Examples of auxiliary verbs include “be,” “do,” “have,” “will,” “shall,” “may,” “can,” “must,” “ought,” “should,” “could,” and “would.” They indicate tense, aspect, mood, and voice and form questions, negatives, and passive structures. Primary auxiliary verbs include “to be” and “to have.” They are used to indicate tense, voice, and mood.

Three are called primary auxiliaries: to be, to have, and to do. These three words perform special functions. The verb to be forms the passive voice (The ball was hit by John) and the progressive tense (John was hitting the ball). The verb to have forms the perfect tenses (I have decided to retire).

Primary auxiliary verbs include “be,” “do,” and “have,” and they can be linked to form different tenses, voices, and moods. These verbs can also function as action verbs. Most commonly used primary auxiliary verbs in a sentence are be, have, do.