Answer:
An auxiliary verb works with another verb to indicate the tense, the mood, or the voice of the main verb (=the other verb)
Step-by-step explanation:
You can think of the auxiliary verb as a helping verb.
For example, " to be," "to have," and "to do" can be auxiliaries. In the sentence "I am eating an apple", "am" is the auxiliary verb, and "eating" is the main verb.