Why don't you mix a cocktail for our guests?

你给客人调制鸡尾酒好吗？

《牛津词典》

Why should I beggar myself for you?

我为什么要为你受穷？

《牛津词典》

For goodness' sake, why didn't you call me?

天哪，你为什么没给我打电话？

《柯林斯英汉双解大词典》

"Why would you want a plastic that you use for a year to last for two hundred years?

VOA: special.2010.06.01

But these days you pay for it which is why you get SSDs, you're paying several hundred dollars more.

但是现在你购买固态硬盘，需要多花费几百美元。

哈佛公开课 - 计算机科学课程节选

I mean, you've been banging on that pen for a long time and I don't understand why.

我是说，你一直用那支笔敲来敲去，我不明白为什么。

Would you please 实战 - SpeakingMax英语口语达人

If you were opposed to this legislation, you should obviously explain why, and you should explain why you are for something that 90 -- you are against something that 90 percent of the people are for, that vast majorities of the people in your state support.

WHITEHOUSE: Press Briefing

While you may know why you asked for something, your employees might need a little reminder.

FORBES: Connect

If you cannot give three really good reasons why you are perfect for the job, why should a potential employer take the time to do it?

FORBES: Six Reasons You May Still Be Unemployed