Verb groups such as "gives," "took," "has made," which are used when the subject of the verb is the person or thing doing the action or responsible for it
An adverb, or an adverb phrase, prepositional phrase, or noun group, which does the same job as an adverb, giving more information about when, how, where, or in what circumstances something happens
One of the verbs "be," "have," and "do" when they are used with a main verb to form tenses, negatives, and questions. Some grammars include modals in the group of auxiliary verbs.