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English
The light was invented by Thomas Edison .
light
invented
Thomas Edison
The Great Wall was built by Chinese people.
The Great wall built
The trees were planted by students.
trees planted
英语动词有两种语态：
主动语态 (the Active Voice)
被动语态(the Passive Voice)
What is it?
A. 主动语态表示主语是动作的执行者。
B. 被动语态表示主语是动作的承受者。
We planted the tree.
The tree was planted by us.
被动语态结构：
be + 过去分词(P.P) + (by …)
主变被解题步骤:
1. 找宾语 ----即动作的承受者
They make shoes in that factory.
Shoes
2. 判断宾语的单复数 ----即be动词的单复数.
are
were
3. 判断动词的时态 ----即be动词的时态.
4. 修改谓语的时态 ----即原句动词改为过去分词
made
5. 修改原句的主语 ----即by+ 主语.