to do是英语中的“不定式”,固定搭配.一般的及物动词后面可以直接接名词,比如tell sb这种讲法.类似的还有很多,比如ask sb to do sth,很多及物动词都是搭配不定式.
当然,要特别注意的是情态动词,像Must、shall、can之类的词后面就不能接to do,只能接do啦~.
tell sb to do sth 为什么要加to
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