what could i say与What can I say有什么区别?

what could i say与What can I say有什么区别?
what could i say与What can I say有什么区别?

what could i say与What can I say有什么区别?
基本没区别.

前者更谦虚些

一个是时态区别，还有一个could可表示虚拟语气