AP English Language Unit 3 Cheatsheet: Evidence and Line of Reasoning

Core principle: Evidence alone is insufficient. Commentary must establish why the evidence matters to your claim.

• Evidence: The specific fact, quote, example, or data you cite
• Commentary: Your explanation of how that evidence supports your claim
• The link: Commentary reveals the logical relationship between evidence and argument

Test yourself: If you removed the commentary, would a reader understand why you included that evidence? If no, you need stronger commentary.

A method of development is how you organize and develop your argument. It helps readers trace your reasoning.

Common methods:

• Narration: Recount a sequence of events, real or imagined; reflect on its significance.
• Cause-effect: Show how one thing causes another; trace consequences
• Comparison-contrast: Show similarities and differences
• Definition: Explain what something means
• Description: Paint a detailed picture

Key insight: The method you choose shapes how readers understand your line of reasoning. Sequence matters—the order of paragraphs reveals your argument's logic.

Commentary is the explanation that connects evidence to your claim. It shows significance and relevance.

What commentary does:

• Explains why the evidence matters
• Shows how it supports your specific claim
• Connects it to your larger argument
• Prevents readers from misinterpreting the evidence

Weak: "Smith says X. This is important."

Strong: "Smith's research shows X, which demonstrates that [your claim] because [logical explanation]."