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auxiliary verb

 noun
     
Related topics: Grammar
auxiliary verb [countable]
SLG a verb that is used with another verb to show its tense, person, mood etc. In English the auxiliary verbs are 'be', 'do', and 'have' (as in 'I am running', 'I didn't go', 'they have gone') and all the modals
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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