How do I know it was so expensive?

为什么我知道它这么贵？

youdao

How Do I Know It Works?

我怎么知道它有效？

youdao

How do I know it's a sign? How do I know it says' exit '?

我怎么知道这只是一个标志？，我怎么知道标志上写的是存在？

youdao

Let us say I want to sell my car but I do not know exactly how much it is worth.

VOA: special.2009.04.12

How do I know it's a sign? How do I know it says 'exit'?

我怎么知道这只是一个标志？，我怎么知道标志上写的是存在？

耶鲁公开课 - 文学理论导论课程节选

Now why--and here is the question why do we get this nervousness about the relationship between what I know and how I know it arising at this moment?

问题是,为什么那时候我们对,我知道什么和我如何知道的关系如此神经紧张？

耶鲁公开课 - 文学理论导论课程节选

Legend has it, I know how to do it.

BBC: In quotes: Italy's Silvio Berlusconi in his own words

The second complaint is usually: now that I know what I like, how do I make it work for my life?

FORBES: Art Collecting For Career Women: Savvy Tips on How To Start A Contemporary Art Collection

I'm also the creative head: I have to be free to make my decisions, and I have already proven that I know how to do it.

WSJ: Fashion Designer Jil Sander Makes a Comeback