在美国当代英语语料库统计的20000个常用词中，happen位居常用词第216位，在4.5亿个单词中出现了182714次。今天就带大家一起来系统学习happen的用法。

词形变化：

happens,happened,happened

Happen词义解析：

1.(of a situation or an event) to have existence or come into existence  发生

No one knows exactly what happened .

没人确切了解发生了什么事。

Anything could happen in the next day.

接下来的一天内什么事都可能会发生。

A funny thing happened in the office today.

今天，办公室里发生了一件有趣的事。

2.  If something happens to someone or something, it has an effect on him, her, or it.发生在（某人）身上；作用于…

I don't know what I'd do if anything happened to him (= if he was hurt, became ill, or died).

我不知道一旦他出了事我该怎么办。

What happened to your shirt? There's a big rip in the sleeve.

你的衬衫怎么了？袖子上撕了一条大口子。

3.  to do or be by chance 偶然，碰巧

They happened to look (= looked by chance) in the right place almost immediately.

他们碰巧几乎一下就找对了地方。

Fortunately it happened (that) there was no one in the house at the time of the explosion.

幸运的是，爆炸发生时，屋子里没有人。

It just so happens that I have her phone number right here.

非常凑巧，我正好有她的电话号码。

She happens to like owl (= she likes owl, although that is surprising).

她恰恰喜欢猫头鹰。

4. perhaps可能；我估计

Happen it'll rain later on.

过一会儿可能会下雨。

词组搭配：

on/upon sth/sb

to find or meet something or someone by chance 偶然发现；偶然遇到

Eventually they happened on a road leading across the desert.

最后，他们偶然找到了一条穿越沙漠的路。

along/by (somewhere)

to go to a place by chance or without planning to 碰巧来到

I'd have drowned if he hadn't happened along and pulled me out of the river.

要不是他碰巧走过，把我从河里拉上来，我可能已经淹死了。

to sb

发生在（某人）身上；作用于…

What happened to you? You look so sad.

发生什么事了？你看起来好难过。