An auxiliary verb helps the main (full) verb and is also called a "helping verb."
With auxiliary verbs, you can write sentences in different tenses, moods, or
voices. Auxiliary verbs are: be, do, have, will, shall, would, should, can,
could, may, might, must, ought, etc.
I think I should study
harder to master English.
I am having a cup of coffee.
You have been practicing
It was written by a
You may choose what you
The verb forms
of be, do, and have can be used either as a main (full) verb or an
auxiliary verb. The following examples show these verbs used as auxiliary