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auxiliary verbs | what are auxiliary verbs?
(with examples) auxiliary verbs an auxiliary verb (or a helping verb as it's also called) is used with a main verb to help express the main verb's tense , mood , or voice . the main auxiliary verbs are to be, to have, and to do. they appear in the following forms: to be: am, is, are, was, were, being...
http://www.grammar-monster.com/glossary/auxiliary_verbs.htm