Auxiliary Verbs

Auxiliary verbs are also known as helping verbs because they help to form the different verb tenses and moods in English. 

The most common auxiliary verbs are:

to be
to have
to do
modal verbs 

Examples of the auxiliary verbs being used to form verb tenses.

auxiliary verbs

AUXILIARY VERBS & CONTRACTED FORMS

In both spoken and written English auxiliaries are often contracted. 

TO BE

Present 

Past

TO HAVE

Present

Past

TO DO

Present

Past

MODAL VERBS

*only will and would have other contracted forms :

More on Modal Verbs

Note 
these contracted forms have two different long forms and meanings:
    he’s = he is or he has
    he’d = he had or he would

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