0 (of a situation or an event) to have existence or come into existence -- 發生
No one knows exactly what happened but several people have been hurt. 沒人確實了解發生了甚麽事，只知道有數人受傷。
Anything could happen in the next half hour. 接下來的半小時內甚麽事都可能會發生。
A funny thing happened in the office today. 今天，辦公室裡發生了一件有趣的事。
I don't want to think about what might have happened if he'd been driving any faster. 我不願意去想假如他再開快一點的話會怎麽樣。
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該怎麽辦。
What happened to your jacket? There's a big rip in the sleeve. 你的夾克怎麽了？袖子上裂了一條大痕。
What's happened to my pen? (= Where is it?) I put it down there a few moments ago. 我的鋼筆哪裡去了？我剛剛把它放在那裡。
1 to do or be by chance -- 偶然，碰巧
[ + to infinitive ] They happened to look (= looked by chance) in the right place almost immediately. 他們碰巧幾乎一下就找對了地方。
[ + (that) ] Fortunately it happened (that) there was no one in the house at the time of the explosion. 幸運的是，爆炸發生時，屋子裡沒有人。
[ + that ] It just so happens that I have her phone number right here. 非常湊巧，我正好有她的電話號碼。
She happens to like cleaning (= she likes cleaning, although that is surprising). 她剛好就喜歡打掃清潔。
I happen to think he's right (= I do think so, although you do not). 我真的認爲他是對的。
As it happened (= although it was not planned), I had a few minutes to spare. 我碰巧有幾分鐘空閒。
2 perhaps -- 有可能，據估計
It is frightening to think what might happen if she left him.
I could tell from her expression that something serious had happened.
The police showed him a photo to try to jog his memory about what had happened on the night of the robbery.
"Do you remember much about the accident?" "No, it all happened so suddenly."
On Sundays I just wear any old thing that I happen to find lying around.
Did she happen to mention whether she would be coming?
I just happened to be walking past when he came out of the shop.
