The auxiliary verb also is called a helping verb. For it's used to help form the tenses that are composed of two verbs.
An example is the past tense that's called 'passe compose', or 'composed...
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'want' would be a main verb as it is virtually impossible for an auxiliary to stand alone. Auxiliaries must always occur with a main verb, but main verbs can stand alone. In English, there...
An auxiliary verb comes before the main verb in a sentence.
For example, in the sentence, "He would eat ten hot dogs in this state," would is the auxiliary verb; it comes before eat, which is the...