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auxiliary verb a verb used in conjunction with a main verb in a clause that assists the main verb in reflecting aspects, voices, moods, and tenses. In the sentence "They have escaped," the main verb is "escaped," and the auxiliary verb is "have."
modal auxiliary an auxiliary verb, such as "can," "may," "must," or "should," that is used to modify the meaning of a main verb by including such notions as necessity, possibility, certainty, capability, advisability, potential, and expectation.