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happen
hap·pen / 5hApEn ; 5hApEn /verb I
1. when something happens, there is an event, especially one that is not planned〔尤指意外地〕发生;SYNoccur
When did the accident happen?事故什么时候发生的?
It's impossible to predict what will happen next.不可能预测接下来会发生什么。
something / nothing / anything happens
Something terrible has happened.可怕的事发生了。
She carried on as if nothing had happened.她接着干,似乎什么都未曾发生。
This was bound to happen sooner or later.这事注定早晚会发生。
This kind of thing happens all the time .这种事时常都会发生。
We'll still be friends, whatever happens .不管发生什么,我们仍然是朋友。
2. something / anything / what happens to sb / sth if something happens to someone or something, they are affected by an event某人/某事发生什么事情:
He should be here by now – something must have happened to him.他现在应该到了,一定是发生了什么事。
The same thing happened to me last year.去年同样的事在我身上发生。
What's happened to your coat? It's all ripped.你的外套怎么了?都扯破了。
3. happen to do sth if you happen to do something, you do it by chance碰巧(凑巧)做某事:
I happened to see James in town.我碰巧在镇上看见詹姆斯。
4. sb / sth happens to be sth used when telling someone something in an angry way某人/某物碰巧(凑巧)是…〔表示恼怒〕:
This happens to be my house!这正巧是我家!
5. as it happens / it just so happens used to tell someone something that is surprising, interesting, or useful碰巧,正巧〔用于告诉某人惊讶、有趣或有用的事〕:
As it happens, I know someone who might be able to help.我正好认识一个人,他也许能帮忙。
6. these things happen used to tell someone not to worry about a mistake they have made, an accident they have caused etc这种事情难免会发生:
It's not your fault – these things happen.这不是你的错,这是难免的。
7. whatever happened to sb / sth? used to ask where a person or thing is now某人/某物哪里去了?:
Whatever happened to Steve? I haven't seen him for years.史蒂夫哪里去了? 我已经好久没见他了。
accidents(will) happen at ACCIDENT(5)
 PHRASAL VERBS 
happen on / upon sb / sth
literary or old-fashionedto find something or meet someone by chance偶然碰上; 偶然看到:
I happened on the restaurant by chance.我偶然发现了这家餐馆。

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