noun phrase formed by the other adjective plus the noun) are not.

Coordinate (comma needed): “The rigorous, innovative study challenged existing assumptions.” (Both “rigorous” and “innovative” independently describe the study. You can reverse them: “innovative, rigorous study.”)

Non-coordinate (no comma): “The large research study was published.” (“Large” modifies “research study” as a unit. You would not say “the research large study.”)

Test for Coordinate Adjectives: Try two tests. First, reverse the adjectives. If the phrase still sounds natural, they are coordinate. Second, insert “and” between them. If it still sounds natural, they are coordinate. If either test fails, the adjectives are non-coordinate and should not be separated by a comma.

Rule 13: Comma Splices (Incorrect Use)

The Principle: A comma alone cannot join two independent clauses. Using a comma without a coordinating conjunction between two independent clauses creates a comma splice, which is always incorrect.

Comma splice (incorrect): “The data supported the hypothesis, the researchers published their findings.”

Correct versions: “The data supported the hypothesis, and the researchers published their findings.” (Comma + conjunction.) “The data supported the hypothesis; the researchers published their findings.” (Semicolon.) “The data supported the hypothesis. The researchers published their findings.” (Two separate sentences.)

SAT Testing Pattern: One answer choice creates a comma splice; the other choices use correct punctuation. Identifying the comma splice and eliminating it is the fastest approach.

Quick Identification Strategy: Whenever you see a comma between what appear to be two complete sentences (each with a subject and verb forming a complete thought), check whether there is a coordinating conjunction after the comma. If there is no conjunction, it is a comma splice and is wrong.

Punctuation: SAT-Style Worked Examples

Worked Example 1 (Comma Splice vs Correct Punctuation):

“The archaeological team discovered artifacts from multiple historical periods, _____ the findings suggest the site was inhabited for centuries.”

A) , (no change, creating a comma splice) B) ; (semicolon between independent clauses) C) , but (comma + conjunction) D) Both B and C would be correct on the SAT, but since only one answer can be correct, the choices would be structured differently.

On the actual SAT, the choices would each present a different punctuation option. If the choices are a comma alone, a semicolon, a period, and a comma with “and,” you would eliminate the comma alone (comma splice) and choose based on the relationship between the clauses.

Worked Example 2 (Semicolon vs Comma):

“The initial experiment produced unexpected results _____ the research team decided to modify their methodology.”

A) , the (comma splice - incorrect) B) ; the (semicolon between independent clauses - correct) C) , and the (comma + conjunction - correct) D) the (run-on - incorrect)

Both B and C are grammatically correct. On the SAT, only one answer will appear, and the question will be structured so that exactly one option is correct.

Worked Example 3 (Colon Usage):

“The study examined three factors that influence consumer behavior _____ price sensitivity, brand loyalty, and social media exposure.”

A) , (comma - incorrect, because what precedes is a complete sentence introducing a list) B) : (colon - correct, because a complete sentence precedes it and introduces a list) C) ; (semicolon - incorrect, because what follows is not an independent clause) D) - (could work in some contexts, but the colon is the standard choice for introducing a list after a complete sentence)

Answer: B (colon).

Worked Example 4 (Nonessential Clause):

“Dr. Rivera ___ has published over fifty papers in peer-reviewed journals ___ was selected to lead the new research initiative.”

A) , who has published over fifty papers in peer-reviewed journals, B) who has published over fifty papers in peer-reviewed journals C) , who has published over fifty papers in peer-reviewed journals D) who has published over fifty papers in peer-reviewed journals,

The clause “who has published over fifty papers” is nonessential because Dr. Rivera is already identified by name. The nonessential clause must be set off by commas on BOTH sides. Answer: A.

This is a critical point: nonessential information enclosed within a sentence needs commas on both sides, not just one. An answer that has a comma before but not after (or after but not before) is incorrect.

Worked Example 5 (Essential vs Nonessential):

Version A: “Students who submitted their work late received a penalty.” (No commas. “Who submitted their work late” is essential because it tells us which students received a penalty. Only the late students, not all students.)

Version B: “The students, who submitted their work late, received a penalty.” (Commas. “Who submitted their work late” is nonessential. All the students submitted late, and this is just additional information.)

The SAT tests whether you can determine from context whether the clause is essential or nonessential. The answer depends on the passage context: is the clause identifying a specific subset, or is it adding parenthetical information about an already-identified group?

Rule 14: Semicolons Between Independent Clauses

The Principle: A semicolon joins two independent clauses that are closely related in meaning. Both clauses must be complete sentences on their own.

Correct: “The initial results were promising; the follow-up study confirmed the findings.”

Incorrect: “The initial results were promising; confirming the hypothesis.” (“Confirming the hypothesis” is not an independent clause.)

SAT Testing Pattern: The answer choices offer a semicolon, a comma, a comma plus conjunction, or a period. The semicolon is correct only when both sides are independent clauses.

Quick Identification Strategy: Cover everything before the semicolon. Is what follows a complete sentence? If yes, the semicolon may be correct (if what precedes it is also a complete sentence). If no, the semicolon is wrong.

Semicolons: Common Errors and Clarifications

Error 1: Using a semicolon before a dependent clause.

Incorrect: “The team worked efficiently; because they had clear goals.” (“Because they had clear goals” is a dependent clause, not an independent clause.)

Correct: “The team worked efficiently because they had clear goals.” (No semicolon needed; just connect the clauses directly.)

Error 2: Using a semicolon before a list without an introductory clause.

Incorrect: “The lab needs; beakers, pipettes, and test tubes.”

Correct: “The lab needs beakers, pipettes, and test tubes.” (No special punctuation before the list.)

Correct with semicolons IN the list: Semicolons can separate items in a list when the items themselves contain commas. “The conference will be held in Paris, France; Tokyo, Japan; and Sydney, Australia.” This is a rare but valid use tested occasionally on the SAT.

Error 3: Confusing semicolons with colons.

A semicolon connects two related independent clauses. A colon introduces a list or explanation after an independent clause. If what follows is a list, use a colon (not a semicolon). If what follows is another independent clause, use a semicolon.

Rule 15: Semicolons With Transitional Phrases

The Principle: When a transitional word or phrase (however, therefore, moreover, furthermore, consequently, nevertheless, in addition, for example, in fact, as a result) connects two independent clauses, the correct punctuation is: semicolon + transition + comma.

Correct: “The data supported the hypothesis; however, the sample size was small.”

Incorrect: “The data supported the hypothesis, however, the sample size was small.” (This is a comma splice with a transition jammed in.)

Also correct: “The data supported the hypothesis. However, the sample size was small.” (Period instead of semicolon is acceptable.)

SAT Testing Pattern: The answer choices often include a comma splice version (comma before “however”), a semicolon version (semicolon before “however”), and a period version (period, then “However,”). Both the semicolon version and the period version are grammatically correct. The comma version is always wrong.

Important Distinction: Coordinating conjunctions (for, and, nor, but, or, yet, so) use a different pattern: comma + conjunction. Transitional words (however, therefore, moreover) use: semicolon + transition + comma. Confusing these two patterns is a common error.

“The data was strong, but the sample was small.” (Correct: comma + coordinating conjunction.)

“The data was strong; however, the sample was small.” (Correct: semicolon + transitional word + comma.)

“The data was strong, however, the sample was small.” (Incorrect: comma splice.)

Complete List of Transitional Words and Their Punctuation

These words CANNOT be used with just a comma between independent clauses. They require a semicolon (or period) before them and a comma after them:

Addition: moreover, furthermore, additionally, in addition, also, likewise, similarly

Contrast: however, nevertheless, nonetheless, on the other hand, in contrast, conversely, on the contrary, still

Cause/Effect: therefore, consequently, thus, hence, accordingly, as a result, for this reason

Example: for example, for instance, specifically, in particular, to illustrate, namely

Emphasis: indeed, in fact, certainly, undoubtedly

Summary: in summary, in conclusion, overall, ultimately, in short, to sum up

Sequence: meanwhile, subsequently, thereafter, afterward, then (when used as a transition)

Concession: admittedly, granted, of course, to be sure

Memorizing which words are transitions (requiring semicolons) and which are coordinating conjunctions (requiring commas) prevents one of the most common punctuation errors on the SAT.

Quick Identification Strategy: When you see a transitional word like “however,” “therefore,” or “moreover” between two clauses, check the punctuation before it. It should be a semicolon or a period, not a comma.

Rule 16: Colons

The Principle: A colon introduces a list, explanation, or elaboration. The clause before the colon must be a complete sentence (independent clause).

Correct: “The team identified three priorities: improving efficiency, reducing costs, and expanding partnerships.”

Incorrect: “The team’s three priorities were: improving efficiency, reducing costs, and expanding partnerships.” (“The team’s three priorities were” is not a complete sentence.)

Correct fix: “The team’s three priorities were as follows: improving efficiency, reducing costs, and expanding partnerships.” (“The team’s three priorities were as follows” is a complete sentence.)

Additional Correct Use: A colon can introduce a single explanation or elaboration (not just a list). “The verdict was clear: the defendant was not guilty.” Here, the colon introduces an explanation of what “clear” means.

Another Correct Use: A colon can introduce a quotation when the introductory text is a complete sentence. “The professor made a bold claim: ‘This discovery will change the field.’”

SAT Testing Pattern: The answer choices include different punctuation options for introducing a list or explanation. The colon is correct only when preceded by a complete sentence.

Quick Identification Strategy: Before selecting a colon, read only the text before it. If it is a complete sentence that can stand alone, the colon is valid. If it cannot stand alone (like “The three items are:”), the colon is wrong.

Common Colon Errors on the SAT:

Using a colon after “such as” or “including.” These words already introduce examples, so a colon is redundant. “The store sells fruits such as apples, oranges, and bananas.” (Correct, no colon.) “The store sells fruits: such as apples, oranges, and bananas.” (Incorrect, redundant.)

Using a colon after a verb. “The committee decided: to postpone the vote.” (Incorrect; “The committee decided” leads directly to its object.) “The committee made a decision: to postpone the vote.” (Correct; “The committee made a decision” is a complete sentence.)

Rule 17: Apostrophes for Possession

The Principle: Apostrophes indicate possession (ownership).

Singular nouns: Add apostrophe + s. “The researcher’s findings.” “James’s presentation.”

Plural nouns ending in s: Add only an apostrophe. “The researchers’ findings.” “The students’ projects.”

Irregular plural nouns (not ending in s): Add apostrophe + s. “The children’s books.” “The women’s committee.”

SAT Testing Pattern: The answer choices present different apostrophe placements, and you must determine whether the possessor is singular or plural to place the apostrophe correctly.

Worked Example:

“All of the (teachers/teacher’s/teachers’) evaluations were positive.”

If multiple teachers each had evaluations: “teachers’ evaluations” (plural possessive).

If one teacher had multiple evaluations: “teacher’s evaluations” (singular possessive).

The SAT will make the context clear so that only one option is correct.

Rule 18: Apostrophes in Contractions

The Principle: Apostrophes replace omitted letters in contractions.

“It’s” = “it is” or “it has”

“They’re” = “they are”

“Who’s” = “who is” or “who has”

“You’re” = “you are”

“Don’t” = “do not”

“Shouldn’t” = “should not”

SAT Note: The SAT generally prefers the formal, uncontracted forms in written prose. However, contractions may appear in passages, and you should be able to distinguish between contractions and possessives (Rule 19).

Rule 19: Its vs It’s and Other Commonly Confused Pairs

The Principle: Possessive pronouns NEVER use apostrophes. Contractions always do. This creates confusion with pairs that sound identical.

Its (possessive): “The company increased its revenue.” (Belonging to the company.)

It’s (contraction): “It’s important to review the data.” (It is important.)

Their (possessive): “The students completed their assignments.”

There (location/existence): “There are several reasons for the change.”

They’re (contraction): “They’re planning to expand the program.” (They are planning.)

Your (possessive): “Your analysis is thorough.”

You’re (contraction): “You’re expected to present the findings.” (You are expected.)

Whose (possessive): “The researcher whose study was published received an award.”

Who’s (contraction): “Who’s responsible for this project?” (Who is responsible.)

SAT Testing Pattern: The answer choices present these commonly confused pairs, and you must select the one that fits the context. The test is simple: try expanding the contraction. If “it is” works in the sentence, use “it’s.” If “belonging to it” works, use “its.”

Quick Identification Strategy: Whenever you see “its” or “it’s” (or any similar pair) in the answer choices, mentally substitute “it is.” If the sentence makes sense with “it is,” choose the contraction. If not, choose the possessive.

Rule 20: Sentence Fragments

The Principle: A sentence must contain a subject and a predicate (verb) and express a complete thought. A fragment lacks one of these elements.

Fragment (no main verb): “The researcher who conducted the groundbreaking study.” (This has a subject, “researcher,” but the only verb, “conducted,” is inside a relative clause. There is no main verb.)

Complete: “The researcher who conducted the groundbreaking study received international recognition.”

Fragment (dependent clause standing alone): “Although the results were promising.” (This is a dependent clause that cannot stand alone.)

Complete: “Although the results were promising, the team decided to conduct further tests.”

Fragment (participial phrase): “Having completed the analysis and drafted the report.” (This is a phrase, not a sentence.)

Complete: “Having completed the analysis and drafted the report, the team submitted their work.”

SAT Testing Pattern: The SAT tests fragments by presenting answer choices where one option creates a complete sentence and another creates a fragment. Fragments are always wrong on the SAT.

Quick Identification Strategy: After selecting an answer, read the resulting sentence and ask: does this have a subject? Does it have a main verb (not inside a dependent clause)? Does it express a complete thought? If any answer is no, you have a fragment.

Fragments and Run-Ons: SAT-Style Worked Examples

Worked Example 1 (Fragment vs Complete Sentence):

“Although the survey results indicated strong public support for the initiative. The committee decided to delay the vote.”

The first sentence is a fragment (a dependent clause beginning with “Although” that lacks a main clause). The correction joins the two: “Although the survey results indicated strong public support for the initiative, the committee decided to delay the vote.”

On the SAT, the answer choices would present different ways to connect these two parts. The correct answer removes the period and adds a comma after “initiative,” creating a properly structured complex sentence.

Worked Example 2 (Identifying a Fragment in Answer Choices):

“The research team published its findings, _____ attracting widespread attention from the scientific community.”

A) which were (makes “which were attracting” a nonessential clause modifying “findings” - grammatically correct but changes meaning) B) thereby (makes “thereby attracting” a participial phrase modifying the main clause - grammatically correct) C) they were (creates a comma splice with two independent clauses joined by only a comma) D) and it was (could create a compound sentence, but “it was attracting” is awkward)

The best answer depends on meaning and grammar. B is clean and correct. C is a comma splice. This illustrates how the SAT tests your ability to distinguish between correct and incorrect clause connections.

Worked Example 3 (Run-On Correction):

“The new policy addressed several longstanding concerns _____ it was met with resistance from some department heads.”

A) , (comma splice - incorrect) B) ; however, (semicolon + transition + comma - correct) C) , and (comma + conjunction - correct, if the relationship is simple addition) D) . However, (period + transition - correct)

A is incorrect (comma splice). B, C, and D are all grammatically correct ways to join or separate the clauses. On the SAT, only one of these options would appear in the answer choices. The question tests whether you can identify the comma splice (A) as incorrect and select one of the properly punctuated alternatives.

Rule 21: Run-On Sentences

The Principle: Two independent clauses cannot be joined without proper punctuation or a conjunction. Joining them without either creates a run-on (fused sentence).

Run-on: “The data was compelling the committee approved the proposal.” (Two independent clauses with no punctuation or conjunction between them.)

Correct options:

Period: “The data was compelling. The committee approved the proposal.”

Semicolon: “The data was compelling; the committee approved the proposal.”

Comma + conjunction: “The data was compelling, and the committee approved the proposal.”

Subordination: “Because the data was compelling, the committee approved the proposal.”

SAT Testing Pattern: The answer choices offer different ways to connect two clauses. One choice creates a run-on or comma splice; the others use correct punctuation. Identify the two independent clauses and choose the answer that connects them properly.

Quick Identification Strategy: Locate the boundary between two independent clauses (the point where one complete thought ends and another begins). Check what punctuation or conjunction appears at that boundary. If there is nothing or only a comma without a conjunction, the sentence has a structural error.

Rule 22: Parallel Structure

The Principle: Elements in a list, comparison, or paired construction must be in the same grammatical form.

Parallel: “The study involved designing experiments, collecting data, and analyzing results.” (All gerund phrases.)

Not parallel: “The study involved designing experiments, data collection, and to analyze results.” (Gerund, noun phrase, infinitive: three different forms.)

Parallel in comparisons: “Running is more exhausting than swimming.” (Two gerunds.)

Not parallel: “Running is more exhausting than to swim.” (Gerund compared to infinitive.)

Parallel in paired constructions:

“Not only…but also”: “The method is not only efficient but also cost-effective.” (Both adjectives.)

“Either…or”: “You can either submit the report today or request an extension.” (Both verb phrases.)

“Neither…nor”: “The approach was neither practical nor affordable.” (Both adjectives.)

“Both…and”: “The researcher was both meticulous and creative.” (Both adjectives.)

SAT Testing Pattern: The answer choices present different grammatical forms for an element in a list or comparison. The correct answer matches the form of the other elements.

Quick Identification Strategy: When you see a list or a paired construction (not only…but also, either…or), identify the grammatical form of each element. If one element differs in form from the others, that element needs to be revised to match.

Parallel Structure: SAT-Style Worked Examples

Worked Example 1:

“The company’s strategic plan focuses on expanding international markets, _____, and improving customer satisfaction.”

A) to reduce operational costs B) reducing operational costs C) the reduction of operational costs D) operational cost reduction

The other two elements in the list are gerund phrases (“expanding” and “improving”). The parallel choice must also be a gerund phrase. Answer: B (reducing operational costs).

Worked Example 2:

“The researcher is known not only for her innovative methodology but also for _____.”

A) she publishes prolifically B) her prolific publications C) being a prolific publisher D) prolifically publishing

After “not only for her innovative methodology,” the parallel structure requires “for” + noun phrase. “For her prolific publications” matches the pattern of “for her innovative methodology.” Answer: B.

Worked Example 3:

“The ideal candidate must have experience in data analysis, _____, and team leadership.”

A) communicating effectively B) effective communication C) to communicate effectively D) being an effective communicator

The other items are noun phrases (“data analysis” and “team leadership”). The parallel choice must also be a noun phrase. Answer: B (effective communication).

Worked Example 4 (Comparison Parallelism):

“The researchers found that exercising regularly was more beneficial than _____ medications.”

A) to take B) taking C) they took D) the taking of

The comparison is between gerund phrases: “exercising regularly” compared to what? The parallel form is another gerund: “taking medications.” Answer: B.

Rule 23: Dangling Modifiers

The Principle: A modifying phrase at the beginning of a sentence must logically modify the subject of the main clause.

Dangling: “Walking through the park, the flowers were beautiful.” (This implies the flowers were walking.)

Correct: “Walking through the park, she noticed the beautiful flowers.” (Now “she” is the one walking.)

Dangling: “After reviewing the data, the conclusion was that the hypothesis was supported.” (The conclusion did not review the data.)

Correct: “After reviewing the data, the researchers concluded that the hypothesis was supported.”

SAT Testing Pattern: The SAT presents a sentence with an introductory modifying phrase followed by a comma and the main clause. The answer choices offer different subjects for the main clause. The correct answer places the noun that logically performs the action of the modifier immediately after the comma.

Quick Identification Strategy: Read the introductory phrase and ask: who or what is performing this action? Then check that the subject immediately after the comma is that person or thing. If the subject does not logically perform the action described in the introductory phrase, the modifier is dangling.

Dangling Modifiers: SAT-Style Worked Examples

Worked Example 1:

“Having analyzed the results of the clinical trial, _____.”

A) the treatment was deemed effective by the researchers B) effectiveness of the treatment was confirmed C) the researchers deemed the treatment effective D) it was determined that the treatment was effective

Who analyzed the results? The researchers. The subject after the comma must be “the researchers.” Answer: C.

Worked Example 2:

“Concerned about the environmental impact, _____.”

A) the policy was revised by the committee B) the committee revised the policy C) revisions to the policy were proposed D) a revised policy was introduced

Who was concerned? The committee. Answer: B.

Worked Example 3:

“To achieve the best results, _____.”

A) the experiment should be repeated multiple times B) multiple repetitions of the experiment are recommended C) researchers should repeat the experiment multiple times D) Both A and C are grammatically correct

An infinitive phrase (“To achieve”) can modify the subject of the main clause. Both “the experiment” (A) and “researchers” (C) could work, but A creates a slight logical issue (the experiment does not “achieve results” on its own; the researchers do). The SAT would structure choices so only one is unambiguously correct, typically C.

Worked Example 4:

“Born in a small rural community, _____.”

A) the scientist’s early research focused on agricultural problems B) the scientist focused her early research on agricultural problems C) agricultural problems became the focus of the scientist’s early research D) it was agricultural problems that the scientist studied first

Who was born in a small rural community? The scientist. The subject must be “the scientist” (not “the scientist’s early research,” “agricultural problems,” or “it”). Answer: B.

This last example highlights a subtle but important distinction: “the scientist’s early research” is not the scientist. The possessive form makes “research” the subject, which was not born in a community. The scientist was. The SAT exploits this possessive trap frequently.

Rule 24: Misplaced Modifiers

The Principle: A modifier should be placed as close as possible to the word it modifies. Placing it too far away creates ambiguity or an unintended meaning.

Misplaced: “The researcher almost tested every sample in the lab.” (This suggests the researcher came close to testing but did not actually test. “Almost” modifies “tested.”)

Correct: “The researcher tested almost every sample in the lab.” (This means the researcher tested most but not all samples. “Almost” modifies “every.”)

Misplaced: “She only eats organic vegetables.” (This suggests eating is the only thing she does with organic vegetables, not cooking or growing them. Probably the intended meaning is: “She eats only organic vegetables,” meaning she eats nothing but organic vegetables.)

SAT Testing Pattern: The answer choices rearrange the modifier’s position in the sentence. The correct answer places the modifier immediately before or after the word it logically modifies.

Quick Identification Strategy: When you see a modifier like “only,” “almost,” “nearly,” “just,” or “even” in the answer choices, identify what the modifier is intended to modify and ensure it is placed directly next to that word.

Rule 25: Logical Comparisons

The Principle: Comparisons must be between logically comparable things. You cannot compare a person to a place, a quality to a thing, or a process to a result without ensuring the comparison is parallel and logical.

Illogical: “The GDP of France is larger than Germany.” (Compares GDP to a country.)

Logical: “The GDP of France is larger than that of Germany.” (“That” refers to “the GDP,” making the comparison between GDP and GDP.)

Illogical: “The population of Tokyo is greater than London.” (Compares population to a city.)

Logical: “The population of Tokyo is greater than the population of London.”

SAT Testing Pattern: The answer choices include comparison structures, some of which compare illogical elements. The correct answer ensures the comparison is between the same types of things.

Quick Identification Strategy: In any comparison, identify what is being compared on each side. Are you comparing apples to apples? If one side names a quality and the other names a person or place, the comparison is illogical.

Logical Comparisons: SAT-Style Worked Examples

Worked Example 1:

“The research output of the university is greater than _____.”

A) other universities B) that of other universities C) other universities’ outputs D) what other universities output

The sentence compares “the research output” of one university. The comparison must be to the research output of other universities, not to “other universities” themselves. “That of” serves as a pronoun replacement for “the research output of.” Answer: B.

Worked Example 2:

“The speed of light is much faster than _____.”

A) sound B) the speed of sound C) that of sound D) Both B and C are correct

You are comparing speed to speed, not speed to a phenomenon. “The speed of sound” (B) and “that of sound” (C) are both logically correct. On the SAT, only one would appear. The key is to avoid A (“sound”), which compares speed to a phenomenon.

Worked Example 3:

“Like most of her contemporaries, _____.”

A) the novelist’s work focused on themes of social change B) the novelist focused her work on themes of social change C) themes of social change were central to the novelist’s work D) social change was a theme in the novelist’s work

“Like most of her contemporaries” compares the novelist to her contemporaries (people to people). The subject must be “the novelist” (a person), not “the novelist’s work” (a thing) or “themes” (a thing). Answer: B.

This is a hybrid of the logical comparison rule and the dangling modifier rule. The SAT frequently combines rules in a single question, testing whether you can identify both issues simultaneously.

Rule 26: Redundancy and Wordiness

The Principle: Good writing avoids unnecessary repetition and uses the most concise expression that conveys the meaning.

Redundant: “The future forecast predicted upcoming events that will happen later.” (Multiple redundancies: “future” and “forecast,” “upcoming” and “later,” “predicted” and “will happen.”)

Concise: “The forecast predicted future events.”

Common redundancies tested on the SAT:

“Past history” (history is already about the past). “Advance planning” (planning is already done in advance). “Collaborate together” (collaborate already means work together). “Revert back” (revert already means go back). “Free gift” (a gift is already free). “End result” (a result is already at the end). “Each and every” (use one or the other). “In order to” (usually “to” suffices). “Due to the fact that” (use “because”). “In spite of the fact that” (use “although”). “At the present time” (use “currently” or “now”). “In the event that” (use “if”). “Has the ability to” (use “can”). “Is able to” (use “can”). “A total of ten” (use “ten”).

Redundancy and Wordiness: SAT-Style Worked Examples

Worked Example 1:

“The two candidates both agreed to participate in a joint debate together.”

Redundancies: “two” and “both” (both means two), “joint” and “together” (joint already implies together).

Concise: “The candidates agreed to participate in a joint debate.” Or: “Both candidates agreed to participate in a debate.”

On the SAT, the correct answer would be the most concise option that preserves the full meaning.

Worked Example 2:

“The committee unanimously voted without any disagreement to approve the measure.”

Redundancy: “unanimously” and “without any disagreement” mean the same thing.

Concise: “The committee unanimously voted to approve the measure.”

Worked Example 3:

“Due to the fact that the budget was limited, the team was unable to hire additional staff.”

Wordy: “Due to the fact that” is a verbose way of saying “because.”

Concise: “Because the budget was limited, the team was unable to hire additional staff.”

SAT Testing Pattern: The answer choices present the same idea in different levels of verbosity. The correct answer is the most concise option that fully conveys the intended meaning without sacrificing clarity. When in doubt between two options that seem equally correct, choose the shorter one.

Quick Identification Strategy: If two answer choices convey the same meaning but one uses fewer words, the shorter one is usually correct. Choose the answer that is clear, complete, and free of unnecessary repetition.

How Grammar Rules Connect: Multi-Rule Questions

The hardest grammar questions on the SAT test two rules simultaneously. Recognizing these compound questions is important for avoiding traps.

Modifier + Punctuation: A sentence begins with a participial phrase. The correct answer must both fix the dangling modifier (place the correct subject after the comma) and use proper punctuation.

Agreement + Tense: A sentence has a subject-verb agreement issue and a tense issue. The correct answer fixes both simultaneously. Students who notice only one error might select an answer that fixes the agreement but uses the wrong tense, or vice versa.

Parallelism + Wordiness: A sentence contains a list where one element is not parallel and another is redundant. The correct answer creates parallelism while also being concise.

Worked Example (Two Rules):

“Having conducted an extensive review of the literature, the study’s methodology _____ based on established frameworks.”

A) was (dangling modifier: “the study’s methodology” did not conduct the review; wrong subject) B) were (same dangling modifier issue, plus wrong number agreement) C) is (dangling modifier, plus wrong tense if context is past) D) None of the above fix the dangling modifier

The real correction requires changing the subject: “Having conducted an extensive review of the literature, the researchers based their methodology on established frameworks.” If the SAT presents this, the correct answer would restructure the sentence so that “the researchers” (or equivalent) is the subject.

Strategy for Multi-Rule Questions: Check each answer choice against ALL rules, not just the first rule you identify. An answer that fixes one problem but creates another is still wrong.

The Complete Grammar Study Plan

Week 1: Agreement and Pronouns (Days 1-7)

Days 1-2: Subject-verb agreement (all cases including tricky subjects) Days 3-4: Pronoun-antecedent agreement and pronoun clarity Days 5-6: Pronoun case (who/whom, compound structures) Day 7: Mixed practice on all agreement and pronoun rules (20+ questions)

Week 2: Punctuation (Days 8-14)

Days 8-9: Comma rules (introductory elements, nonessential clauses, compound sentences, lists, coordinate adjectives) Days 10-11: Semicolons (between clauses, with transitions) and colons Day 12: Apostrophes (possession, contractions, commonly confused pairs) Days 13-14: Sentence boundaries (fragments, run-ons, comma splices) - 25+ questions

Week 3: Structure and Style (Days 15-21)

Days 15-16: Verb tense (consistency, selection, past perfect, subjunctive) Days 17-18: Parallel structure and logical comparisons Days 19-20: Modifiers (dangling, misplaced) and redundancy Day 21: Full mixed practice covering all rules (30+ questions)

Week 4: Integration and Speed Building

Take timed sets of 15 to 20 grammar questions in 15 minutes. Analyze every error. Revisit weak rules. Take a full Reading and Writing practice section to see grammar questions in context alongside reading comprehension questions.

Ongoing Maintenance

After the initial four-week study period, continue practicing grammar as part of your broader SAT preparation. Include 10 grammar questions in each mixed practice session to maintain fluency. Review the rapid-reference table before each practice test and before the actual exam.

Rule 27: Relative Pronouns (Who, Which, That)

The Principle: The correct relative pronoun depends on the antecedent and whether the clause is essential or nonessential.

Who/whom: Refers to people. “The researcher who published the study…” “The student whom the professor mentored…”

Which: Refers to things and introduces nonessential clauses (with commas). “The study, which took three years, was published in a major journal.”

That: Refers to things and introduces essential clauses (without commas). “The study that took three years was more comprehensive than the others.”

SAT Testing Pattern: The answer choices offer different relative pronouns. Choose “who/whom” for people, “which” for things in nonessential clauses (with commas), and “that” for things in essential clauses (without commas).

Rule 28: Frequently Confused Words

Beyond the its/it’s and their/there/they’re distinctions covered in Rule 19, the SAT tests several other commonly confused word pairs.

Affect (verb: to influence) vs. Effect (noun: a result): “The weather affected the experiment.” “The effect of the treatment was significant.”

Accept (to receive or agree) vs. Except (to exclude): “The committee accepted the proposal.” “All members attended except the treasurer.”

Then (time) vs. Than (comparison): “First we collected data; then we analyzed it.” “The results were better than expected.”

Principle (a fundamental rule) vs. Principal (primary, or head of a school): “The principle of conservation of energy…” “The principal investigator led the study.”

Complement (to complete or enhance) vs. Compliment (to praise): “The data complemented the existing research.” “The supervisor complimented the team.”

Stationary (not moving) vs. Stationery (writing paper): “The equipment remained stationary.” “She wrote the letter on formal stationery.”

Precede (to come before) vs. Proceed (to continue): “The introduction precedes the main text.” “After the break, we will proceed with the presentation.”

Fewer (countable items) vs. Less (uncountable amounts): “Fewer students attended.” “Less attention was given to the topic.”

Frequently Confused Words: SAT-Style Worked Examples

Worked Example 1:

“The new regulations will _____ how companies handle customer data.”

A) affect B) effect

“Affect” is the verb meaning “to influence.” “Effect” is typically a noun meaning “a result.” Since the blank needs a verb (following “will”), the answer is A (affect).

Memory aid: Affect is the Action (verb). Effect is the End result (noun).

Note: “Effect” can be used as a verb meaning “to bring about” (as in “to effect change”), but this usage is rare and less commonly tested.

Worked Example 2:

“The committee’s decision had a significant _____ on the department’s budget.”

A) affect B) effect

Here the blank needs a noun (following “a significant”). The answer is B (effect).

Worked Example 3:

“The survey revealed that ___ participants preferred the original design ___ the updated version.”

A) fewer, than B) less, than C) fewer, then D) less, then

“Participants” are countable, so “fewer” is correct (not “less”). “Than” is used for comparisons (not “then,” which refers to time). Answer: A.

Worked Example 4:

“The university accepted all applications _____ those from students who had not completed the prerequisite coursework.”

A) accept B) except

“Except” means to exclude. The sentence is excluding certain applications. Answer: B.

Additional Commonly Confused Pairs:

Lie (to recline; lie, lay, lain) vs. Lay (to place something; lay, laid, laid): “She lay down on the couch.” “She laid the book on the table.” This distinction is frequently violated in casual speech but may appear on the SAT.

Rise (to go up, no object) vs. Raise (to lift something up, requires an object): “Temperatures rise in summer.” “The farmer raises cattle.”

Imply (to suggest indirectly, done by a speaker/writer) vs. Infer (to conclude from evidence, done by a listener/reader): “The author implied that the policy was flawed.” “The reader inferred that the author opposed the policy.”

Ensure (to make certain) vs. Insure (to provide insurance): “Please ensure that all documents are submitted.” “The company insured the building against flood damage.”

Farther (physical distance) vs. Further (degree or extent): “The trailhead is farther down the road.” “Further analysis is needed.”

Elicit (to draw out) vs. Illicit (illegal): “The question elicited a strong response.” “The investigation uncovered illicit activities.”

Knowing these pairs cold eliminates hesitation on the SAT. When you encounter one of these words in the answer choices, you can immediately identify the correct usage based on the context without second-guessing yourself.

How Frequently Confused Words Appear on the SAT

The SAT presents these pairs within passage contexts where only one option is correct. The question never explicitly says “choose between affect and effect.” Instead, the answer choices might offer four different sentence completions, with one using “affect” and another using “effect.” The other two choices might use different constructions entirely. Your job is to recognize which word fits the context grammatically and semantically.

A useful preparation strategy is to create flashcards for each commonly confused pair and drill them until the correct usage is automatic. This is pure memorization and can be completed in a single study session. Once learned, these pairs are rarely forgotten because the distinctions are logical and clear.

How to Identify Which Rule Is Being Tested

The fastest path to the correct answer on a grammar question is identifying the specific rule being tested before evaluating the answer choices. Here is how to identify the rule quickly.

Step 1: Look at what changes between the answer choices. If the choices differ in verb forms (is/are, was/were, has/had), the question tests agreement or tense. If they differ in punctuation (comma, semicolon, colon, period), the question tests punctuation rules. If they differ in pronoun forms (he/him, who/whom, its/it’s), the question tests pronoun rules. If they differ in word order or phrasing, the question tests modifiers, parallelism, or wordiness.

Step 2: Apply the relevant rule. Once you know the category, apply the specific rule. For agreement questions, identify the subject. For tense questions, identify the time context. For punctuation questions, identify whether you have independent clauses, nonessential phrases, or lists.

Step 3: Select the answer that follows the rule. Do not choose the answer that “sounds right.” Choose the one that follows the grammatical rule. Your ear can deceive you because casual speech frequently violates grammar rules that the SAT enforces.

This three-step process should take 15 to 30 seconds. With practice, it becomes almost instantaneous, allowing you to answer grammar questions in well under a minute each.

Detailed Identification Guide: What Changes Between Choices

Here is a more detailed guide to identifying the rule from the answer choices.

If the answer choices differ in verb forms:

Is/are, was/were, has/have: Subject-verb agreement. Find the subject and determine its number.

Was/had been/has been/is: Verb tense. Read the passage for time context.

Was/were (with “if”): Subjunctive mood. Determine if the situation is hypothetical.

If the answer choices differ in punctuation between clauses:

Comma alone vs. semicolon vs. period vs. comma + conjunction: Sentence boundary rules. Determine whether both sides are independent clauses.

Comma present vs. comma absent around a phrase: Essential vs. nonessential information. Apply the removal test.

Colon vs. comma vs. semicolon before a list: Colon rules. Check whether what precedes is a complete sentence.

If the answer choices differ in pronoun forms:

Its/it’s, their/they’re, whose/who’s: Possessive vs. contraction. Try expanding the contraction to test.

Who/whom: Pronoun case. Substitute he/him to test.

He/she/they or his/her/their: Pronoun agreement. Find the antecedent and check its number.

A pronoun vs. a specific noun: Pronoun clarity. Check whether the pronoun has an ambiguous reference.

If the answer choices differ in word forms or structure:

Different grammatical forms for list items (gerund vs. infinitive vs. noun): Parallel structure. Match the form of the other items in the list.

Different subjects after an introductory phrase: Dangling modifier. Identify who performs the action in the introductory phrase.

Different word orders for a modifier (only, almost, nearly): Misplaced modifier. Place the modifier next to what it modifies.

Longer vs. shorter versions of the same idea: Redundancy/wordiness. Choose the most concise option.

If the answer choices differ in which relative pronoun is used:

Who vs. which vs. that: Relative pronoun selection. “Who” for people, “which” for nonessential clauses about things, “that” for essential clauses about things.

Comprehensive Practice: 10 SAT-Style Questions With Explanations

Question 1:

“The collection of artifacts discovered during the archaeological dig _____ now on display at the national museum.”

A) are B) is C) were D) have been

Rule tested: Subject-verb agreement. Subject is “collection” (singular), not “artifacts.” Answer: B.

Question 2:

“Having spent months preparing the proposal, _____ was deeply disappointed by the committee’s rejection.”

A) the proposal B) disappointment C) the team D) it

Rule tested: Dangling modifier. Who spent months preparing? The team. Answer: C.

Question 3:

“The researchers published their findings in a prestigious journal _____ the results were subsequently cited in over two hundred academic papers.”

A) , B) ; C) , and D) B and C are both correct

Rule tested: Sentence boundaries. Two independent clauses need a semicolon or a comma + conjunction. A comma alone creates a comma splice. Answer: B or C (SAT would present only one correct option).

Question 4:

“The company’s strategic priorities include reducing operational costs, _____, and strengthening customer relationships.”

A) to improve product quality B) improved product quality C) improving product quality D) the improvement of product quality

Rule tested: Parallel structure. Other items use gerund phrases (“reducing” and “strengthening”). Answer: C.

Question 5:

“Each of the students _____ required to submit a final project by the end of the term.”

A) are B) is C) were D) have been

Rule tested: Subject-verb agreement. “Each” is always singular. Answer: B.

Question 6:

“The temperature of the Arctic region is rising faster than _____ of the Antarctic.”

A) the temperature B) those C) that D) it

Rule tested: Logical comparison. Comparing “the temperature” of one region to “the temperature” of another. “That” replaces “the temperature.” Answer: C.

Question 7:

“Dr. Patel ___ published groundbreaking research on climate change ___ has been invited to speak at the international conference.”

A) , who has published groundbreaking research on climate change, (nonessential clause with commas on both sides) B) who has published groundbreaking research on climate change (no commas, essential clause) C) , who has published groundbreaking research on climate change (comma before but not after) D) who has published groundbreaking research on climate change, (comma after but not before)

Rule tested: Nonessential clause punctuation. Dr. Patel is already identified by name, so the clause is nonessential and needs commas on BOTH sides. Answer: A.

Question 8:

“The new policy was implemented _____ the fact that several board members had expressed reservations about its potential consequences.”

A) despite B) in spite of C) regardless of D) notwithstanding

Rule tested: This is more about word choice than grammar. All four options are grammatically acceptable, but the SAT would present choices where some are wordier than others. If one choice were “despite the fact that” and another were simply “despite,” the more concise option would be preferred.

Question 9:

“Before the invention of the printing press, books _____ copied by hand, a process that could take months for a single volume.”

A) are B) were C) had been D) have been

Rule tested: Verb tense. The context is historical (before the printing press), so past tense is appropriate. “Were copied” describes the ongoing practice during that historical period. “Had been copied” would imply the copying was completed before another past event, which is not the meaning here. Answer: B.

Question 10:

“The CEO announced that the company would invest in renewable energy _____ reduce its carbon footprint and attract environmentally conscious consumers.”

A) in order to B) so as to C) to D) for the purpose of

Rule tested: Redundancy/wordiness. All four options convey the same meaning, but “to” (C) is the most concise. “In order to,” “so as to,” and “for the purpose of” are unnecessarily wordy. Answer: C.

The Strategic Approach to Grammar Questions

Strategy 1: Read the Full Passage

Do not read just the sentence containing the blank. Read the entire passage. Context matters for tense consistency, pronoun reference, and logical comparisons. A two-sentence passage might establish past tense in the first sentence, which determines the correct verb form in the second sentence.

Strategy 2: Identify the Rule Before Looking at Choices

Train yourself to identify the grammar rule being tested based on the passage and the nature of the blank. If you know you are looking for subject-verb agreement, you can focus on finding the subject and selecting the correct verb, ignoring distracting elements in the other answer choices.

Strategy 3: Eliminate Wrong Answers by Rule

Each wrong answer violates at least one rule. Identify the violation and eliminate the choice. This is faster than trying to confirm the correct answer, because confirming correctness requires checking all rules, while identifying a single violation is enough to eliminate a choice.

Strategy 4: Trust the Rules Over Your Ear

Casual English allows many constructions that Standard English forbids. “Everyone should bring their notebooks” sounds perfectly natural in conversation but violates pronoun-antecedent agreement in formal Standard English. “Between you and I” sounds sophisticated but is grammatically incorrect (should be “between you and me”). Train yourself to apply rules, not instincts.

Strategy 5: Double-Check Punctuation

Punctuation errors are the easiest to make and the easiest to catch. After selecting your answer, quickly re-read the resulting sentence to verify that all commas, semicolons, and colons are correctly placed. Pay special attention to the boundary between independent clauses.

Strategy 6: Use the Process of Elimination for Tricky Questions

If you cannot identify the specific rule, look at the answer choices and try to find definitive errors in three of them. Even without knowing the rule explicitly, you can often identify incorrect options by recognizing comma splices, fragments, or agreement errors.

Score-Level Strategies for Grammar

Below 500

Focus on the five highest-frequency rules: subject-verb agreement, comma splices, sentence fragments, apostrophe usage (its/it’s, their/they’re), and commas with nonessential clauses. These five rules cover the majority of grammar questions at the easier difficulty levels. Practice 10 questions per day, analyzing every error thoroughly.

At this level, the most impactful habit is learning to identify independent clauses. If you can reliably determine whether a group of words is a complete sentence or not, you can correctly handle comma splices, fragments, run-ons, semicolons, and colons. This single skill underlies at least half of all grammar questions.

500 to 600

Add verb tense consistency, parallel structure, pronoun agreement, and the remaining comma rules. You should be getting 70% to 80% of grammar questions correct at this level. Errors are typically concentrated in two to three specific rules. Identify your weakest rules through practice test analysis and dedicate extra time to those specific rules.

At this level, speed becomes important. You should aim to answer grammar questions in 30 to 45 seconds each. This speed comes from quickly identifying the rule being tested. Practice the “look at what changes” strategy until it becomes automatic.

600 to 700

Master all rules including the less common ones: subjunctive mood, logical comparisons, misplaced modifiers, and redundancy. You should be getting 90% or more of grammar questions correct. Errors at this level are usually from rushing, misreading the passage, or falling for a multi-rule trap.

At this level, develop the habit of checking your answer by re-reading the complete sentence with your choice inserted. This 5-second check catches the occasional error that slips through.

700 to 800

Grammar should be automatic and near-perfect. Focus on the edge cases: sentences where two answers seem grammatically correct (look for subtle wordiness or parallelism differences), multi-rule questions that test two concepts simultaneously, and the rare subjunctive or logical comparison question that catches unprepared students.

At this level, the grammar points you miss are almost always from rushing or from encountering a rule you have not reviewed recently. Keep the rapid-reference table fresh in your memory and slow down enough to apply rules deliberately rather than relying on instinct.

Rapid-Review Reference Table

This table summarizes every rule for quick review before the test.

Subject-Verb Agreement: Singular subjects take singular verbs. Ignore intervening phrases. Watch for inverted sentences, compound subjects, and indefinite pronouns.

Pronoun-Antecedent Agreement: Pronouns must match their antecedents in number. “Everyone” and “each” are singular.

Pronoun Clarity: A pronoun must clearly refer to one specific noun. If ambiguous, replace with the noun.

Pronoun Case: Use subjective case for subjects (I, she, who), objective for objects (me, her, whom). Test compound structures by removing the other person.

Verb Tense Consistency: Maintain the dominant tense unless time changes. Use past perfect for events before other past events.

Subjunctive Mood: Use “were” (not “was”) for hypothetical or contrary-to-fact “if” clauses.

Comma After Introductory Element: Always use a comma after introductory clauses, phrases, and transition words.

Commas With Nonessential Information: Set off nonessential clauses and phrases with commas. Test by removing the phrase.

Commas in Compound Sentences: Use comma + coordinating conjunction between independent clauses. No comma if the second element is not an independent clause.

Commas in Lists: Separate three or more items with commas, including before the final “and.”

Comma Splices: Never join two independent clauses with just a comma. Add a conjunction, use a semicolon, or create two sentences.

Semicolons: Join two related independent clauses. Both sides must be complete sentences.

Semicolons With Transitions: Use semicolon before transitional phrases (however, therefore) that connect independent clauses, followed by a comma after the transition.

Colons: Introduce lists or explanations. The clause before the colon must be a complete sentence.

Apostrophes: Singular possessive: noun + ‘s. Plural possessive: nouns + ‘. Contractions: apostrophe replaces omitted letters.

Its vs It’s: “Its” is possessive. “It’s” means “it is.”

Fragments: Every sentence needs a subject, a main verb, and a complete thought.

Run-Ons: Two independent clauses need proper punctuation or a conjunction between them.

Parallel Structure: Elements in lists and comparisons must be in the same grammatical form.

Dangling Modifiers: The subject after a modifying phrase must be the one performing the action in the phrase.

Misplaced Modifiers: Place modifiers directly next to the word they modify.

Logical Comparisons: Compare like with like. Use “that of” or “those of” to make comparisons parallel.

Redundancy: Choose the most concise option that preserves complete meaning.

Relative Pronouns: “Who” for people, “which” for nonessential clauses about things (with commas), “that” for essential clauses about things (no commas).

Frequently Confused Words: Affect/effect, accept/except, then/than, its/it’s, their/there/they’re, fewer/less.

Frequently Asked Questions

How many grammar questions are on the SAT? Approximately 11 to 13 of the 54 total Reading and Writing questions fall under Standard English Conventions, which tests grammar and punctuation.

What is the single most important grammar rule to learn? Subject-verb agreement is the most frequently tested rule and affects the most questions. If you only have time to study one rule, study this one.

Do I need to know grammar terminology to answer SAT questions? No. You do not need to identify a “dangling participial phrase” by name. You need to recognize that the sentence is structured incorrectly and identify the correction. However, knowing terminology helps you study efficiently because you can look up rules by name.

Is the SAT testing formal or informal English? Formal Standard English. Constructions that are acceptable in casual speech (like using “they” for a singular antecedent or starting a sentence with “But”) may be incorrect on the SAT.

How long does it take to learn all the grammar rules? Two to three weeks of focused daily study (30 to 45 minutes per day) is sufficient for most students to learn all the rules and begin applying them accurately on practice questions.

What is a comma splice and why does the SAT test it? A comma splice is joining two independent clauses with only a comma (no conjunction). It is always incorrect. The SAT tests it because it is one of the most common writing errors.

When do I use a semicolon versus a comma? Use a semicolon between two independent clauses without a conjunction. Use a comma before a coordinating conjunction that joins two independent clauses. Never use a comma alone between two independent clauses.

What is the difference between essential and nonessential clauses? Essential clauses identify or define the noun they modify (no commas). Nonessential clauses add extra information that could be removed without changing the core meaning (set off by commas). Use “that” for essential and “which” for nonessential.

How do I know whether to use “who” or “whom”? “Who” is a subject (substitute “he/she” to test). “Whom” is an object (substitute “him/her” to test).

What is the fastest way to identify the grammar rule being tested? Look at what changes between the answer choices. If verb forms change, it tests agreement or tense. If punctuation changes, it tests punctuation rules. If pronoun forms change, it tests pronoun rules. If word order changes, it tests modifiers or parallelism.

Should I read the full passage or just the sentence with the blank? Always read the full passage. Context from surrounding sentences is essential for tense consistency, pronoun reference, and overall coherence.

What is the most common grammar mistake students make on the SAT? Choosing the answer that “sounds right” instead of applying rules. Casual speech habits lead students to accept incorrect constructions because they hear them frequently.

How many points can I gain by mastering grammar rules? Students who master grammar rules typically gain 40 to 70 points on the Reading and Writing section, making it the highest-return area of study.

Is there a penalty for guessing on grammar questions? No. There is no penalty for wrong answers on the SAT. Always select an answer, even if you are uncertain about the rule.

How do I handle grammar questions when two answers seem correct? Identify the specific rule being tested and apply it strictly. In almost every case, one answer violates a rule and the other does not. If you are comparing two answers that both seem grammatically correct, look for subtle differences in punctuation, word choice, or conciseness. The more concise option is usually correct.

What is the subjunctive mood and how often is it tested? The subjunctive uses “were” instead of “was” for hypothetical situations. It appears on approximately one to two questions per test, typically in “if…were” constructions.

Do I need to know the Oxford comma rule for the SAT? Yes. The SAT uses the Oxford comma (the comma before “and” in a list of three or more items). Always include it.

How do I distinguish between a fragment and a complete sentence? A complete sentence has a subject, a main verb (not inside a dependent clause), and expresses a complete thought. If any of these is missing, the sentence is a fragment.