A function-of-a-sentence question asks what that sentence is doing in the paragraph, not what it says on its own. Paragraph jobs as a set are in paragraph jobs.
Job, not paraphrase
Introduce, illustrate, contrast, concede, or conclude. If a choice restates the sentence, it is usually too narrow. Detail questions want the fact, in detail questions.
The author's purpose for the whole passage is a wider lens, in author's purpose. Tone is in author's attitude.
The bottom line
Name the job in the paragraph. A restatement of the sentence is not the function.
Start practicing
Start with a free diagnostic, then drill your weak spots with 15-question quizzes and track how you're doing across Reading, English, and Math. Compare plans whenever you're ready to go further.
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.