纠正一下一楼的, They all know what to do=They all know what they should do I tell them what to do=I tell them what they should do We don't know what to do= we don't know what we should/can do
what to do 本来就是宾语从句的一种类型 给一个具体的例子 这样没法改 比如They all know what to do. 他们都知道该做什么。=They all know what should they do. I tell them what to do.我告诉他们去做些什么。=I tell them what should they do
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