I don't know what should I do?和I don't know what I should do?有什么不同?哪个正确?

问题描述:

I don't know what should I do?和I don't know what I should do?有什么不同?哪个正确?

I don't know what I should do.正确.
what引导宾语从句,从句要用陈述语序.