i donnot know what to do with it do you know how to deal with 为什么后一句反而不加 it 前面know后面跟的不是宾语从句吗?从句中有了宾语前面还加what儿后面前面用的是副词反而不加it这是怎么回事

i donnot know what to do with it do you know how to deal with 为什么后一句反而不加 it 前面know后面跟的不是宾语从句吗?从句中有了宾语前面还加what儿后面前面用的是副词反而不加it这是怎么回事
i donnot know what to do with it do you know how to deal with
为什么后一句反而不加 it 前面know后面跟的不是宾语从句吗?从句中有了宾语前面还加what儿后面前面用的是副词反而不加it这是怎么回事

i donnot know what to do with it do you know how to deal with 为什么后一句反而不加 it 前面know后面跟的不是宾语从句吗?从句中有了宾语前面还加what儿后面前面用的是副词反而不加it这是怎么回事
前面一句从句的谓语动词是do,do后面没有宾语,with it 只是状语,从句还是缺少宾语的,所以用what.后面一句是承前省.因为前面有了with it结构,后面又用到with it结构,所以省略了it.

后面句子缺it.
do是及物动词，所以我们说 I can do nothing about /with it.因而就用what can you do with it.或what to do with it.(what 做do的宾语）
但deal 是不及物动词，必须借助with跟宾语，所以deal with sth,因此用how ,因为不缺宾语
疑问词+不定式起名词作用，所...

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后面句子缺it.
do是及物动词，所以我们说 I can do nothing about /with it.因而就用what can you do with it.或what to do with it.(what 做do的宾语）
但deal 是不及物动词，必须借助with跟宾语，所以deal with sth,因此用how ,因为不缺宾语
疑问词+不定式起名词作用，所以what to do with it 以及how to deal with it 做know 的宾语。
类似 i don't know when to leave.
i haven't decided how to start.
we are talking about how to deal with the matter.
i don't know what to say.

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to do with what，前面的it代表what，how to do，deal with相当于how to do中的do

前面提到过，后面就可以省略，从语法上说后面，整个句子还是不完整，但是从人们的说话习惯来说，这样是很符合西方人的习惯的。

后面不加IT是省略了，因为前面已经提到过IT
WHAT TO 作什么
HOW TO如何作
WHEN TO什么时候作。英语中有这种形式，可以作宾语