“Did” is used as an auxiliary verb (or helping verb) in English to form questions, negatives, and emphatic statements in the past simple tense. 1. In Questions Use “did” before the base form of the main verb to form questions in the past. • Did you study for the test? • Did she call you yesterday? • Where did they go last night? 2. In Negative Sentences Use “did not” (or “didn’t”) before the base form of the main verb to make negative statements. • I did not (didn’t) like the movie. • He did not