what to do with it 、 how to deal with it 、how to do with it的用法以及解释，还有什么时候他们相等

Question

what to do with it 、 how to deal with it 、how to do with it的用法以及解释，还有什么时候他们相等还有是否有what to deal with it

Answer 1

what to do with it:该怎么处理；how to deal with it:该如何解决；how to do woth it:如何处理。没听说过 what to deal with it 的用法。
如果某人给你一张纸，你问 what to do with it?就是问可以干嘛呢？ 写字 画画 折纸等的回答。 而 how to do with it?是你知道对方给你是干嘛的，但是如何写 如何画 如何折 才是回答。
how to deal with it,一般用在解决问题上面。比如 桌子上多了一张纸 你问 how to deal with it. 该如何处理？丢掉 拿来用 才是这个回答

Answer 2

I don't know what to do with it.=I don't know how to deal with it.
这两个是一个意思。 what 是do的宾语；how 是副词修饰deal.

Answer 3

how to do 是怎么干，有明确目的
what to do 是干什么，无明确目的