must,need,can,may的否定式?

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must,need,can,may的否定式?must,need,can,may的否定式?must,need,can,may的否定式?need——needn''t:don''thavetomust——nee

must,need,can,may的否定式?
must,need,can,may的否定式?

must,need,can,may的否定式?
need——needn't:don't have to must——needn't can——can't may——mustn't

mustn't, needn't; can't, may not