A:What's the matter? 怎么回事了?
B:Nothing's the matter. 没什么大不了的. A:What's wrong? 哪儿不对劲了?
B:It's nothing. Hardly worth mentioning. 没什么, 不值得一提的小事. What's going on here 这儿出了什么事?
How come? 怎么会呢?
Why bother? 何必多此一举? What for? 何必呢? 目的何在呢?
What on earth was that? 那到底是什么玩意儿?
