The verbs be, do, and have. Auxiliary verbs are used with a Main Verb to form the Verb Phrase:
Subject Auxiliary Verb(s) Main Verb
We were walking
He had wanted
You did know
Be, do, and have are different from other auxiliary verbs because they can also be used as main verbs. For example:
In England our weather is always abnormal.
He has a plan.
I did a lot of work with business plans.
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