must的否定是否等于don't have to

问题描述:

must的否定是否等于don't have to

mustn't是“不能做某事”
don't have to是“不须做某事”=don't need to=needn't
不一样
mustn't自己的否定形式mustn't不表示不必这个概念,而是道德或法规上的不允许