take place, happen, occur, come about和break out用法区别 
这些词或短语都有“发生”的意思，但用法各不相同，区别如下：
(1). take place 表示“发生、举行、举办”，一般指非偶然性事件的“发生”，即这种事件的发生一定有某种原因或事先的安排，例如：
Great changes have taken place in our hometown during the past ten years.
The Olympic Games of 2008 will take place in Beijing.
(2) .happen作“发生、碰巧”解，一般用于偶然或突发性事件，例如：
What happened to you?  (一般不说：What did you happen?)
Maybe something unexpected happened.
I happened to see him on my way home.
= It happened that I saw him on my way home.
(3). occur作“发生、想到、突然想起”解，其意义相当于happen，例如：
What has occurred? (=What has happened?)
A big earthquake occurred (=happened) in the south of China last month.
It occurred to me that she didn’t know I had moved into the new house.
(4). come about表示“发生、产生”，多指事情已经发生了，但还不知道为什么，常用于疑问句和否定句，例如：
When Mother woke up, she didn’t know what had come about.
I’ll never understand how it came about that you were late three times a week.
Do you know how the air accident came about?
(5). break out意思为“发生、爆发”，常指战争、灾难、疾病或者争吵等事件的发生，也可以表示突然大声叫喊等，例如：
Two world wars broke out last century.
A fire broke out in the hospital in the mid-night.
After the flood, diseases broke out here and there.
occur toShe broke out, “That is too unfair!”
occur vi.    1发生 2 想起，想到
常用搭配：sth. occurs to sb.:某人突然想起某事；
          It never occurred to sb. that…:某人从未想到……
More people are afraid to take planes because several air crashes have occurred this month.
Suddenly a good idea occurred to her.
It never occurred to us that the well-dressed man was a pickpocket.
我们决没有想到，那个衣冠楚楚的人是个扒手。
happen vi 1发生（多指偶然发生） 2碰巧，恰巧（不可用被动）]
常用搭配：happen to sb.:某人会怎样
        happen to be…; happen to do…;
        it (so) happened that…
eg The accident happened during a stormy night.
What will happen to them if they lose their way in the forest?
He happened to be out shopping when the fire broke out.= It (so) happened that he was out shopping when the fire broke out.火灾发生时，他碰巧外出购物。
happen常指一件事出乎意料地发生了，强调偶然性，happen还有碰巧;
在以具体事物、事件为主语时happen和occur往往可以通用。
如，The explosion occurred / happened 5 minutes ago.
如果所发生的事不具体，happen比occur要好。如，I don't know what happened after I left. 
take place 1发生 2 举行（侧重事先计划好或安排好的事情，不能用被动）
eg Do you know when and where the story took place?
The Olympic Games take place every for years.
In 1919，the May 4 th Movement took place in China.
occur 还有"被想到"，take place还有"举行"之意。此时它们不可以互换。
These plants only occur in Africa的意思为"这些植物只是在非洲才有。"此句中occur 意思为"存在"。
Happen的三种用法与三点注意
一、happen是不及物动词。happen在初中英语教材中的用法主要有以下三种：
1. "sth.+happen+地点/时间"，意为"某地/某时发生了某事"。例如：An accident happened in that street.那条街发生了一起事故。
  What's happening outside?外面发生什么事了？
  2. "sth.+happen to+sb."意为"某人出了某事(常指不好的事发生在某人身上)"。例如：
  A car accident happened to him yesterday.昨天他发生了交通事故。
  What happened to you?(=What was wrong / the matter with you?)你怎么啦？
  3. "sb.+happen+to do sth."意为"某人碰巧做某事"。例如：
  I happened to meet her in the street.我碰巧在街上遇见她。
  It happened that I was out when he called.他来访时我碰巧不在。
  二、同学们在使用happen时，以下三点情况值得注意：
  1. happen为不及物动词，不能用于被动语态。例如，要表示"这个故事发生在去年。"不能
说：The story was happened last year.但可以说：The story happened last year.
  2. happen为短暂性动词，不能与表示一段时间的状语连用。例如，要表示"这事发生一年了。"不能说：This happened for one year.但可以说：This happened one year ago.
  3. happen一般用来强调某事发生的偶然性。如要表示事先安排或有准备的事情或活动，则不能用happen，而要用take place。例如：
  A sports meeting took place(=was held) in our school last week.上周我校举行了运动会。(不能说：A sports meeting happened in our school last week.)

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