I don't know. I really don't know.

我不知道我真的不知道我…

youdao

I really don't know, but I still want to know.

我真的不知道，但我还是想知道。

youdao

"I don't know what I would do if I was her. I really don't know," she says.

“我不知道如果换做我的话，我会怎么做，我真的不知道，”她说。

youdao

So I think this is a chance for them to know more about China, what China is really like.

VOA: special.2010.02.04

I can't go down to the registrar and say, you know, I'd really like to do it at another time.

我不能去和登记的人说，我想要换个时间。

麻省理工公开课 - 固态化学导论课程节选

When a student says, you know, "Thanks for that lesson, I really enjoyed it," or you know, or something like that,

当一个学生说，“感谢那门课，我真的很喜欢它，”或者其他类似的话，

在公园相遇的老师 - SpeakingMax英语口语达人

And I feel like I really know her.

CNN: Food allergy diagnosis 'an inexact science'

On the other hand, I use Facebook very sparingly and I only friend those people who I really know.

FORBES: The Only Privacy Policy That Matters is Yours

Ms. DANA PERINO (White House Press Secretary): And so I got asked about the Cuban missile crisis, and I was panicked a bit because I really know about -nothing about the Cuban missile crisis.

NPR: Ron Paul Brings the Youth Vote