"I didn't ask you to come. Incidentally, why have you come?"

“我没有叫你来。顺便问一下，你为什么来呢？”

《柯林斯英汉双解大词典》

Why have you marked this wrong?

你为什么批这道题为错？

《牛津词典》

Jack, why have you decided to take Chinese folk music as a course?

杰克，你为什么决定学中国民族音乐呢？

youdao

"That's why we need strong rules of the road to guard against the kind of systemic risks we have seen.

VOA: special.2009.09.18

And Moses said to the Lord, "Why have You dealt ill with Your servant , and why have I not enjoyed Your favor, that You have laid the burden of all this people upon me?

摩西对上帝说，您为何苦待你的仆人，为什么我得不到您的恩典呢？,您把所有人的重担都给了我一个人？

耶鲁公开课 - 旧约导论课程节选

Now, why have a story with a sperm as a narrator?

为什么要把精子作为叙述者呢？

耶鲁公开课 - 1945年后的美国小说课程节选

One has to ask the obvious question: why have European banks bought so many government bonds?

FORBES: Fanning The Financial Crisis: Has Regulation Gone Wrong?

Why have relative upstarts like Google, Apple and Amazon.com done so well even in this recession?

FORBES: Magazine Article

So why have stock prices gone up four times as fast as has wages?

FORBES: Stocks Edging Closer To Financial Cliff