I know what I know.

我知道的事我是知道的。

youdao

I know what I know after all these years.

这么多年来我只懂我知道的东西。

youdao

I know you are angry with me, but I don't know what you are angry about.

我知道你生我的气，但我不知道你因为什么而生气。

youdao

I do not know what else to do but make the best of a bad deal and shake hands over it."

VOA: special.2009.06.27

I began with their ideas of Japan and what did they know, because I knew that they knew very little.

我先让他们写了对日本的看法,和了解多少，因为我知道他们的知识很有限。

麻省理工公开课 - 媒体、教育、市场课程节选

I chose English Literature because when I started off a university, I didn't know what it was I wanted to do.

我选英语文学是因为当我刚上大学的时候，我不知道自己到底想做什么。

为何选那门专业？ - SpeakingMax英语口语达人

If I had not done this, I would never know what I did not know.

FORBES: To Continue Growing, Quit The Big Job

"I knew exactly what I was getting and I still know what I've got, " Pernetti said when he hired Rice.

CNN: Wrong move to fire bullying coach

But you know -- (laughter) -- you know that I say what I mean and I mean what I say. (Applause.) You know what I believe.

WHITEHOUSE: Remarks by the President in Dubuque, IA