How did he know she was a-witching him?

他怎么知道她要迷惑他呢？

youdao

But who... how did he know... where to bring you?

但是，他是谁……他怎么知道……从哪里把你带回来的？

youdao

Her grief was still raw and he did not know how to help her.

她的悲伤仍然强烈直露，他不知道如何帮助她好。

《柯林斯英汉双解大词典》

He did not know where he was or how he got there.

VOA: special.2009.02.02

Well, he also did architecture like me, so that's how we know each other.

嗯，他也像我一样搞建筑，我们就是那样认识彼此的。

我喜欢的建筑物 - SpeakingMax英语口语达人

Millicent complained that he did not know how to enjoy life.

VOA: special.2009.01.31

How did he know about the franchising business and corporate culture?

FORBES: While Americans Indulge In Over-Consumption, Chinese Move Up By Enduring Hardship

How did he know which way to go?

CNN: One block, two tornadoes: Life in the crosshairs

How did he know when to sell?

BBC: The Truth about Property