Why didn’t you select a nice subject?
你为什么不选一个好的主题呢？
Why you didn’t visit your teacher must be explained to me.
你必须跟我解释一下为何没去看望你的老师。
I wonder why he was late.
我不明白他为什么迟到。
That’s why I like playing football.
那就是我喜欢足球的理由。
This is probably the number one reason why this class is so popular.
这很可能是这门课如此受欢迎的首要原因。
Why not buy a book or some pencils?
为什么不买本书或一些铅笔呢？
— Let’s go to the movies.
我们去看电影吧。
— Why not?
好啊！
Why, look who’s here!
哎呀，看看这是谁！