AP® English Language and Composition · Big Idea 2
3.A Commentary That Links Evidence to a Claim (CLE-1.K, REO-1.C, REO-1.D)
Commentary is the writer's own sentence explaining why a piece of evidence proves the claim above it. Without it, evidence just sits on the page; the writer has to build the logical bridge by hand.
A quotation or statistic does not explain itself. Drop a number into a paragraph and a reader sees the number, not the argument it is supposed to support. Commentary is the sentence or two where the writer steps in and says, in their own words, why this particular piece of evidence counts as proof of the claim. It builds a logical bridge: evidence sits on one side, claim sits on the other, and commentary is the writer walking the reader across.
Good commentary does two things at once. It has to unpack what the evidence shows, and it has to reconnect that meaning to the exact wording of the claim above it. Skipping either half breaks the bridge. A paragraph that spends its commentary restating the quotation, or reacting to it with outrage, never does the analytical work of saying why the number or quote matters for this claim. A paragraph that explains the evidence in rich detail but never says what it means for the claim leaves the reader to finish the argument alone, which is not the writer's job to hand off.
Inside one paragraph, commentary links evidence to that paragraph's claim. Across a whole essay, the same move has to happen one level up: each paragraph's claim needs commentary that reaches past its own evidence and says what it contributes to the larger argument. An essay can have flawless paragraph-level commentary and still read like a pile of separate points if nothing ever says how paragraph three's finding builds on paragraph two's. The line of reasoning running through an argument is really just commentary operating at a bigger scale, linking claims to claims the way local commentary links evidence to claims.
Key terms
- commentary
- The writer's own sentences explaining why a piece of evidence supports the claim it follows.
- claim
- The arguable statement a paragraph or essay is trying to prove.
- line of reasoning
- The connected chain of claims, each building on the last, that carries an argument across an entire essay.
- restatement
- Repeating what evidence already says in different words, without explaining its significance.
Watch it explained
- How it worksHow does commentary build the logical bridge from one piece of evidence up to the claim above it?
- Worked exampleWalk me through writing commentary that ties a 12 percent dropout figure to a claim about school funding.
- Common mistakeWhy isn't repeating what a quotation already says the same as explaining why it matters?
- Going furtherWhat happens to a paragraph whose commentary explains the evidence beautifully but never names the claim?
- Ties togetherHow does commentary inside one paragraph join the line of reasoning running through a whole argument?
Check yourself
End of topic.