1. why表疑问
Why are you sad?
你为什么悲伤？
Why were you late?
你为什么迟到？
Why did you go there?
你为什么去那儿？
Why do you like her?
你为什么喜欢她？
2. why表感叹
Why, what's happening?
啊，有什么事吗？
Why! I thought you were in London.
哎呀！我还以为你在伦敦呢！
Why, it's quite easy! A child could do it!
唔，那是相当容易的！小孩子也会！
Why, what did she say?
呃，她说什么？
3. why表建议
Why not go and have a look?
干嘛不去看看？
Why not try it once again?
为什么不再试试？
Why don't we go out to lunch today?
今天为什么不出去吃午饭呢？
Why don't we play soccer?
为什么不踢足球呢？
4. why表责备
Why didn't you wait for me?
你为什么不等我呢？
Why didn't you tell me?
你为什么不告诉我呢？
Why didn't you buy it?
你为什么不买下来呢？
Why didn't you study hard earlier?
你为什么不早点认真学习呢？