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宾变主,主变宾,前加by
动变被,看清be, 结构分别be+ pp
主动语态
被动语态
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/ 宾语.
by them.
? Tom broke the window.??
??
The window was broken by Tom.
? Tom broke the windows.?
The windows were broken by Tom.
? He broke the windows.??
??
The windows were broken by him.
一般现在时： am / is / are done
一般过去时： was / were done
现在进行时： am / is / are being done
过去进行时： was / were being done
现在完成时： have / has been done
过去完成时： had been done