ACT English tests a predictable set of grammar rules: punctuation, sentence structure, verb agreement and tense, pronouns, modifiers, and word choice, plus rhetorical skills like organization and concision. The good news? The same rules show up every test, which makes English one of the fastest sections to improve.
Punctuation
Commas, semicolons, colons, dashes, and apostrophes appear constantly. Once you know when a semicolon joins two independent clauses, how colons introduce lists or explanations, and how to spot comma splices, you're already ahead of most students. See punctuation rules to memorize for the full list.
Sentence structure
The ACT loves run-ons and fragments, but they're fixable once you know the pattern. You'll join or split clauses correctly using the four main tools: a period, a semicolon, a comma plus conjunction, and (sometimes) a colon or dash.
Verbs: agreement and tense
Subjects and verbs need to agree in number, even when extra words sit between them. Tense should stay consistent with the surrounding sentences. Watch for tricky subjects hiding behind prepositional phrases; they trip up a lot of students.
Pronouns and modifiers
Pronouns need clear, agreeing antecedents (its vs their). Modifiers should sit right next to what they describe, and dangling modifiers are a favorite ACT trap. You'll see these among the most common question types.
Rhetorical skills
Beyond grammar, expect questions on concision (the shortest correct answer often wins), transitions, adding or deleting sentences, and logical order. When two answers mean the same thing, go with the more concise one.
Drill the rules until they feel automatic
Learning the rules is step one; applying them at speed is step two. Practice concept quizzes on thirty-six and review your misses until each rule clicks. For a faster path up the scale, see how to improve your ACT English score quickly.
Start practicing
Start with a free diagnostic, then drill your weak spots with 15-question quizzes and track how you're doing across Reading, English, and Math. Compare plans whenever you're ready to go further.
This article offers general ACT prep guidance. The ACT can change from year to year, including its format, scoring, policies, test dates, and fees, so always confirm the latest details on the official ACT website at act.org before you make decisions. ACT® is a registered trademark of ACT, Inc. thirty-six is not affiliated with, endorsed by, or sponsored by ACT.