做定语的过去分词的逻辑主语就是被修饰的名词或代词（该被修饰成分承受过去分词表示的动作）。该过去分词通常表示其动作在谓语所表示的动作之前发生，或没有一定的时间性（此时强调被动意义）。
A letter posted today will probably reach him the day after tomorrow.今天发的信或许后天他能收到。（post在reach之前）
I hate to see letters written in pencil.我讨厌看铅笔写的信。（letter是被写的）
从语义上看，做定语的过去分词所起的作用相当于定语从句，有时定语从句和过去分词之间可以相互转化。
1.定语从句的谓语动词是一般现在时或一般过去时的被动语态时，可简化为过去分词。
This is the book which was written by Lu Xun.=This is the book written by Lu Xun.
2.当定语从句的谓语动词与先行词存在着动宾关系时。
What about the suggestions which Lily put forward?=What about the suggestions put forward by Lily?
注意：下列情况不能将定语从句简化为过去分词。
1.定语从句的谓语动词是连系动词be等时。
例：那些生病的人不要去看电影。
[误]Those been ill don't go to see the film.
[正]Those who are ill don't go to see the film.
2.定语从句的谓语动词是不及物动词时：因为不及物动词的过去分词不能做定语。
例：昨天死于车祸的男子是个抢劫犯。
[误]The man died in the accident yesterday was a robber.
[正]he man who died in the accident yesterday was a robber.
少数不及物动词的过去分词如fallen, boiled等可作前置定语：fallen leaves(落叶),boiled water(开过的水）。arrive, return等不及物动词的过去分词前有副词修饰时，可作后置定语：
The train just now arrived in Beijing is from Hong Kong.
注意比较过去分词、-ing形式、不等式做定语时的区别。
The building built last year is a hospital.
The building being built now will be a hospital.
The building to be built here next year will be a hospital.
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