Mastering the ACT English Section: A Comprehensive Guide to Grammar, Rhetoric, and Style

The Foundations of ACT English

The ACT English test is a 75-question, 45-minute exam that assesses two primary domains: Knowledge of Language and Conventions of Standard English. Unlike a traditional spelling bee or a creative writing class, this section focuses on your ability to edit and revise existing texts to ensure clarity, flow, and grammatical accuracy. To succeed, you must shift your perspective from that of a reader to that of an editor.

At its core, the ACT English section tests how well you understand the relationships between words in a sentence and the relationships between sentences in a paragraph. It is not about knowing obscure vocabulary; it is about recognizing the structured logic that governs the English language. Every question has a single, objectively correct answer based on a specific set of rules. This guide will walk you through those rules, beginning with the structure of the sentence itself.

Exam Focus

Typical question patterns: In most questions, you will see a portion of a passage underlined. You must determine if that portion is correct as-is or if one of the three alternatives provides a better version. About 10-15% of the questions will not underline a specific word but will instead ask about the placement of a sentence or the overall goal of the passage.
Common mistakes: Many students rely on "how the sentence sounds" in their head. This is risky because conversational English often breaks formal rules. You must learn the formal conventions, as the ACT frequently uses "sounding right" as a trap to disguise a grammatical error.

Sentence Structure and Punctuation

A sentence is more than just a string of words; it is a vehicle for a complete thought. To build a sentence, you need at least one independent clause, which consists of a subject and a verb and can stand alone. Problems arise when students fail to distinguish between independent clauses and dependent clauses (which cannot stand alone) or fragments (which lack a subject or a verb).

The Mechanics of Connecting Clauses

One of the most frequent concepts on the ACT is the "Comma Splice" and the "Run-on Sentence." These occur when two independent clauses are joined incorrectly. To join two independent clauses, you have only four legitimate options:

Period: Separate them into two distinct sentences.
Semicolon: Use a semicolon (;) to signal that the two thoughts are closely related.
Comma + Coordinating Conjunction: Use one of the seven "FANBOYS" (For, And, Nor, But, Or, Yet, So).
Colon: Use a colon (:) if the second clause explains or expands upon the first.

If you see two complete thoughts separated by only a comma, it is an error. Likewise, if there is no punctuation at all between them, it is a run-on. Understanding this hierarchy allows you to eliminate dozens of wrong answer choices quickly.

Commas and Non-Essential Elements

Comma usage is perhaps the most confusing part of the English section because commas serve multiple masters. Beyond joining clauses with a conjunction, commas serve to set off non-essential elements (also called appositives or parenthetical phrases). A non-essential element is a piece of information that adds detail but is not required for the sentence to remain grammatically complete and logically sound.

Consider the sentence: "The scientist, who had won several awards, began her lecture." If you remove "who had won several awards," the sentence still makes sense: "The scientist began her lecture." Because the information is extra, it must be "hugged" by two commas. If the information is essential to the meaning, however, no commas are used. For example, in "The city of Paris is beautiful," you cannot remove "of Paris" without losing the identity of the subject, so no commas around the city name are allowed.

Colons and Dashes

Colons and dashes often intimidate students, but their rules are actually quite rigid. A colon (:) must follow a complete independent clause. What follows the colon can be a list, a single word, or another full sentence, provided it helps to clarify or define the preceding clause. For example: "She had only one goal: victory."

An em-dash (—) functions similarly to a colon or a pair of commas. A single dash can introduce a concluding thought or an abrupt change in tone, while a pair of dashes can set off a non-essential phrase just like commas do. The key is consistency: you cannot start a parenthetical phrase with a comma and end it with a dash. They must match.

Exam Focus

Typical question patterns: Questions will frequently offer four versions of the same sentence with different punctuation marks (e.g., one with a semicolon, one with a comma, one with a colon). You must identify where the independent clauses start and stop to choose the right one.
Common mistakes: Many students put commas wherever they would take a breath while speaking. The ACT does not care about your breathing patterns; it cares about the structural relationship between nouns and verbs. Avoid placing commas between a subject and its verb or between a verb and its object.

Verbs: Agreement and Tense

Verbs are the engine of the sentence, and they must be calibrated correctly to match their subjects. There are two main ways a verb can go wrong on the ACT: Subject-Verb Agreement and Tense Consistency.

Subject-Verb Agreement

A singular subject requires a singular verb, and a plural subject requires a plural verb. This sounds simple, but the ACT purposefully creates distance between the subject and the verb to confuse you. This is often done using a prepositional phrase or a non-essential element.

Example: "The collection of rare stamps, including several from the nineteenth century, is/are very valuable."

In this case, the subject is "collection" (singular), not "stamps" or "century." Therefore, the correct verb is "is." When you encounter a verb question, your first step should always be to identify the true subject by crossing out any fluff in between.

Verb Tense and Mood

Consistency is the gold standard for verb tense. If a passage begins in the past tense, it should generally remain in the past tense unless there is a logical reason to shift (such as a transition to a modern-day reflection). You must look at the surrounding sentences to determine the established "time signature" of the passage.

Furthermore, be wary of the conditional mood. When describing hypothetical situations, use "would" rather than "will." For example, "If I were to go to the store, I would buy milk." Note the use of "were" instead of "was"—this is the subjunctive mood, used for contrary-to-fact statements.

Exam Focus

Typical question patterns: A singular verb will be swapped for a plural one, or a past tense verb will be swapped for a present-progressive one. You will be asked to choose the form that fits the grammatical context.
Common mistakes: Students often get confused by collective nouns (like "group," "team," or "committee"), which are singular, and indefinite pronouns (like "each," "everyone," or "neither"), which are also singular. Treat these as "it," not "they."

Pronouns: Clarity and Case

Pronouns stand in for nouns (the antecedent). To use a pronoun correctly, two things must be true: the pronoun must clearly refer to a specific noun, and it must be in the correct "case."

Pronoun-Antecedent Agreement

Just like verbs, pronouns must match their nouns in number and gender. If you are talking about a "company," you must refer to it as "it," not "they." Even though a company is made of people, the entity itself is singular. The ACT loves to test this by using plural-sounding nouns that are grammatically singular.

Pronoun Case: Subjective vs. Objective

Case refers to how the pronoun is used in the sentence.

Subjective Case (I, you, he, she, it, we, they, who): Used when the pronoun is doing the action.
Objective Case (me, you, him, her, it, us, them, whom): Used when the pronoun is receiving the action or follows a preposition.

If you are unsure whether to use "I" or "me" in a compound phrase like "The teacher called Sarah and I/me," try removing the other person. You wouldn't say "The teacher called I," so you must say "The teacher called Sarah and me."

Who vs. Whom

This is a common point of anxiety. Use "who" as a subject (acting like "he" or "they") and "whom" as an object (acting like "him" or "them"). If you can replace the word with "him," use "whom." If you can replace it with "he," use "who."

Exam Focus

Typical question patterns: Ambiguous pronoun references are common. If a sentence says, "John and Bob went to the store, and he bought a soda," it is unclear who "he" is. In these cases, the correct answer usually replaces the pronoun with the specific name.
Common mistakes: Misusing "its" and "it's." "Its" (no apostrophe) is possessive, like "his" or "hers." "It's" is a contraction for "it is." This is a favorite trick on the ACT.

Rhetorical Skills: Transitions and Strategy

The second half of the ACT English section moves away from technical grammar and into the realm of Rhetorical Skills. These questions ask you to think like an author. They deal with how ideas flow and whether specific information should be added or deleted.

Mastery of Transitions

Transitions act as the glue between thoughts. To choose the right transition, you must identify the logical relationship between the two ideas being connected. There are three main types:

Addition/Continuity: These indicate that the next idea continues in the same direction (e.g., "Furthermore," "Moreover," "In addition," "Similarly").
Contrast: These indicate a change in direction or a conflict (e.g., "However," "Nevertheless," "Conversely," "On the other hand").
Cause and Effect: These indicate that one idea led to the next (e.g., "Therefore," "Consequently," "As a result").

If the passage presents a theory and then provides proof, use "For example." If it presents a theory and then shows why it is wrong, use "However."

Addition, Deletion, and Placement

Some questions will ask if a sentence should be added or deleted. To answer these, ask yourself: "Does this information provide necessary context or does it distract from the main point?" The ACT values conciseness. If a sentence repeats information already stated or goes on a tangent about a related but irrelevant topic, delete it.

Placement questions ask where a sentence or paragraph should be moved to improve logic. Look for clue words like "This discovery" or "These results." These words imply that the discovery or results were mentioned in the immediately preceding sentence.

Conciseness and Redundancy

The ACT has a strong bias toward the shortest answer that is grammatically correct and retains the original meaning. If two answers have the same meaning, and both are correct, choose the shorter one. Avoid redundant phrasing like "annual anniversary" (anniversaries are by definition annual) or "return back" (returning implies going back).

Exam Focus

Typical question patterns: "The writer is considering deleting the underlined sentence. Should the writer do this?" You must choose "Yes" or "No" based on whether the sentence supports the primary purpose of the paragraph.
Common mistakes: Many students try to add more "fancy" words or longer sentences, thinking they sound more academic. On the ACT, simple and direct is almost always better.

Modifiers and Parallelism

To ensure a sentence is professional and clear, its parts must be properly aligned. This involves placing modifiers next to the things they modify and maintaining a consistent structure in lists.

Misplaced and Dangling Modifiers

A modifier is a descriptive phrase. To avoid confusion, the modifier must be placed immediately next to the person or thing it is describing.

Consider the error: "Howling at the moon, the hiker saw a pack of wolves." This sentence suggests the hiker was howling. To fix it, you must move the hiker away: "The hiker saw a pack of wolves howling at the moon."

A dangling modifier occurs when the subject being described is missing entirely. "Walking to the store, the rain started falling." The rain wasn't walking to the store. You would need to rewrite it as: "While I was walking to the store, the rain started falling."

Parallelism

Parallelism requires that items in a list or comparison follow the same grammatical format. This creates a rhythm and makes the text easier to process.

Incorrect: "She likes hiking, swimming, and to ride bikes."
Correct: "She likes hiking, swimming, and bike riding" (or "to hike, to swim, and to ride bikes").

If you see a list of three things, check the ending of each word. If two end in "-ing," the third one must also end in "-ing."

Exam Focus

Typical question patterns: You will be given a list or a comparison where one part doesn't match the others. You must pick the option that restores the pattern.
Common mistakes: Overlooking parallelism in comparisons. For example, "The results of the first study were more conclusive than the second study." This is a false comparison because you are comparing "results" to a "study." It should be: "…than those of the second study."

Final Strategy for Test Day

The ACT English test is as much about pacing as it is about grammar. With 75 questions in 45 minutes, you have roughly 36 seconds per question. However, many questions take only 10 seconds (like simple comma checks), giving you more time for the complex rhetorical questions.

The "No Change" Trap
Option A is always "NO CHANGE." While it is correct about 25-30% of the time, students often choose it when they are unsure or tired. Always test at least one other option to see if it fixes a subtle error you might have missed on the first pass.

The Context Rule
Never look at a question in isolation. Sometimes the answer to a question in the first paragraph depends on a piece of information revealed in the third paragraph. Read the whole passage, not just the underlined bits.

By understanding these core principles—structural integrity, subject-verb-pronoun agreement, and rhetorical logic—you can approach the ACT English section with the confidence of an expert editor. Focus on the rules, ignore the "sounds," and look for the most concise, logical path forward.