Auxiliary verb

In English, an Auxiliary verb is a verb that changes or helps another verb. Auxiliary means "extra" or "different". Auxiliary verbs like do can be used to make a question. These verbs are usually used with other verbs.
Basic examples.
Below are some sentences that use auxiliary verbs from English, Spanish, German, and French, with the auxiliary verb in bold:
These auxiliaries help make a question, show tense, or make passive voice. Auxiliaries like these usually appear with a normal verb that carries the main meaning of that part of the sentence.