Auxiliary Verbs are the verbs be, do, have, will when they are followed by another verb (the full verb) in order to form a question, a negative sentence, a compound tense or the passive.
The verb "be"
The verb be can be used as an auxiliary and a full verb. As an auxiliary we use this verb for compound tenses and the passive voice. Note that be is an irregular verb:
1. Simple Present:
I am, he/she/it is, we/you/they are
2. Simple Past:
I/he/she/it was, we/you/they were Auxiliary Verbs are the verbs be, do, have, will when they are followed by another verb (the full verb) in order to form a question, a negative sentence, a compound tense or the passive.
The verb "be"
The verb be can be used as an auxiliary and a full verb. As an auxiliary we use this verb for compound tenses and the passive voice. Note that be is an irregular verb:
Simple Present:
I am, he/she/it is, we/you/they are
Simple Past:
I/he/she/it was, we/you/they were
Past Participle:
Been
You can tell that in the following sentences be is an auxiliary because it is followed by another verb (the full verb). (For progressive forms use the "-ing" form of the full verb; for passive voice, use the past participle of the full verb.)