为什么不能用accidents be caused by.只能用accidents caused by.

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为什么不能用accidents be caused by.只能用accidents caused by.
为什么不能用accidents be caused by.只能用accidents caused by.

为什么不能用accidents be caused by.只能用accidents caused by.
被动啊,
accidents caused by和accidents are caused by都有
但是有区别
accidents are caused by+sth.,比如by the unawareness of drivers
但是
accidents caused by sth.+句子
e.g.
accidents caused by careless drivers are very serious

因为
过去分词作后置定语，现在分词，介词短语做后置定语，都是有定语从句变化而来。
定语从句省略掉关系代词+be 动词得到的，必须一起省略。缺一不可，
accidents( that/which are )caused by```
所以第一种显然是错误的。
再给你几个例子：
people (who/that are) on the s...

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用过去分词做定语时，表示已经被做，不需要加be。如：a house built last year，去年建的一所房子。
如果是正在被做，用being加过去分词，如：a bridge being built，一座正在施工的桥梁。
如果是将要被做，要用to be 加过去分词，如：a school to be built next year，一所明年要建设的学校。...

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