happen 用法
happen 是个常用词，也是历年高考经常考查的词语之一。下面笔者就其用法进行归纳总结，以备同学们学习时参考。
1. 一般指“发生意外的事或事故”。如：
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How did the accident happen yesterday? 昨天的事故是怎么发生的？
fullversion 2. 表示“某人发生（出了）某事；某物发生了某种情况”。即： sth. happens to sb. /sth. 如：
If anything happened to him, plea let me know. 万一他有什么不测，请通知我。
What has happened to your car? 你的车怎么了？
3. happen 在口语中可用进行时态，相当于 go on 。如：
A strange thing was happening (= was going on) in the village recently.
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最近村子里发生了一件奇怪的事。
4. happen 后面接不定式时，意为“碰巧、恰好”。如：
Someone in the office happened to notice her. 办公室里碰巧有人注意到她。
I happened to be out when he called. 他来访时我刚好出去了。
5. 当 happen 后面的不定式所表示的动作正在进行或已经完成时，须用不定式的进行式或完成式。如： He happened to be sleeping when his mother came into the room.
当他妈妈进屋时，他碰巧在睡觉。
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He happened to have known the cret, so I needn't tell him.
他碰巧已经知道了这个秘密，所以我不需要再告诉他。 immediately是什么意思
6. 句型“ It happens (happened) that …”中 it 是形式主语， that 引导的从句是句子真正的主语，此复合句可与简单句互换。如：
It happened that I had no money with me. = I happened to have no money with me.
我碰巧身上没带钱。
It happened that Tom was singing in the next room. = Tom happened to be singing in the next room. 汤姆碰巧在隔壁屋里唱歌。
It happened that my brother hadn't en the note. = my brother happened not to have en the note. 我弟弟碰巧没有看到那张条子。
7. 句型“ There happened to be …”表示“碰巧有……”。如：
There happened to be a heavy rain on my way home. 我回家的路上碰巧下大雨。
8. 习语“ as it happens (happened) ”表示“恰好，碰巧”。如：
As it happens, I have left the book at home. 我碰巧把书丢在家里了。
We met her only yesterday, as it happened. 我们只是在昨天才与她偶然相遇。
9. 习语“ whatever happens (happened) ”表示“不管发生什么情况”。如：
Whatever happened, I must be calm. 不管发生什么情况，我都要镇静。 lf introduction
We'll go along together whatever happens. 不管发生什么情况，我们都要一起干。
10. 可用在疑问句和条件句中，表示婉转的语气。如：
Do you happen to know his telephone number? 你知道他的电话号码吗？
If you happen to go there, would you ask him about it?
如果你有机会去那儿，可否问问他有关此事的情况？
11. happen 与 take place 的区别：
① take place 指按计划或安排发生的事，尤其指重大事件。如：
Great changes have taken place in my hometown in the last ten years. （不用 happen ）
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我的家乡在过去十年里发生了巨大的变化。
②指发生未预料到的小事情时可用 take place ，但一般不用进行时。
③ take place 表示“举行、进行”（ = be held ）。如：
When will the soccer game take place? （不用 happen ）足球比赛什么时候举行？
happen是不及物动词，它的用法常见的有如下几种情况：
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1. 表示“某地(某时)发生了什么事”，常用“sth.+ happen +地点/时间”这一结构来表达，此时主语应是事情。例如：
The story happened in 2003. 这个故事发生在2003年。
An accident happened in that street. 那条街上发生了一起事故。
2. 表示“某人出了某事(常指不好的事)”，要用“sth.+ happens to sb.”这一结构来表达。例如：
A car accident happened to her this morning. 今天上午她发生了交通事故。
What happened to you? 你怎么啦？
slice是什么意思3. 表示“某人碰巧做某事”，要用“sb.+ happen+ to do sth.”这一结构来表达。例如：
I happened to meet a friend of mine in the street yesterday. 昨天我碰巧在街上遇到了我的一个朋友。
4. happen表示“碰巧或恰巧发生某事”时，还可用“It happens / ”这一结构来表达。例如：
It happened that Brian and Peter were at home that day. 碰巧那天布莱恩和彼得在家了。
It happened that he had to take part in a meeting that afternoon. 碰巧那天下午他不得不参加一个会议。
注：that从句中的主语是人时，此种结构可以与“sb.+ happen + to do sth.”结构互换。例如：
It happened that Brian and Peter were at home that day. = Brian and Peter happened to be at home that day.
