” Also called auxiliary verbs, they help the main verb in a sentence form questions, negatives, and some verb tenses. The general rule is that when a helping verb is used in a sentence, it is the helping verb that takes the tense, while the main verb takes its base form (the infinitive of the verb without the “to,” as in “make” from the infinitive “to make”). “Do” in particular is used to (a) indicate questions, (b) indicate the negative of a statement, and (c) emphasize a statement.
New words, one handy idiom, and a 2-minute quiz — delivered to your inbox to keep your streak alive.
AnonymousWhy we have used "have" after did not as "she" is a singular person ?Because the word "did" is there.