a conjugated verb used in front of another verb in compound tenses in order to help form the mood and tense of the verb
a helping verb used to express tense , mood , or voice
a verb that accompanies the main verb in a clause and helps to make distinctions in mood, voice, aspect, or tense
a verb that is used to form the tense or time of action, voice and mood of another verb
A verb that is used before main verbs (or other auxiliary verbs) in a sentence. Auxiliary verbs are usually used in questions and negative sentences. Do, have, and be can act as auxiliary verbs. Modals (may, can, will, and so on) are also auxiliary verbs e.g. Do you have any change? The camera was taken.
in the following example - Researchers have studied... - the auxiliary verb is has
These verbs, be, have, do are helping verbs, which are normally used with other verbs to create negatives and questions.
A verb that combines with the main verb to show differences in tense, person, and voice. The most common auxiliaries are forms of be, do, and have am going; we did not go; they have gone. (See also modal auxiliaries. )
A verb, such as have, can, or will, that accompanies the main verb in a clause and helps to make distinctions in aspect, mood, tense, and voice.
A verb that is used with a main verb. Be, do and have are auxiliary verbs. Can, may, must etc are modal auxiliary verbs.
In linguistics, an auxiliary (also called helping verb, auxiliary verb, or verbal auxiliary) is a verb functioning to give further semantic or syntactic information about the main or full verb following it. In English, the extra meaning an auxiliary verb imparts alters the basic form of the main verb to have one or more of the following functions: passive, progressive, perfect, modal, or dummy.