Must and Have To
Help
You ___ apologise; it isn't necessary. (don't have to OR musn't)
don't have to
I ____ wear a tie; I do it because I like wearing ties. (don't have to OR musn't)
don't have to
I _____ be late. It's the most important meeting of the year. (don't have to OR musn't)
musn't
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