why引导的什么从句

例句：

I don't get it ─ why would she do a thing like that?

我不明白——她怎么会干那种事？

If you love each other, why not get married?

要是你们彼此相爱，干吗不结婚呢？

Why not take a few days off?

为什么不休息几天呢？

Why oh why do people keep leaving the door open?

人们到底为什么总敞着门呢？

Why are you so dead set against the idea?

你为什么那样死命地反对这个主意呢？