Sorry!I can't get what you said.
因为话已经说过了...所以说应该用过去时
Sorry! I can't understand what you are saying
Pardon?
I don't understand waht are you talking about
Excuse me
三个都行
Sorry! I don't know what you mean.
Sorry! I can't catch you.
Sorry! I don't understand.
Sorry!I don't understand what you are saying.
应该用从句。。。
Sorry,I don't know what you're talking about.