Modal and auxilaiary:- 7. He ____ have returned by this time.
Answers
He must have returned by this time
Answer: He must have returned by this time. The modal auxiliary verb used in this sentence is "must".
Explanation:
Modal auxiliary verb: One or more auxiliary or aiding verbs frequently come before the main verb in a phrase to make a complete verb. The nine modal auxiliary verbs—can, could, will, would, shall, should, may, might, and must—as well as the forms of "have" (has, had, had), "do" (does, do, did), and "be" (be, am, is, are, were, being, been)—come under the heading of auxiliary verbs.
The base form of a verb is followed by a modal auxiliary verb to express certainty, necessity, or possibility. Modals do not change their form to indicate tense or take a "-s" ending, and neither do the verbs that follow. Only "could," "would," "should," and "might" can be used in the past; all other modal auxiliary verbs must be used in the present.
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