happen /ˈhæpən/ vi.1.发生：How did the accident happen?这事故怎么发生的? Whatever happens, we must keep calm. 不管发生什么情况，我们都应该保持镇定。happen to…(某人)发生 (某情况)，(某物)如何：If anything happens to you, let me know.如果你出什么事，请告知我。 2.碰巧，恰好（接不定式和用在It (so) happened that..的句型中） Someone in the office happened to notice her. 办公室碰巧有人注意到她。I happened to be out when he called. 他来访时我刚好出去了。It (so) happened that I had no money with me. (= I happened to have no money with me.) 我碰巧身上没带钱。
［辨析］与emerge, appear和occur辨见emerge
happening n.发生的情况
