前置相当于形容词。 后置相当于定语从句。
前置定语：
单个的过去分词作定语,通常放在被修饰的名词之前,相当于形容词，表示被动和完成意义。
（图片来自网络侵删）
后置定语：
过去分词短语作定语时,通常放在被修饰的名词之后,它的作用相当于一个定语从句。
相关介绍前置定语：
A类:被动意义:
an honored guest 一位受尊敬的客人。
The injured workers are now being taken good care of in the hospital.
受伤的工人现正在医院受到良好的照料。
B类:完成意义:
a retired teacher 一位退休的教师。
They are cleaning the fallen leaves in the yard.
他们正在打扫院子里的落叶。
后置定语：
his will be the best novel of its kind ever written (=that has ever been written).
这将是这类小说中写得最好的。
Who were the so-called guests invited (=who had been invited) to your party last night?
昨晚被邀请参加你的晚会的那些所谓的客人是谁呀？
