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English definition of “auxiliary verb”

auxiliary verb

noun [C]    
a verb that is used with another verb to form tenses , negatives , and questions . In English the auxiliary verbs are 'be', 'have', and 'do'.Verb forms, tenses and types of verbs
(Definition of auxiliary verb noun from the Cambridge Learner's Dictionary © Cambridge University Press)

Definitions of “auxiliary verb” in other dictionaries

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