什么叫做过去分词？？

过去分词:
1 构成: v +ed 或不规则的变化动词
2 过去分词本身的含义: 被动 或完成
现在分词本身的含义: 主动或进行
a broken heart 一颗破碎的心 a lost dog 丧家之犬
a risen sunvi 动词只有完成含义, 没有被动含义) 已升起 的太阳 a ploughed field 犁过的田地
3 单个的过去分词作定语时,常放 在所修饰的名词等于一个定从
Her job was to take care of the wounded soldier .
an organized trip a broken glass
4 过去分词短语作定语用时,常放 在所修饰的名词后
a trip organized by the League
a glass broken by the boy
5 过去分词作表语时, 放在系动词之后,表示 主语所处 的状态 ,被动语态则表示主语所承受的动作.
This lake is badly polluted . (系表结构)
This lake is badly polluted by a paper mill . ( 被动结构)
6 过去分词作宾语补足语
A过去分词与 宾语在逻辑上存在被动关系
I am glad to see the child well taken care of .
Could you please make yourself known to us ?
B vi动词的过去分词作宾补时,与宾语没有被动关系,只表示动作完成和状态
When I returned there , I found the bag gone .
When he woke up ,he found the world outside completely changed
C 常见接过去分词作宾补的动词有: make / want / leave / keep / watch / have / get / hear / find