没有.
need由于既可以做情态动词又可以做谓语动词所以有这两种用法.
need do 是情态动词的用法,need to do是谓语动词的用法
need to be done = need doing
must只能做情态动词,表示必须或者是肯定的猜测
有没must to be done这种用法的?
1个回答
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