what to do"做什么"问的是动作的对象,what是代词
how to do "怎样做"问的是动作的方式,how是副词
what to do中不需要加宾语,因为有了what作宾语
how to do 中how做to do的状语.还需要加宾语,句子才完整.例如：
I want to know for us what to do and how to do it.
如何讲解what to do结构和how to do 的区别
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