Helping Verb Definition

'DO', 'BE' and 'HAVE' are the helping   verbs in English; they are used in a negative structure, a question or to show tense.

DESCRIPTIONS OF ENGLISH HELPING VERBS:

1/ '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.

2/ 'BE' is used with the Present Participle in Progressive (Continuous) Verb forms. It is also used with the Past Participle in the Passive

3/ 'HAVE' is used with the Past Participle to form the Perfect Aspect.

Helping verbs are also called auxiliary verbs