Explanations - 14 - Basics. Common Uses of Auxiliary Verbs.

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Choose the sentence that correctly uses the negative form of "must."

Answers:

You must not be late for the meeting.

You don't must be late for the meeting.

You no must be late for the meeting.

You mustn't be late for the meeting.

The correct sentence uses "mustn't" (must not) to form the negative of "must."