EN7 Topic Development & Purpose

Purpose questions on the ACT ask you to add, delete, or revise text to meet a stated goal, like 'emphasize the writer's surprise' or 'provide a specific example.' The trick is that the correct answer must do exactly what the question asks, not just sound nice. A reliable tip: reread the goal in the question, then judge each choice only by whether it accomplishes that goal, ignoring whether it's well written. This page explains how to handle add, delete, and 'would this addition' questions in plain language, with free interactive practice modeled on the ACT's wording. You'll learn to match your answer to the specific purpose and to justify keeping or cutting a sentence based on relevance. Work through examples, read the reasoning, and these goal-driven questions stop feeling like guesswork.

A handful of English questions are not about the sentence in front of you at all. They ask what a sentence is doing in the essay: whether to add it, whether to cut it, what would be lost without it, which version accomplishes a stated job. ACT calls this Topic Development, and it is where careful readers give away points — because they answer the question they expect instead of the question on the page.

The one rule that decides almost all of them: the answer never turns on whether a sentence is interesting, well written or true. It turns on whether the sentence does the job the question names. A true, elegant, perfectly grammatical sentence about the wrong subject is wrong.

"Should the writer make this addition?"

Four choices: two begin Yes, two begin No. Students pick the reason that sounds agreeable. Do this instead:

Decide yes or no first, before you read any reason. Ask one question: does this sentence serve the point this paragraph is making? If the paragraph is about a permit process, a fact about soil chemistry belongs only if the paragraph needs it to make sense.
Then test the two reasons on your side. Half of them are false statements about the essay — "because it introduces the paragraph's main idea" when the main idea was stated three sentences ago, or "because it repeats information given earlier" when nothing earlier said it. A reason that misdescribes the passage kills the choice, even if you agree with the yes or the no.

Nearly every wrong choice on these items is wrong in its reason, not in its verdict. That is where you should be spending your attention.

"The essay would primarily lose…"

Cover the choices. Read the sentence in question and ask what it supplies that no other sentence supplies: a specific example, a date, a comparison, a cause, a detail that makes a later pronoun make sense. Then find the choice that names that. Watch for two traps: choices that describe something the sentence mentions rather than what it contributes, and choices that credit the sentence with an opinion when the sentence states a fact.

Goal questions: the stem is the whole item

"Which choice most effectively concludes the paragraph by returning to the comparison in the opening sentence?" That underlined half is not decoration. Three of the four choices will be reasonable sentences; often all four will be true. Only one will do the named job.

Method: read the goal, then write it down in three or four words — return to the comparison. Test each choice against those words alone. Do not ask which sounds best. "Sounds best" is how you end up choosing a graceful sentence that quietly changes the subject.

Relevance

ACT plants sentences that are accurate, nicely written and off the point — a fact about a tree species in a paragraph about permits, a bit of biography in a paragraph about a machine. When a question asks which sentence is least relevant, or whether a sentence should be kept, ask what the paragraph is arguing and whether the sentence advances it. If deleting the sentence costs the paragraph nothing, that is your answer.

Be careful in the other direction too. A sentence can look like a digression and still be load-bearing: if a later sentence says "that reading" or "those two companies," the sentence that supplies the reading or names the companies has to stay.

Whole-essay questions

The last question in a passage is often: "Suppose the writer's goal had been to write an essay that ______. Would this essay accomplish that goal?" Again two Yes choices and two No choices.

Judge the whole essay, not the last paragraph. Ask what the essay is mostly about, in one sentence.
Compare that to the goal. A goal the essay touches once is not a goal the essay accomplishes.
Then check the reason for factual accuracy: choices that say "the essay never mentions X" are frequently false, and choices that say "the essay explains how X works" are frequently false in the other direction — mentioning is not explaining.

These items are slow, and they are meant to be. They are also the items where a student who reads the stem twice beats a student who reads the passage twice.

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Frequently asked questions

How do I answer 'should the writer add this sentence' questions on the ACT?

Decide yes or no first, then match the reason. Keep a sentence if it directly supports the paragraph's point; cut it if it's off-topic or repeats what's already said, even if it's interesting. The correct choice pairs the right decision with an accurate reason, so make sure the 'because' actually describes what the sentence does.

How do I answer questions that give a specific goal on the ACT?

Read the goal carefully, for example 'emphasize the difficulty of the task.' Then check each choice only against that goal. A beautifully written option that doesn't achieve the stated purpose is wrong. The best answer is the one that clearly does the specific job the question names, even if another choice sounds smoother.

When should I delete a sentence on the ACT?

Delete a sentence when it strays from the paragraph's main idea, repeats information, or interrupts the flow without adding anything. Ask what the sentence contributes; if the answer is 'nothing new' or 'it changes the subject,' removing it is usually right. Keep it only when it adds relevant detail, support, or a needed transition.

How do I know if information is relevant on the ACT?

Relevant information supports the specific point the paragraph is making. Locate the paragraph's main idea, then ask whether the detail helps develop that idea. Facts can be true and still irrelevant if they wander off-topic. On the ACT, relevance is about fit with the surrounding point, not about how interesting the fact is.