Why? 为什么? How come? 为什么? What makes you think that? 你怎么会那么想呢? Tell me why. 告诉我为什么。 How did it happen? 是怎么发生的? What are you doing this for? 你干吗要去做这种事呢? Why did you do that? 你为什么干那样的事呢?
What causes it? 是什么原因呢? Explain it to me.请给我解释一下。 Why not? 为什么不行? What are you so happy about? 你怎么那么高兴? What for? 为了什么? For who? 为了谁? What's the purpose of your visit? 你旅行的目的是什么? No reason not to. 没有理由不让做吧。 Why are you here? 你怎么在这儿? I'll tell you why... 我告诉你为什么…… In brief, it's like this. 总之，是这么回事儿。 It started like this... 它的由来是这样的…… That's why! 原来如此! That's why... 所以……
