I don't know what to do中what to do是宾语从句吗?

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I don't know what to do中what to do是宾语从句吗?
如果what to do 是宾语从句,我怎么总感觉这个句子少成分呢?
如果what作主语,do后面少宾语,如果what作宾语,又少了主语
谁能帮我分析一下这个句子结构啊,
what在句子中到底作什么成分啊

二楼的回答不对.
I don’t know what to do里面的what to do明显不是从句,当然更不是什么宾语从句!
首先,一个从句,作为一个完整的句子,应该有主谓语.What to do里哪有谓语?
To do是吗?显然不是,谓语动词前面能加”to”?to do明显是动词不定式.而
what则是不定式to do的逻辑宾语.逻辑上的关系应该是“to do what”表示要做什么.“To do” 表示“做”后面接逻辑宾语“what”表示“什么”.所以整句话才能表示“我不知道要做什么”.请注意,我说的是 what 是to do 的“逻辑宾语”而不是“宾语”.差两个字之后意思差很多的.逻辑宾语是一种逻辑关系,而非语法关系.语法关系是 what做know 的宾语,而to do 做后置定语修饰 what.
类似地,也有"There is nothing to worry about”.没什么好担心的.其中 Nothing to worry about的逻辑和语法关系同what to do 是完全类似的.
当然动词不定式后置定语和被修饰成分的关系除了上面做阐述的“谓语接宾语”的关系外也可以有其他的逻辑关系,比如“主谓关系”.
你一定能理解以下的句子.
In my family,my mother is always the first one to get up.
在我家,我妈总是那个起床起的得最早的.
这个 the first one to get up的逻辑关系就是主谓关系.
The first 是主语.Get up是谓语.
而语法关系则是:to get up作为后置定语修饰the first one.

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