Last updated July 07, 2026 · Reviewed by the AnvayaPrep team
Introduction
Form, Structure, and Sense is the unit covering the grammatical correctness of word forms and internal sentence consistency. While the Boundaries unit addresses where sentences start and stop, this unit addresses whether the individual words within sentences have the correct grammatical form and whether grammatical elements agree with each other. The unit's 30 topics span subject-verb agreement (including agreement with intervening phrases, compound subjects, collective nouns, indefinite pronouns, and prepositional phrase traps), verb form and consistency (verb tense, verb mood, verb voice, tense sequence, verb consistency), modifiers (dangling modifiers, misplaced modifiers, modifier errors), structural consistency (parallel structure, comparisons, logical predication), pronoun form and agreement (pronoun case, pronoun antecedent agreement, pronoun clarity), possessives and contractions (possessive nouns, apostrophes, plural nouns), and frequently confused word pairs (subject-verb agreement, affect vs. effect, fewer vs. less, which vs. that, who vs. whom, their/there/they're, its/it's).
Learning Objectives
- Apply subject-verb agreement rules across complex sentence structures: identify the true subject despite intervening prepositional phrases, compound subject constructions, collective nouns, and indefinite pronouns
- Maintain verb tense consistency within and across sentences, and apply correct tense sequencing when multiple time frames are present
- Recognize and correct verb mood errors: distinguish indicative (statements of fact), subjunctive (hypothetical or contrary-to-fact conditions), and imperative (commands)
- Identify and correct dangling and misplaced modifiers by ensuring every modifying phrase is adjacent to and logically connected to what it modifies
- Maintain parallel structure: items in a list or joined by correlative conjunctions must share the same grammatical form
- Apply correct pronoun case (subject case: I, he, she, they, we, who; object case: me, him, her, them, us, whom) and ensure pronouns agree with their antecedents in number and gender
- Recognize and correct logical predication errors where the grammatical subject of a sentence cannot logically perform the verb assigned to it
- Use the correct form for frequently confused word pairs
High-Yield Concepts
| Concept | What It Tests | Key Strategy |
|---|---|---|
| Subject-verb agreement | Matching singular/plural verb form to the true subject | Cross out intervening phrases; identify the core subject and match the verb to it |
| Agreement with intervening phrases | Not being distracted by nouns in intervening prepositional phrases | The object of a preposition is never the subject; ignore phrases between subject and verb |
| Verb tense | Selecting the correct tense given the time context | Identify time markers (yesterday, since, by 2020); match tense to the time frame |
| Verb consistency | Not shifting tense without reason | If the passage is in past tense, all verbs should be past unless a different time frame is explicitly signaled |
| Parallel structure | Matching grammatical form across listed or contrasted items | All items in a list must share the same form: all nouns, all verb phrases, all infinitives, etc. |
| Pronoun case | Using subject case (I, who) vs. object case (me, whom) | Test: substitute "he/him" or "she/her"; whichever sounds right indicates subject (he = I/who) or object (him = me/whom) case |
| Dangling modifiers | Ensuring introductory phrases modify the sentence's subject | The noun after an introductory phrase is what the phrase modifies; it must be the logical performer |
| Comparisons | Making grammatically parallel and logically complete comparisons | Compare like to like: "The test scores of Group A are higher than those of Group B" not "higher than Group B" |
| Apostrophes | Distinguishing possessives from contractions and plurals | Possessives: noun's (singular), nouns' (plural); contractions: it's = it is; plurals: no apostrophe |
| Frequently confused words | Selecting the correct word from a confusing pair | Know the specific distinction for each pair: affect (verb/effect on) vs. effect (noun/result) |
Study Strategy
The most efficient path through this unit starts with subject-verb agreement since it is the most frequently tested topic. Study the basic rule first, then study the four traps: intervening prepositional phrases, compound subjects, collective nouns, and indefinite pronouns. These four traps account for the vast majority of SAT subject-verb agreement questions.
Next, study verb tense and verb consistency as a pair, then add verb mood (especially the subjunctive for hypothetical conditions using "were" rather than "was"). Then study parallel structure, which is the most frequently tested structure topic after subject-verb agreement.
After the verb and structure topics, work through the pronoun topics: pronoun case, pronoun antecedent agreement, and pronoun clarity. These three are closely related. Finally, study the modifier topics (dangling and misplaced) and the apostrophe/possessive rules, then finish with the frequently confused word pairs.
Common Mistakes
Being distracted by nouns between the subject and verb. The most common subject-verb agreement trap is a prepositional phrase between the subject and verb: "The results of the experiment was unexpected" (was should be were, because the subject is "results," not "experiment"). Always identify the true subject by crossing out the intervening phrase.
Shifting verb tense without a logical reason. Students sometimes change from past to present tense within a single passage without any change in time frame. Maintain consistent tense unless the passage explicitly introduces a different time period.
Using "was" for hypothetical or contrary-to-fact conditions. The subjunctive requires "were" for conditions that are not true or not yet true: "If I were the president..." and "She wished she were taller" are correct. "If I was the president" is a common error in this context.
Failing to maintain parallel structure in lists. "She enjoys hiking, to swim, and running" is non-parallel. All items must match: "She enjoys hiking, swimming, and running" or "She enjoys to hike, to swim, and to run." The most common non-parallel pattern is mixing gerunds (swimming) with infinitives (to swim) or noun phrases with verb phrases.
Confusing "who" (subject case) with "whom" (object case). The substitution test helps: replace with "he/him." If "he" works, use "who." If "him" works, use "whom." "Who called?" = "He called" (subject case). "Whom did you call?" = "You called him" (object case).
Exam Tips
For subject-verb agreement questions, draw a line through every phrase between the subject and the verb. What remains is the core sentence: "[Subject] [verb]." Now check whether the verb agrees with the remaining subject in number. This simple technique eliminates the most common distractor in SAT agreement questions.
Do not use the apostrophe for plurals. "The 1990's" and "The CEO's attended" are both wrong. Plurals do not use apostrophes: "The 1990s" and "The CEOs attended." Apostrophes indicate possession (the CEO's decision) or contraction (it's = it is). This is one of the most common written errors and a high-frequency SAT trap.
For the who/whom distinction, use the HE/HIM trick: substitute "he" and "him" in the clause where who/whom appears. If "he" fits (subject role), use "who." If "him" fits (object role), use "whom." This works because both are subject-case (he/who) and object-case (him/whom) pairs respectively.
For parallel structure questions, identify all items in the list or contrast and verify that they all use the same grammatical form. If one item begins with a gerund (-ing form), all items should. If one begins with an infinitive (to + verb), all items should. If one is a noun phrase, all items should be noun phrases. The shortest test: read each item in the list independently and ask if it could stand in place of any other item with the same framing.
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