how to do it和 what to do是什么来的?是不是宾语从句改为简单句?

问题描述:

how to do it和 what to do是什么来的?是不是宾语从句改为简单句?
这里的DO是泛指还是特指

是.例如I don't know how to do it.
=I dont't know how to do.
I wonder what I should do.
=I wonder what to do.