英语：翻译“我听不懂你说的话”（指对方说的是自己不懂 的外语）

I can't understand what you say.

I can not understand what you say./I can not speak ***langauage.

Pardon ? / I can't follow you 。I don't understand what you said .

可以用：I don't understand the language you spoke.

我不懂你说的语言。

1 I am not sure
2 I am no idea.
3 I can't understand you.
4 pardon?
5 what is your meaning? I can not keep up