英语必修五知识点(2)
英语必修五知识点：过去分词
过去分词兼有动词、副词和形容词的特征，可以带宾语或受状语修饰。过去分词和宾语或状语一起构成过去分词短语。它在句中可以作定语、表语、宾语补足语或状语。这节课讲解作定语、表语的用法。
1. 作定语
作定语的过去分词如果是单词，一般放在被修饰词的前面;过去分词短语作定语，一般放在被修饰词的后面。例如：
There are many fallen leaves on the ground.
This is a book written by a worker.
2. 作表语
过去分词作表语,多表示主语所处的状态。
I was pleased at the news.
The door remained locked.
过去分词作表语，相当于形容词，常见的有：delighted, disappointed, astonished, interested, satisfied, surprised, tired, worried, excited, married 等。
过去分词作表语时，应注意与被动结构的区别。系表结构说明主语的状态或具有的性质、特点;被动结构强调谓语动作。
The small village is surrounded by trees.(状态)
The small village was soon surrounded by enemy soldiers.(动作)
I'm interested in chess.(状态)
3. 过去分词做状语
①表时间，相当于一个时间状语从句，有时过去分词前可加连词 when 或 while 来强调时间概念。
Seen from the top of the hill, the city looked like a big garden.
Accepted by the Party, he decided to devote his life to the cause of the Party.
②表原因，相当于一个原因状语从句。
Exhausted, the children fell asleep at once.
Encouraged by the speech, the young people made up their minds to take up the struggle.
③表条件，相当于一个条件状语从句，有时过去分词前可用 if 等词
Heated, water changes into steam.
Given another chance, he will do better.
④表让步，相当于一个though/although引导的让步状语从句。
Laughed at by many people, he continued his study.
⑤表伴随，说明动作发生的背景或情况。
Surrounded by a group of pupils, the old teacher walked into the classroom.
The trainer appeared, followed by five little dogs.
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