I've never been to China and I don't know any Chinese.

我从没去过中国，也不懂中文。

youdao

I've had to close down my business now and I don't know what I'm going to do for money.

我现在不得不歇业，不知道要做什么来赚钱。

youdao

I don't know what the teacher is saying and I don't know how to do homework, either.

我不知道老师在说什么，我也不知道如何做家庭作业。

youdao

"One soldier had been fighting in the jungles for years. And I don't know if it had affected him or not, but when the clerk handed him a tweed suit to try on he spent three hours searching through the fuzz for snipers."

VOA: special.2009.03.09

And I don't know why, but since time immemorial that is the way computer scientists have drawn trees.

叶子是在最下面的，我不知道为什么,但从记事以来他们就是这么画树的,这也许就是为什么我们。

麻省理工公开课 - 计算机科学及编程导论课程节选

But the students, they think that I'm an old woman from the cave and I don't know anything

但学生们认为我是住在洞穴的老女人，我什么也不懂，

对于抄袭的想法 - SpeakingMax英语口语达人

Lakers use players in the playoffs who are named Who, What and I Don't Know.

CNN: 'L' is for losers in L.A. sports

We haven't seen any engineers and I don't know when it will get fixed.

BBC: BT blames bad weather for East of England repairs backlog

And I don't know all these guys, but I do know LeBron and Dwayne and Chris.

WHITEHOUSE: President Obama Welcomes the 2012 NBA Champion Miami Heat