Must, musn't, have to, don't have to

Help

You ____________ apologise; it isn't necessary.

You DON'T HAVE TO apologise; it isn't necessary.

You ______________ tell the boss what happened, or he'll fire you.

You MUSTN'T tell the boss what happened, or he'll fire you.

I ______________ wear a tie; I do it because I like wearing ties.

I DON'T HAVE TO wear a tie; I do it because I like wearing ties.

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