I'm very upset and don;t know what ( )[do].为什么?

问题描述:

I'm very upset and don;t know what ( )[do].为什么?

I'm very upset and don't know what to do.不知道做什么才好
what to do其实正常语序是do what
don't know do what,但是what 肯定放前面啊,所以是what to do
跟how to do it区分。如何做。。

to do 我很难过不知如何是好.(不知道该做什么)