ability: can (matches one of two categories), could (belongs to one of two categories), be able to, possibility: may, might, can (belongs to one of two categories), could (matches one of two categories), willingness, refusal to do something: will / would, necessity, deduction: must, have to, have got to, "not necessary" (in the past): didn't need to, didn't have to, needn't have, suggestion, recommendation, "good idea", responsibility: should, ought to, impossible: can't, couldn't, habitual events: would  , used to,

Modals

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