As such, it is usually used with an auxiliary verb.

In modern English, the auxiliary verb for forming the present perfect is always to have.

A subject usually comes before a verb, but it can also come after auxiliary verbs.

They are used as auxiliary verbs only and always need a main verb to follow.

Siri is no longer in use as an auxiliary verb.

In the sentence above, both rules yield the same result since there is only one auxiliary verb.

In addition, there are four past tense structures which include auxiliary verbs.

The main differences between the various proposed sets of auxiliary verbs are noted below.

The literature on auxiliary verbs is somewhat inconsistent in this area.

The future in Creole is expressed with the auxiliary verb "to go".