We use must/mustn't to express: A. obligation or duty, ...

★ Expressing Obligation and Modals

We use must/mustn’t to express:

A. obligation or duty, very strong advice, prohibition

B. prohibition

C. necessity

D. lack of necessity

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These are the examples of expressing obligation, except…

A. You shouldn’t do that

B. Really, must give up drinking coffee milk

C. We have to sleep before 10 p.m

D. She must wash her hands before eating