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ACT English & Grammar Reference Cheat Sheet
A printable reference covering ACT punctuation, sentence structure, agreement, modifiers, verb tense, pronouns, concision, transitions, and style for grades 9-12.
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This ACT English and Grammar Reference covers the rules students need most often on the ACT English section. It helps students quickly review punctuation, sentence structure, grammar, usage, and style before practice or test day. The cheat sheet is useful because ACT questions often test the same patterns in different passages. Knowing the rule behind each choice helps students answer faster and with more confidence. The most important concepts include complete sentences, comma and semicolon rules, subject-verb agreement, pronoun clarity, verb tense consistency, and modifier placement. Students should also review concision, transitions, parallel structure, and formal style because the ACT rewards clear, precise writing. A strong answer is usually grammatically correct, logically connected to the passage, and not wordier than necessary. When choices all sound possible, use the rule first, then check meaning and context.
Key Facts
- A complete sentence must have a subject and a working verb and must express a complete thought.
- Use a semicolon to join two closely related independent clauses, as in The results were clear; the team revised its plan.
- Use a comma plus a coordinating conjunction to join two independent clauses, as in The data changed, so the conclusion changed.
- Do not use a comma alone to join two independent clauses because that creates a comma splice.
- A verb must agree with its subject, so a singular subject takes a singular verb and a plural subject takes a plural verb.
- A pronoun must clearly refer to one noun and must agree with that noun in number and person.
- Keep verb tense consistent unless the time of the action clearly changes.
- The shortest grammatically correct answer is often best when it preserves the intended meaning.
Vocabulary
- Independent clause
- An independent clause has a subject and verb and can stand alone as a complete sentence.
- Dependent clause
- A dependent clause has a subject and verb but cannot stand alone as a complete sentence.
- Comma splice
- A comma splice is the incorrect joining of two independent clauses with only a comma.
- Modifier
- A modifier is a word or phrase that describes another word and should be placed next to what it describes.
- Antecedent
- An antecedent is the noun that a pronoun refers to in a sentence.
- Parallel structure
- Parallel structure means using the same grammatical form for items in a list or comparison.
Common Mistakes to Avoid
- Using a comma between two complete sentences is wrong because a comma alone cannot join independent clauses. Use a period, semicolon, or comma plus a coordinating conjunction.
- Choosing a wordy answer because it sounds formal is wrong because the ACT usually prefers clear and concise wording. Remove repeated ideas and unnecessary phrases.
- Ignoring the subject when choosing a verb is wrong because words between the subject and verb can distract from agreement. Find the true subject before selecting the verb.
- Placing a modifier far from the word it describes is wrong because it can create confusing or illogical meaning. Put the modifier next to the noun or action it modifies.
- Picking a transition based only on tone is wrong because transitions must show the correct logical relationship. Check whether the ideas show contrast, cause, example, addition, or conclusion.
Practice Questions
- 1 Choose the correct punctuation: The experiment failed, the team repeated it. Rewrite the sentence in two correct ways.
- 2 Choose the correct verb: The list of supplies are/is on the table.
- 3 Revise for concision: Due to the fact that the weather was rainy, the game was canceled.
- 4 A sentence is grammatically correct but repeats an idea already stated in the paragraph. Explain why the ACT may still prefer deleting or revising it.