DESCRIPTIONS OF ENGLISH AUXILIARY 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 Continuous (Progressive) Verbs. It is also used with the Past Participle in the Passive
3/ 'HAVE' is used with the Past Participle to form the Perfect Aspect.
We also have an Irregular Verb List, a Phrasal Verb Glossary and an Irregular Verb Viewer you can download.
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