must , deduction / logical certainty , can, permission, may, possibility, should, advice, have to , external obligation , must have , logical conclusion about the past , should have , regret about past action , needn’t have , unnecessary past action , could have , missed opportunity , can’t have , impossibility in the past , You must wear a helmet. , obligation , You should rest more. , advice , You can enter the room. , permission , You might be wrong. , possibility , You can’t park here. , prohibition .

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