今天我不知道是怎么回事，累死了。

I don't know what's wrong today. I'm absolutely dead.

youdao

你不知道的是，我今天给你做了一个小小的态度测试。

You didn't know it, but I gave you a little attitude test today.

youdao

今天是我的生日。你好像不知道似的！

It's my birthday. As if you didn't know!

《牛津词典》

And Steve Furlanetto--I don't know if Steve is here or not.

还有史蒂夫·弗拉内多,我不知道他今天在不在

耶鲁公开课 - 基础物理课程节选

I don't know if it's possible to finish this by the end of today.

我不知道我们能不能在今天之内把这件事做完。

I don't know 课堂 - SpeakingMax英语口语达人