Ability: can/ can't, could/ couldn't have+ V3, could/couldn't, will/won't be able to/was able to, Permission: may/could, can, was/were allowed to, Advice: should/ shouldn't, ought to/ oughtn't to, had better, may/ might as well (no better option), Criticism: should/shouldn't have+ V3, ought to/ oughtn't to have+ V3, could/ might have+ V3 (annoyance), Obligation and necessity: must/ mustn't, have to/ don't have to, need to/ needn't/ don't need to, had to, didn't have/need to, needn't have+ V3, will/ won't need to, will/won't have to, Degrees of certainty: must+ be, can't+ be, couldn't +be, must have+ V3, can't have+ V3, Couldn't have + V3, ought to/ should, ought to/ should have + V3, could/may/might, could/ may/might have been,

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