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7. To say that something is not necessary, use needn't or don't have to, not mustn't.

You needn't pay now; tomorrow will be OK. (NOT You m̶u̶s̶t̶n̶'̶t̶ ̶p̶a̶y̶ ̶n̶o̶w̶; tomorrow will be OK.)

I don't have to wear a tie at work. (NOT I m̶u̶s̶t̶n̶'̶t̶ ̶w̶e̶a̶r̶...)

For more details, see Practical English Usage 3rd Edition 366.

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