I don't know. Correction—I do know, but I'm not going to tell you.

我不知道。不，我知道不假，但不打算告诉你。

《牛津词典》

I will willingly go away with you, but I do not know how to get down.

我很愿意和你一起走，但是我不知道怎么下去。

youdao

As you only have a short stay in Shanghai, you probably will not be able to do much more sightseeing. But if I can help in any other way, please let me know.

由于您在上海只能做短暂停留，您可能无法做太多的观光。但如果我能在任何其它方面帮上您的忙，敬请告知我。

youdao

Montclin did not move. "You know as well as I do that it is no use to tell Athnaise anything,"

VOA: special.2009.06.27

But if you say, well, I don't know how to do this, I am not going to bother, don't grade the paper.

但是如果你说，好吧，我不知道怎么做这个，我想麻烦，别给试卷评分。

麻省理工公开课 - 固态化学导论课程节选

Did I do something? Did I not, you know, please you?

我做了什么不对的吗？没有让你满意？

一定要给小费 - SpeakingMax英语口语达人

And, as always American thinks: Why do we do this when you know I am not a terrorist, and you know I know you know I am not a terrorist?

NPR: 'This American Moment' As Peggy Noonan Sees It

And one big thing is mentorship, so when you look around, I mean, honestly, even if you look at your family, you know, my sister understands what I do, but my brother, you know, not so much.

NPR: Women Breaking Firewall To U.S. Tech Capital

While I do not know the particulars of your situation, I can tell you that many teens in my practice voice dissatisfaction with certain aspects of their bodies so you are definitely not alone.

CNN: What can I do to grow taller?