1) Person's responsibilities (something that a person needs to do at work, school etc) a) can b) must c) have to/ has to 2) Rules a) must and mustn't b) can and can't c) have to and don't have to 3) Ability (something a person knows how to do) a) must and mustn't b) have to and don't have to c) can and can't 4) When it's not important to do something. You don't need to do it. a) don't have to/ doesn't have to b) mustn't c) can't

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