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
