I know you did it—I just want to know why.

我知道这是你干的，我只是想知道为什么。

《牛津词典》

They don't know I know that, so it is a sort of secret.

他们都不知道我已经知道了，所以这算是一个秘密。

youdao

"O, I know, I know, so it is," replied the Rat evasively.

“噢，我知道，我知道，确实是这么回事。”河鼠推脱道。

youdao

But it's a lot easier than picking up trash, you know,and doing that, so,you know,I gave it a try."

VOA: special.2010.06.03

It's very simple. It's this: if I know what I'm doing, it is almost inevitably the case that you would know also.

实际上十分简单：,如果我知道我创作的是什么，那么你很可能也知道我创作的内涵。

普林斯顿公开课 - 人性课程节选

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

And I just wonder, what's your sense of how - you know, I know it's a difficult question.

NPR: The Missing Women Were Seemingly In Plain Sight

It'll take time, I know it, but in a while you're going to be mine, I know it.

NPR: '60s Icon Donovan Returns with 'Try for the Sun'

Mr. KENNEDY: Um, all I know is it was football, but I don't know if it was Monday night or Sunday night.

NPR: College Freshman Brings Unique Worldview to School