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What (who) is mustn't - definition

UNINFLECTED VERBS IN ENGLISH

Can't; Couldn't; Shouldn't; Wouldn't; Won't; Would; Should; Needn't; Wouldest; Could; Modal stacking; Canst; Double modal; Shan't; Might could; English modal auxiliary verb; Can (verb); Semi-modal; Cannot; Modal verbs in English; English modal verb; Mustn't; Daren't; Mayn't; Mightn't; Ought to; Oughta; Oughtn't; Had better; Hadn't better; Have to; Has to; Had to; Double modals; Shoud; Had To

mustn't

Mustn't is the usual spoken form of 'must not'.

mustn't

¦ contraction must not.

can't

Can't is the usual spoken form of 'cannot'.

Wikipedia

English modal verbs

The English modal verbs are a subset of the English auxiliary verbs used mostly to express modality (properties such as possibility, obligation, etc.). They can be distinguished from other verbs by their defectiveness (they do not have participle or infinitive forms) and by their neutralization (that they do not take the ending -(e)s in the third-person singular).

The principal English modal verbs are can, could, may, might, shall, should, will, would, and must. Certain other verbs are sometimes classed as modals; these include ought, had better, and (in certain uses) dare and need. Verbs which share only some of the characteristics of the principal modals are sometimes called "quasi-modals", "semi-modals", or "pseudo-modals".

https://en.wikipedia.org/wiki/English modal verbs