The SAT Writing section doesn’t mess around. For Identifying Sentence Errors you had to identify errors in sentences. Care to guess what you have to do for Sentence Improvement questions? That’s right: You have to improve sentences.

Improving Sentences questions consist of a single sentence with one underlined word or phrase. Your mission with that underlined portion of the sentence is twofold. First, you have to figure out if there’s a problem with the underlined part. Then, if there is a problem, you have to decide which answer choice fixes the problem. Sometimes—one-fifth of the time, in fact—no error will exist.