我肯定你不知道我在说什么。

I'm sure you have no idea what I'm talking about.

youdao

你不知道我在说什么。

You won't know what I'm talking about.

youdao

我确信你不知道我在说什么，但别担心，有一天你会的。

You have no idea what I am talking about, I am sure. But don't worry, You will someday.

youdao

Please don't anybody tell me late - any time after today you didn't know when the mid-term was and therefore it clashes with 17 different things.

所以以后千万别跟我说,你不知道什么时候期中考试,然后还在考试那天安排大一堆事儿去做

耶鲁公开课 - 博弈论课程节选