首先need既可作实意动词,又可做情态动词.
做实意动词时,否定为don't need to
做情态动词时,相当于can之类的,否定为need not do
do not need to do sth不必要做某事,强调动作,语气比don not have to do 弱一些.
need not do sth 则为must的否定形式,强调结果是不需要的.
didn`t need to do 和need not to do区别
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