Week 3, Session 1: Text Structure and Author Purpose
SAT® Reading & Writing 2026: Complete 8-Week Self-Study System · preview lesson
Learning Objectives
Identify the organizational structure of an SAT® passage, determine the rhetorical function of individual sentences, and answer "author's purpose" questions with precision.
---
Why Structure Questions Appear on the SAT®
SAT® R&W tests whether you understand not just what a passage says but how it is organized and why each part exists. Structure questions come in several forms:
- "Which choice best describes the overall structure of the text?"
- "What is the function of the underlined sentence?"
- "Why does the author include [specific detail]?"
---
Four Common Passage Structures
| Structure | Pattern | Signal Words |
|---|---|---|
| Problem → Solution | States an issue, then offers a fix | "To address this…" / "One approach…" |
| Claim → Evidence → Significance | Makes a claim, supports it, explains why it matters | "The researchers found… This suggests…" |
| Compare and Contrast | Presents two sides or two phenomena | "While…" / "By contrast…" / "Unlike…" |
| Chronological / Sequential | Events unfold in time order | "First… then… finally…" / dates and sequence markers |
---
Sentence Function Categories
| Function | What it does | Typical Position |
|---|---|---|
| Introduces the topic or problem | Sets the scene or raises the question | First sentence |
| Presents evidence or data | Provides support for a claim | Middle sentences |
| Qualifies or limits the claim | Adds a "but" or "however" restriction | Often penultimate |
| States the significance | Explains why the finding matters | Often last sentence |
| Provides an example | Illustrates an abstract claim concretely | After a claim |
| Defines a term | Clarifies specialized vocabulary | Near the term's first use |
---
Worked Example
Passage: Researchers studying urban bird populations noticed an unexpected pattern: species richness in city parks correlated more strongly with park connectivity than with park size. A greenway linking a small park to a larger one increased recorded species diversity by 19 percent, even without adding new vegetation. Although the mechanism is not fully understood, the researchers suggest that connected corridors allow mobile species to exploit multiple habitat patches as a single extended range. This finding implies that urban planners can improve biodiversity outcomes through connectivity investments rather than costly land acquisition.
Question: What is the function of the final sentence?
| Choice | Verdict |
|---|---|
| A. It explains why park size affects species richness. | ✗ — Contradicts (the passage de-emphasizes size) |
| B. It states the practical implication of the research finding. | ✓ — The final sentence moves from finding to application |
| C. It introduces a new, unrelated topic. | ✗ — It follows directly from the preceding argument |
| D. It defines the term "connectivity." | ✗ — No definition is given |
Answer: B — The passage ends with "This finding implies…" which signals significance and application.
---
Strategy for Structure and Purpose Questions
- After reading the passage, mentally label each sentence with its function (sets up problem / gives evidence / qualifies / concludes).
- For "function of a sentence" questions, predict what the sentence does, not just what it says.
- Wrong choices often describe a different sentence's function — read them against the correct sentence, not the passage in general.
[[check:What are the four most common SAT® passage structures?|problem-solution, claim-evidence-significance, compare-contrast, chronological|Recognizing the structure early helps you predict the function of individual sentences.]]
[[check:If a sentence begins with 'This finding implies,' what function does it likely serve?|states significance or practical implication|Phrases like 'this suggests,' 'this implies,' and 'this finding indicates' signal a conclusion about why the result matters.]]
No teacher notes have been added for this session.
No additional resources have been added for this session.
Lesson Discussion
Ask a question about this lesson. A teacher or admin can answer here.
Sign in to ask a question or save this lesson.
No questions yet for this lesson.