How to answer ACT function questions

A function question asks what a piece of the passage is doing, not what it is saying. That one distinction fixes most of the misses. The wrong answers are usually accurate summaries of the content, which is exactly why they feel so safe to pick.

How to recognize a function question

The stem asks about purpose or role, usually with language like:

• The reference to the flooded basement primarily serves to
• The second paragraph primarily functions to
• The author includes the story about her grandmother in order to
• The main purpose of the quotation in lines 30 to 34 is to

Another tell: the answer choices start with verbs. Illustrate, undercut, introduce, qualify, emphasize, provide an example of. When the choices are a list of jobs rather than a list of facts, you are being asked about function. These questions live in Craft and Structure, roughly 26 to 33 percent of the Reading section, next to vocabulary in context, tone, and point of view.

A step by step approach

• Read the cited text, then read what comes immediately before and after. Function is always a relationship, so you cannot see it from the cited lines alone.
• Ask what the author was doing in the sentences before. Making a claim? Raising an objection? Setting a scene?
• Then ask what the cited part contributes to that. Does it support, complicate, illustrate, contrast, or transition?
• Predict in plain language, something like it gives an example of the problem she just described.
• Eliminate any choice that only restates content, even if the restating is perfectly accurate.

Right versus tempting: three quick examples

A passage claims that small museums are more inventive than large ones, then spends two sentences on a tiny museum in Ohio that turned its parking lot into an exhibit.

Tempting choice: describe an unusual museum in Ohio. True, and useless, because it tells you what the sentences say. Better choice: provide a concrete example supporting the claim about small museums.

Second example. A passage praising a new bridge design pauses to note that the first version cracked during testing. Tempting choice: explain the technical failure of an early prototype. Better choice: acknowledge a setback before arguing that the design improved. The sentence exists to make the praise credible.

Third example. A paragraph opens with a question. Tempting choice: express the author's uncertainty. Authors who are genuinely uncertain rarely write books about the subject. The likelier function is introduce the issue the rest of the passage will address.

Common traps

• The accurate paraphrase. A choice that describes the content correctly and answers a question nobody asked.
• Too big a job. A single sentence rarely refutes the prevailing scientific consensus. Match the size of the claim to the size of the text.
• The wrong direction. Choices that say challenge when the passage was building support, or support when the author was raising a caveat.
• Content from elsewhere. A choice describing something real in the passage that has nothing to do with the cited lines.

The habit that makes these easy

Function questions reward students who read for structure, tracking why each paragraph exists instead of only what it contains. If you already note the shape of an argument as you read, you are half done before you see the question. That structural habit connects directly to main idea questions, and it is a big part of the best ACT Reading strategy. It also varies by passage genre, since a literary narrative uses details differently than a science article does, which is worth keeping in mind as you review the ACT Reading passage types.

A short drill

Take one passage and, in the margin next to each paragraph, write a two-word verb phrase for what that paragraph does: sets up problem, gives counterexample, narrows claim, ties back. Do not summarize the content. If you can label five paragraphs this way in under three minutes, function questions stop being a separate skill and start being something you already did while reading. thirty-six has ACT-style passages with explanations if you want material to run this drill on repeatedly.

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.