Use 'mustn't' in a sentence to indicate something that is ...

★ Modal Verbs for Permission and Obligation

Use ‘mustn’t’ in a sentence to indicate something that is not allowed.

A. You mustn’t park here.

B. You mustn’t use your phone during class.

C. You mustn’t run in the hallways.

D. You mustn’t eat here.

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Formulate a sentence using ‘may’ to ask for permission.

A. May I go to the store?

B. May I turn off the lights?

C. May I leave the room?

D. May I have a cookie?