1. happen v.发生 happening n.事件;偶然发生的事情
归纳: happen to do…碰巧
happen to sb.（某人）发生什么事了
it happened that…碰巧
If anything happens to him, please let me know. 万一他有什么不测,请告诉我.
It happened that I had no money on/about/with me. 碰巧我身上没带钱.
=I happened to have no money on/about/with me.
辨析：happen, occur, take place, come about
happen一般用语，强调事情发生的偶然性
occur较正式,既可以指自然发生，也可以指有意安排
take place指有计划,事先安排的进行的含义
come about注重事情发生的原因，常与how连用
考点例题：
1）When did the accident _____________________?
2）It _____________________ to me that he might agree with the idea.
3）The concert will _______________________ next Sunday.
4）How did the quarrel ________________________?
5）改错：China has happened /taken place great changes since 1978.
