But I know what to do.

但我知道该怎样做。

youdao

I am very anxious, but I know what to do.

我很焦虑，但是我却无所适从。

youdao

Excuse me, but I want to know what all this has to do with us.

抱歉，不过我想知道这一切和我们有什么关系。

《柯林斯英汉双解大词典》

I do not know what else to do but make the best of a bad deal and shake hands over it."

VOA: special.2009.06.27

I know it's boring, but we need to do it so you know what the ground rules are.

我知道这很无聊，不过为了让你们了解规则,我们必须得做这个。

麻省理工公开课 - 计算机科学及编程导论课程节选

And yeah, I know you know how to do it, but let's think about what might happen if I wanted to do that.

对，我知道你们知道该怎么做，那么让我们看看如果我,想要完成的话会发生什么。

麻省理工公开课 - 计算机科学及编程导论课程节选

I'm sorry to of lied to you all but I didn't know what to do.

BBC: Tia Sharp murder trial: full Stuart Hazell letter

But I think we know what to do.

CNN: Clinton's October 9, 2007 speech on retirement security

"I know I've made mistakes and disappointed some people, but I want you to know that I've always tried to do what's best for Illinois, " she said in the ad.

CNN: Her high negatives make re-election a struggle