Form, Structure, and Sense — Best-Guess Strategies

How to Approach It

Hard FSS items are mechanical exercises. The right way to break a tie is to apply rule-based checks in order, not to read the sentence aloud and hope a reading sounds right. When you are unsure, the routine has five steps: strip the sentence to its skeleton, identify the true subject and verb, check agreement, check pronoun reference, and check parallelism or modifier placement. The order matters; checks done out of order often miss errors that an earlier check would have caught.

Step one is to strip the sentence to its skeleton. Cross out all prepositional phrases ('of the data,' 'in the lab,' 'from the field'), all interrupters set off by commas or dashes, and all introductory phrases. What remains is the bare subject, verb, and object. Many FSS errors become obvious once the sentence is stripped: the buried singular subject suddenly stands next to a plural verb, or the bare subject reveals a tense or aspect mismatch. Stripping is the single most important habit for hard FSS items.

Step two is to identify the true subject. The true subject is the noun the verb refers to, not the noun closest to the verb. Watch for 'collection of,' 'group of,' 'set of,' 'list of,' 'each of,' 'one of,' 'either of,' 'neither of,' 'none of' — these constructions usually take singular verbs even when followed by plural nouns. Watch also for collective nouns (committee, team, family) that take singular verbs in standard American usage. Identifying the true subject before checking the verb prevents most agreement errors.

Step three is to check agreement between the true subject and the verb. The verb's number (singular or plural) must match the subject's. The verb's person (first, second, third) must also match. The check is mechanical: count the subject as one item or many, and choose the verb form accordingly. When choices include several verb forms in different tenses or aspects, narrow first by number and person, then refine by tense.

Step four is to check pronoun reference. Every pronoun (he, she, it, they, this, that, which, who, them) should have one and only one clear antecedent. Circle each pronoun and draw an arrow to its antecedent. If the arrow is ambiguous (two possible antecedents), the pronoun is wrong as written. If the arrow points to nothing (no clear antecedent), the pronoun is wrong as written. The correct answer will either replace the pronoun with a noun or rewrite the sentence so the antecedent is unambiguous.

Step five is to check parallelism and modifier placement. Scan for any 'and,' 'or,' 'but,' or 'than' — these conjunctions almost always require parallel structure on both sides. Then scan for introductory phrases (especially -ing phrases) and check whether the main clause's subject is what the phrase modifies. Misplaced or dangling modifiers are common on hard FSS items, especially in passages that begin with descriptive opening phrases.

When two choices remain and both seem grammatically defensible, prefer the one that uses the simplest verb form, the clearest pronoun reference, and the most direct modifier-to-noun connection. SAT writers prefer simple, direct sentences. Compound or perfect-aspect forms are correct only when the timeline requires them. Passive voice is correct only when the agent is genuinely unimportant or unknown. When in doubt, choose the simpler, more direct construction. The practice questions below model the routine on items where two choices look plausible at first.

Example Questions