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SAT text structure and purpose: what is this sentence doing?

Some SAT questions ask what a sentence does in the text, not what it says. Learn to label each sentence’s role, follow how a text is built, and choose the answer that describes its function.

SPSAT Practice Editorial7 min read

The short version

What you'll take away

  • Function questions ask what a sentence does: introduce, support, contrast, explain, or conclude.
  • Label each sentence with a short role before reading the choices.
  • The sentences before and after the underlined one usually reveal its function.
In this article

What, not just what it says

Text Structure and Purpose questions, part of the Craft and Structure domain, ask about how a text works. A question might ask for the function of an underlined sentence or for the overall structure of the text.
The right answer usually starts with a verb that describes a job: “It introduces…,” “It provides an example of…,” “It presents evidence that challenges….” Your task is to identify that job.

Label every sentence

Here is a short text written for this article. Each sentence has a different job, and together they form a common SAT pattern: an assumption, a challenge, an explanation, and a conclusion.

See the skill

One text, four jobs

  1. Presents an assumptionFor years, many historians assumed that a medieval town’s wealth came mainly from its wool trade.
  2. Challenges it with evidenceRecent analysis of the town’s tax records, however, shows that most of its income came from tolls on a nearby bridge.
  3. Explains the evidenceThe bridge connected two major trade routes, so nearly every merchant in the region crossed it.
  4. Draws a conclusionThese findings suggest that the town’s location, not its wool, made it rich.
Example text written for practice. The word “however” marks the turn from the assumption to the challenge.

Job words to know

Answer choices describe functions with a small set of verbs. Match the verb to what the sentence actually does in context.

See the skill

What a sentence can do

Introduces

Sets up

Presents a topic, view, or question that later sentences develop.

Illustrates

Gives an example

Makes a general claim concrete with a specific case.

Contrasts or challenges

Pushes back

Offers evidence or a view that disagrees with an earlier one.

Qualifies

Adds a limit

Narrows a claim: “only in some cases,” “at least initially.”

Use the visual as a reasoning aid: tie each choice to the relationship, grammar, or evidence the passage actually gives.

Try one

Use the labeled text above. Look at the second sentence and how it relates to the first.

Your turn

Quick practice

Which choice best describes the function of the second sentence in the text as a whole?

Hint: What does “however” tell you about the relationship between the first two sentences?

Choose one answer

A routine for test day

For function questions, read the whole text and label each sentence in a few words. Then describe the target sentence’s job before you read the choices. For overall-structure questions, read your labels in order. Correct answers often follow that sequence, such as “describes a view, then presents evidence against it.”
  • Read the whole text, not just the underlined sentence.
  • Label each sentence with a short role.
  • Use signal words to find turns and conclusions.
  • Choose the answer whose verb matches the job, not just the topic.

Sources & further reading

One step from here

Put the idea to work.

SAT Practice helps you turn questions into useful feedback, so each session has a next step.

Try a practice set

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