Definition · Plain-language
SAT grammar rules
The SAT Writing and Language section tests a predictable set of grammar rules. The ten most heavily tested topics are subject-verb agreement, pronoun-antecedent agreement, pronoun case, verb tense consistency, modifier placement, parallel structure, comma usage, apostrophes, word choice and sentence boundaries.
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Topics 1–5: the structure-and-agreement group
These five topics test your understanding of how sentence parts relate to each other. Subject-verb agreement (topic 1): the verb must match its subject in number, not the nearest noun ("the quality of the reports has improved", not "have"). Pronoun-antecedent agreement (topic 2): pronouns must match their antecedent in number ("each student submitted their assignment" is now accepted; "each student submitted their assignments" — check the antecedent). Pronoun case (topic 3): subject form (I, he, she, who) vs object form (me, him, her, whom); test by substituting he/him. Verb tense consistency (topic 4): do not shift tenses without reason — if the passage is in the past, keep it past. Modifier placement (topic 5): dangling and misplaced modifiers confuse who is performing the action; the subject of the main clause must be the intended referent of the introductory phrase.
Topics 6–10: punctuation, style and word choice
Parallel structure (topic 6): items in a list, comparisons and correlative constructions (not only…but also; both…and; either…or) must use the same grammatical form: "She likes running, cycling and to swim" is wrong; "running, cycling and swimming" is parallel. Comma usage (topic 7): comma splice (comma alone between two independent clauses is wrong); comma after introductory clause; commas around non-restrictive elements. Apostrophes (topic 8): its (possessive) vs it's (contraction); your vs you're; plural nouns do not take apostrophes (students, not student's). Word choice (topic 9): commonly confused pairs include affect/effect, fewer/less, who/whom, then/than, complement/compliment. Sentence boundaries (topic 10): identify fragments (dependent clause standing alone) and run-ons (two independent clauses without a separator) — the SAT rewards conciseness, so favour the answer that is grammatically complete and uses the fewest words.
SAT grammar strategy
The SAT Writing and Language section presents passages with underlined portions and asks you to select the best version, including "NO CHANGE". The most effective approach is to read the full sentence before looking at the answer choices, identify the grammatical issue being tested (use the ten topics above as a checklist), then eliminate wrong answers rather than searching for the perfect one. SAT grammar rewards economy: if two answers are grammatically correct, choose the shorter and more direct one. Watch for answer choices that introduce a new error while fixing the one you noticed. For punctuation questions, the mark must be grammatically necessary — if in doubt, less punctuation is usually safer. Practise each topic category separately until you can identify the error type before reading the options.
Key facts
At a glance
- SAT Writing tests: grammar and effective language use, not essay writing
- Topic 1: subject-verb agreement (verb must match grammatical subject)
- Topic 2: pronoun-antecedent agreement (including singular they)
- Topic 3: pronoun case — who (subject) vs whom (object); I vs me
- Topic 4: verb tense consistency — no unmotivated tense shifts
- Topic 5: modifier placement — dangling and misplaced modifiers
- Topic 6: parallel structure in lists and correlative constructions
- Topics 7-8: punctuation — commas and apostrophes
- Topics 9-10: word choice (affect/effect) and sentence boundaries (fragments, run-ons)
Common misconceptions
What people often get wrong
Often heard: The SAT tests obscure, rare grammar rules.
Actually: The SAT Writing section tests a small, predictable set of rules that repeat across every test. Mastering the ten core topics — especially subject-verb agreement, pronouns, parallel structure, comma usage and apostrophes — covers the vast majority of questions.
Often heard: If an answer sounds right, it is correct.
Actually: Many SAT grammar errors are in constructions that sound natural in speech but are grammatically incorrect in formal writing. Relying on instinct alone is unreliable — identifying the grammatical rule being tested and eliminating options that violate it is more reliable.
Often heard: Longer, more detailed answers are better on the SAT.
Actually: The SAT explicitly rewards conciseness. When two answers are grammatically equivalent, the shorter, more direct one is usually correct. Redundant words and wordy phrases are common traps in the Writing section.
Going deeper
