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ACT · English: Usage & Mechanics · Brazil

English: Usage & Mechanics for the ACT Exam — Brazilian candidates

12% of the ACT test plan. ACT English Usage and Mechanics questions test punctuation, grammar, and sentence structure — covering about 40% of the 75-question English section. Calibrated for Brazilian candidates.

Behind every published pass rate is a distribution of which topics caused most of the failures. This is one of those topics. English: Usage & Mechanics sits at roughly 12% of the American College Testing content distribution — Usage and Mechanics is the most rule-based part of ACT English, making it highly learnable in a short time. It covers three domains: punctuation (commas, apostrophes, semicolons, dashes, colons), grammar and usage (subject-verb agreement, pronoun-antecedent agreement, verb tense consistency, modifier placement), and sentence structure (run-ons, comma splices, fragments, parallelism). Students who learn the grammar rules explicitly and practice applying them to ACT-style underlined passages can reliably improve their English scores by 2–4 points. Pass rates for the ACT are published annually by the awarding body and vary by cohort and locale. For Brazilian candidates preparing for ACT, the calibration of study to local context matters: ENEM is Brazil's national entrance exam. For international study, IELTS and TOEFL dominate; CDL US licensure is a growing cross-border opportunity.

Pass rates for ACT (Brazil) are published periodically by the awarding body.

Common failure modes

These are the patterns that cause most candidates to lose marks on this topic. Recognising them in advance is half the work.

  • !Inserting commas by feel ("where I would pause while reading") rather than by rule — ACT tests specific comma rules, not ear-based punctuation
  • !Confusing "its" (possessive) with "it's" (it is) — this appears on virtually every ACT English section
  • !Misidentifying run-on sentences: two independent clauses joined only by a comma constitute a comma splice, not a grammatically correct sentence
  • !Not checking subject-verb agreement when a prepositional phrase separates the subject from the verb ("The results of the experiment [is/are]...")

Study tips

  • 1Learn the six ACT-tested comma rules: (1) with introductory elements, (2) with non-restrictive clauses, (3) with coordinate adjectives, (4) with items in a series, (5) with coordinating conjunctions between independent clauses, (6) NOT between a subject and its verb.
  • 2Memorize the semicolon rule: a semicolon can only join two independent clauses. If either side is not an independent clause, the semicolon is incorrect.
  • 3For pronoun questions, always identify the antecedent before selecting a pronoun. The antecedent must be clear, specific, and grammatically agree in number and gender.
  • 4Practice 20 sentence-structure questions targeting run-ons, comma splices, and fragments — these three error types together account for roughly 15% of English section questions.
  • 5Brazilian candidates preparing for ACT should account for visa-processing timelines if testing abroad — most U.S. test centres require a B1/B2 visa appointment scheduled 90+ days in advance.

Sample ACT English: Usage & Mechanics questions

These sample items mirror the format and difficulty of real ACT questions. Practice with thousands more on the free Koydo question bank.

  1. 1

    Choose the option that best corrects the underlined portion: "The committee, which consists of twelve members agreed to postpone the vote."

    • Amembers, agreedCorrect
    • Bmembers; agreed
    • Cmembers agreed (no change)
    • Dmembers — agreed
    Why this answer?

    "Which consists of twelve members" is a non-restrictive relative clause — it provides extra information but is not essential to the meaning of the sentence. Non-restrictive clauses must be set off by commas on both sides. The clause opens after "committee," so it should close with a comma before "agreed." Option A is correct. (Illustrative.)

  2. 2

    Which of the following correctly uses a semicolon? Choose the version that is grammatically correct.

    • AShe studied for three hours; but still failed the test.
    • BThe results were surprising; the treatment had no measurable effect.Correct
    • CAfter finishing the experiment; the team wrote up the results.
    • DHe was tired; and hungry after the long hike.
    Why this answer?

    A semicolon can only join two independent clauses. In option B, "The results were surprising" is an independent clause, and "the treatment had no measurable effect" is also an independent clause — a semicolon correctly joins them. Options A and D use semicolons before coordinating conjunctions (but, and), which is incorrect. Option C places a semicolon after a subordinate phrase, not an independent clause.

  3. 3

    Select the correct verb form: "Neither the teachers nor the principal [is/are] responsible for the scheduling error."

    • AisCorrect
    • Bare
    • Cwere
    • Dhas been
    Why this answer?

    With "neither...nor" constructions, the verb agrees with the subject closest to it (the proximity rule). The subject closest to the verb is "principal" (singular), so the correct verb is "is." If the construction were reversed ("Neither the principal nor the teachers"), the correct verb would be "are."

  4. 4

    Which sentence contains a dangling modifier?

    • ARunning down the street, the bus was missed by Maria.Correct
    • BHaving finished the report, she submitted it immediately.
    • CWalking to school, Jamie found a lost dog.
    • DTo prepare for the exam, students should review their notes.
    Why this answer?

    "Running down the street" is a participial phrase that must modify the subject of the main clause. In option A, the subject of the main clause is "the bus" — but the bus is not running down the street. This is a dangling modifier. In options B, C, and D, the participial phrase correctly modifies the sentence's subject.

Frequently asked questions

How many questions in ACT English test grammar vs. rhetoric?
ACT English has 75 questions: approximately 40% (30 questions) test Usage and Mechanics (punctuation, grammar, sentence structure) and approximately 35% (26 questions) test Rhetorical Skills (writing strategy, organization, style). The remaining questions are passage-level comprehension items.
Is the ACT English section the same as SAT Writing?
Both test grammar and rhetoric in passage context, but the ACT English section is longer (75 questions, 45 minutes, 5 passages) and includes more pure grammar questions. The SAT Writing section (44 questions, 35 minutes) has more evidence-based reading overlap. Prep materials for one often help with the other.
What is the ACT pass rate for Brazilian candidates?
Pass rates for ACT candidates in Brazil are published periodically by the awarding body. Practice questions, full-length simulations, and weak-area drills are the highest-impact way to improve your odds.
How long should Brazilian candidates study English: Usage & Mechanics for the ACT?
For most candidates, focused mastery of English: Usage & Mechanics requires 20–40 hours of deliberate practice — drilling sample questions, reviewing failure modes, and timing yourself against exam conditions. ENEM is Brazil's national entrance exam. For international study, IELTS and TOEFL dominate; CDL US licensure is a growing cross-border opportunity. Combine English: Usage & Mechanics study with full-length mock exams in the final two weeks before your test date.

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Regulatory citation: ACT Inc. — ACT Test Specifications: English section content areas and question distribution.