'DO', 'BE' and 'HAVE' are the English auxiliary verbs used in a negative structure, a question or to show tense.
DESCRIPTIONS OF ENGLISH AUXILIARY VERBS:
- 'DO', 'DON'T', 'DOES' and 'DOESN'T' are used for questions and negatives in the Present Simple Tense, and 'DID' and 'DIDN'T' are used in the Past Simple Tense.
- 'BE' is used with the Present Participle in Continuous (Progressive) Verbs. It is also used with the Past Participle in the Passive
- 'HAVE' is used with the Past Participle to form the Perfect Aspect.