What are the helping verbs in the verb phrases?

Helping verbs (also known as auxiliary verbs) are verbs that come before the main verb in a verb phrase to help express the tense, mood, or voice of the main verb. Examples of helping verbs include "is," "am," "are," "was," "were," "do," "does," "did," "have," "has," "had," "can," "could," "will," "would," "shall," "should," "may," "might," "must," and "ought."