vi. 发生(表偶然事件,无被动语态)
结构:sth happen (to sb/sth) (某人/某物)发生某事
如:What happened to you? 你发生什么事了?你怎么了?
A traffic accident happened here last night. 昨晚这里发生了一起交通事故。
vi. 碰巧
结构:
sb/sth happen to do sth 某人/某物碰巧......
It happen that从句 碰巧......
如:I happened to meet my friend yesterday.
= It happened that I met my friend yesterday.
我昨天碰巧碰到了我朋友。
3. 至于happen到底是哪个意思和用法,根据上述结构和句意即可猜知。