What Are Auxiliary Verbs? Auxiliary verbs are used in conjunction with main verbs to form various tenses, voices, and moods within a sentence. They help to express the time, aspect, and modality of the action being described. Examples of auxiliary verbs include "be," "have," and "do." Types of Auxiliary Verbs There are three main types of auxiliary verbs: primary auxiliaries, modal auxiliaries, and semi-auxiliaries. 1. Primary Auxiliaries The primary auxiliaries include "be," "have," and "do." These verbs can function as both main verbs and auxiliary verbs, depending on the context in which they are used. For example: Be: He is reading a book. (auxiliary) Have: She has finished her homework. (auxiliary) Do: They do not like coffee. (auxiliary) 2. Modal Auxiliaries Modal auxiliaries, also known as modal verbs, include words such as "can," "could," "will," "shall," "may,&