No, it is a verb. )
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Doctor DNo, it is a verb. (In rare cases, it is a noun: Wearing clothes is a must.)Yes. Specifically, it is a helping verb (or auxiliary verb). Examples:
Anonymous iNo. It's a modal verb.sIs "must" an adverb?
CalifJimAnd if you want a rather thorough discussion of these speciaAnonymous iThe modal verbs are can, could, shall, should, will, would, may, might, and must.sIs "must" an adverb?