The phrase "must have" is usually regarded as a compound verb, but some grammarians might say that it consists of the active verb "must" and the infinitive verbal "have". ("Must" is one of the few verbs in English for which the word "to" can be omitted in the infinitive form of an immediately following verb.)
The contraction mustn't means "must not."
adverb
what part of speech is beneath
i want to know what part of speech is camping
The part of speech is a adjective
The contraction mustn't means "must not."
part of speech
The part of speech for this particular word is a noun.
The part of speech for "answer" is a noun.
adverb
what part of speech is beneath
The part of speech for "explicit" is an adjective.
The part of speech for "twirl" is a verb.
The part of speech for "unfamiliar" is an adjective.
The part of speech of "came" is a verb.
The part of speech for "lecturer" is a noun.
The part of speech for "indefinite" is an adjective.