happen/ 'hæpən /

1.vi.[incident] [ accident+] 
(occur,result) 发生

What's happening?
发生什么事?
what will happen if...?
如果…会怎么样?
tell me what happened
告诉我发生了什么事
to happen to do sth
刚巧做某事
as it happens
碰巧
it's the best thing that ever happened to me
我从未遇上这么好的事情
֧ɨ