问一下你为什么要离开不知是否唐突？

Would it be impertinent to ask why you're leaving?

《牛津词典》

我可否问一下你为什么要作出那样的决定？

May I ask why you took that decision?

《牛津词典》

她看着妈妈，好奇地问：“妈妈，为什么你的头发有些是灰色的？”

She looked at her mother and curiously asked, "Why are some of your hairs grey, Mom?"

youdao

Lane looked faintly interrupted. "Why what?" " Why did you think it was going to go over like a lead balloon?"

莱恩微弱的问，什么为什么“,为什么你认为它像一个领头气球“

耶鲁公开课 - 1945年后的美国小说课程节选

And if you talk to most Americans and you're like, "Oh, why should I put this article there?"

如果你这样问大多数美国人，“为什么要把这个冠词放在这儿？”

韩国人经常犯的失误 - SpeakingMax英语口语达人

Why 5,040, you may ask;do we have any mathematicians among us who will give me a quick answer to that?

你会问为什么是五千零四十个呢,在座的有没有数学家能快速给出答案

耶鲁公开课 - 古希腊历史简介课程节选