Ability, can / can't, could / couldn't, be able to, Prohibition, mustn't, to not be allowed to, Obligation, must (1), to have to, Non-obligation (lack of obligation/up to choosing), to not have to, to not need to, needn't, Permission, can/can't, could (1), may (not), be allowed to, Certainty, must (2), may, might, could (2), can't, Advice, should / shouldn't, ought(n't) to, had better (not)

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