happen的过去式是happened。happen是英语单词，主要用作动词，意为发生;碰巧;偶然遇到。单词发音：英[ˈhæpən]美[ˈhæpən]第三人称单数：happens现在分词：happening过去式：happened过去分词：happened

　　双语例句

　　1、What happen between you and him?

　　你们之间发生什么事?

　　2、What will happen if you do nothing?

　　假如你什么都没做将会发生什么?

　　3、So I have to let it happen in some sense.

　　所以从某种意义上来讲，我得让它发生。

　　例句

　　1..All these changes happened over a period of time.

　　所有这些变化都是在一段时间内发生的。

　　2.You must on no condition tell them what happened.

　　你决不能告诉他们所发生的事。

　　3.This is the second time it's happened.

　　这已是第二次了。

　　4.You don't happen to know his name,do you?

　　你不会碰巧知道他的名字吧？

　　5.He gave me a guarantee that it would never happen again.

　　他向我保证这种事情绝不会再发生。

　　6.Who can say what will happen next year?

　　谁能说得出明年会发生什么事？

　　7.She gave us her version of what had happened that day.

　　她从她的角度向我们描述了那天发生的事情。

　　8.She gave us her version of what had happened that day.

　　她向我们描述了她认为那天发生的事情。

　　9.It's the best thing that has ever happened to me.

　　这是我所遇到的最好的事。