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v-ed分词常被叫做被动分词，而为什么有的v-ed分词并无被动含义，例如fallen leaves?
凡是由不及物动词变来的 v-ed 分词,都没有被动含义,而只有“完成”含义,这是它跟 v-ing 的不同之处,如 return→returned(father), grow→grown(boy), escape→escaped(prisoner), fall→fallen(leaves):
The fallen player was helped to his feet. (FWF) 那位跌倒的运动员有人帮他站了起来。
A grown man like you shouldn't act like that. (LDCE) 像你这样的成年人不应该有那种举动。
the country concerned/involved
单个的过去分词(v-ed)既可以做前置定语,也可以做后置定语。请问这两种用法有什么区别。
单个的过去分词用作定语时大都前置，如: an abandoned hope, the wanted man, the broken window。有时也可以后置。后置的目的，主要是为了突出其动词性或暂时性：
The material needed is zinc. 需要的材料是锌。
The method adopted was effective. 所采用的方法是有效的。
Things seen are mightier than things heard. 看到的事比听到的事更有力的。
The people involved were not found. 涉及到的人还没找到。
其次，有些过去分词后置已成固定用法：
the amount demanded(所需的数量)
the earliest inventions known(已知的最早的发明)
另外,有些过去分词做后置定语与做前置定语是有不同的含义:
the countries concerned(有关的国家)
a concerned expression(忧虑的表情)
the parties involved(有关各方)
an involved problem(复杂的问题)
jobs wanted(寻找的工作)
wanted men(被通缉的人)
He talked to me like a concerned older brother. 他跟我谈话,像个关切的老大哥。
She told me an involved story about her family. 她给我讲了有关她家庭的复杂关系。