Why do you have to be so untidy?

你为什么非得这么邋遢？

《牛津词典》

Why do you have to keep dragging up my divorce?

你为什么非要老提我离婚的事呢？

《牛津词典》

Why do you have to go to college to study art?

你为什么要上大学学习美术？

youdao

Usually when you know why it's not working, it's obvious what you have to do to make it work.

通常你明白了出错的原因后，很明显你必须让程序正常运行起来。

麻省理工公开课 - 计算机科学及编程导论课程节选

Why do you go to school?, "To have friends or to eat good food." you know.

你问他们“为什么要去上学？”他们回答往往是“交朋友或者吃好吃的”。

记忆深刻的研究 - 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

Why do you have to separate one out from the other?

WHITEHOUSE: Press Briefing

"People are wondering why do you have to pay more in order to get a weapon that is in the main game anyway, " said Keza MacDonald, games editor of the IGN news site.

BBC: Dead Space cheat undermines in-game micro-transactions

But what I think is that, you know, if you're going to, you know, pass a policy saying that gay boys can join the Boy Scouts, then why not, you know, actually go forward and, you know, why do you have to, you know, half throttle something when you can actually make a big change and send a message to the rest of America?

NPR: Price Too High For Being World's Top Military Force?