你何不给客人调制鸡尾酒？

Why don't you mix our guests a cocktail?

《牛津词典》

我们希望防止任何不愉快的事发生。

We hope to prevent anything unpleasant from happening.

《牛津词典》

你何不在某个时间来看看我？

Why don't you come and see me sometime.

《柯林斯英汉双解大词典》

Why can't you take to the Hustings, persuade your fellow citizens that taxation is unjust and try to get a majority?

你何不去参加竞选，劝说你的同胞,收税不公正的，并争取到大多数人的支持呢？

耶鲁公开课 - 公正课程节选

So why don't you talk about the experience that you had in Israel and also a little bit about what it means to be an Orthodox Jew for those people who don't know maybe the difference between reform and conservative Orthodox.

那何不讲讲你,在以色列的经历,再讲讲,什么是犹太教正统派,向那些可能不知道,改革以及保守正统派的区别的人解释一下。

普林斯顿公开课 - 人性课程节选

And while we're at it, why don't we have overhauling of your interests and desires, your tastes?

既然说到这里，何不彻底必变一下你的兴趣,渴望和品味？

耶鲁公开课 - 死亡课程节选