happen的过去式是happened。
过去式：happened。
happen，主要用作动词，意为发生；碰巧；偶然遇到。
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。
happen有出现发生的意思，那么你知道happen的过去式是什么吗?下面是我为你整理的happen的过去式的相关资料，希望对你有所帮助!
happen的过去式过去式： happened
vi.发生碰巧出现偶然遇到
happened的造句1. Mechanization happened years ago on the farms of Islay.
数年前，艾莱的农场就实现了机械化。
2. It happened at Stamford Bridge one murky November afternoon.
这发生在11月一个阴沉的下午，斯坦福德桥上。
3. Her son used sign language to tell her what happened.
她儿子用手语告诉她发生了什么事。
4. Elaborate efforts were made to reconstruct what had happened.
为重现当时的情景，他们做了大量细致的工作。
5. An investigation is underway to find out how the disaster happened.
调查已经展开，以查明灾难是如何发生的。
6. He gave a detailed account of what happened on the fateful night.
他详细描述了那个灾难性夜晚所发生的事。
7. "What's happened to her?" — "I'm sure she won't be long."
“她怎么回事?”——“我相信她快到了。”
8. I remember now. He arrived just at the moment it happened.
现在我想起来了，他恰恰在事情发生的时候到了。
9. We happened to discover we had a friend in common.
我们凑巧发现我们有一个共同的朋友。
10. The accident happened on a notorious black spot on the A43.
事故发生在A43号公路上一个出了名的事故多发地段。
happen的常见例句1. Remember, keep a positive attitude and good things will happen.
记住：保持乐观的心态，好事自然会发生。
2. Do not wait for good things to happen to you. You need to walk towards happiness.
不要等待好事降临，你要向幸福进发。
3. This is such an unforeseeable situation that anything could happen.
这种情况很难预测，什么事都有可能发生。
4. I go all tingly when I think of what might happen.
我一想到可能发生的事就满心欢喜。
5. He couldn't help worrying obsessively about what would happen.
他禁不住时刻担心将会发生的事情。
6. When events happen that shake these beliefs, our fear takes control.
当一些事情的发生动摇这些信念时，恐惧就会占据我们的心灵。
7. Lucy shut her eyes so she wouldn't see it happen.
露西闭上了眼睛，这样就不会看到它发生了。
8. Deep inside the awareness was stirring that something was about to happen.
内心深处隐隐感觉到有什么事即将发生。
9. She wondered what would happen if her parents found her.
她不知道如果父母找到自己会有什么结果。
10. To start with, where and when did it happen?
首先，这事发生在何时何地?
happen过去式happened。它是不及物动词，没有被动语态。如：The story happened in 1601.
What happened then？这句话不能说What was happened then？
在这里What 做主语，这是一个主谓结构。
1.发生
The accident happened outside my house.
这个事故发生在我家房子的外面。
2.（与to连用）碰巧,巧遇
I happened to be in the market yesterday when a fire started.
昨天发生火灾时，我正好在市场上。
I happened to see Peter on the way to the bookstore yesterday.
昨天我去书店的路上碰巧遇见了彼得。
3.（与on, upon连用）偶然发现
I happened on an old country hotel during the last summer holidays.
去年暑假期间我偶然发现了一家古老的乡村旅馆。
4.happen to．．．临到某人头上
Did you hear what happened to David last night?
你听说大卫昨天晚上发生什么事了吗?
