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i don't know to do what 这句话到底错在哪里?

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i don't know to do what 这句话到底错在哪里?

我知道正确的说法是 i don't know what to do
但 i don't know to do what 这个我觉得也对呀,to do what这个不定式作宾语,不可以吗?
这个句子类似于 i don't want to go to school
to go to school就是不定式作want的宾语
为什么 to do what作know的宾语就不对呢
求语法好的详细解答
i don't know to do what 这句话到底错在哪里?
1,I don't want to go to school里边儿,to go to school 是要want 的宾语,属于动词不定式做宾语这个语法现象.
2,I don't know what to do就是另外一个语法现象啦.what to do是一句话了,相当于是what I should do一类,视为一个完整的句子.那这个语法现象就是v(动词)+宾语从句了.在宾语从句中,疑问词前置.i don't know where to go,I don't know who to believe...这类的吧,也可以补全为 :i don't know where I should go to ,I don't know who i can believe,