Modals for obligation, advice and permission (must, mustn’t, have to, don’t have to, can, can’t, should, shouldn’t, may, may not) and for certainty (must, might, can’t).
Modals for obligation, advice and permission (must, mustn’t, have to, don’t have to, can, can’t, should, shouldn’t, may, may not) and for certainty (must, might, can’t).