must, Internal obligations, External obligations, Past obligations, have to, External obligations, It’s not a good idea, It’s a good idea, an advice, had to, Past obligations, Lack of necessity, It’s not a good idea, don’t have to, Past obligations, Lack of necessity, Prohibition, mustn’t, Prohibition, Ability and permission, Lack of ability and prohibition, can, Ability and permission, Prohibition, Past ability, can’t, Lack of ability and prohibition, Lack of necessity, Internal obligations, could, Past ability, Lack of necessity, Ability and permission, should, It’s a good idea, an advice, Past ability, Ability and permission, shouldn’t, It’s not a good idea, Past ability, It’s a good idea, an advice.

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