我想知道为什么他做出了那么夸张的假样子。

I wondered why he had gone through the elaborate charade.

《柯林斯英汉双解大词典》

我想知道为什么警察永远不会犯错？

Why, I should like to know, are the police never to be wrong?

youdao

孩子们想知道为什么要催他们快走。

The boys wanted to know what the hurry was about.

youdao

They're very interesting to me and I wonder why the business community isn't more aware of them.

它们非常有趣 我也想知道,为什么工商界对它们没有足够的重视

耶鲁公开课 - 金融市场课程节选

Why do we want to know the answer to that question?

为什么我们想知道这个问题的答案？

麻省理工公开课 - 固态化学导论课程节选

One wants to know why, why does he want to do that?

人们想知道为什么他想这么做？

耶鲁公开课 - 政治哲学导论课程节选