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必修5《Grammar》公开课PPT课件优质课下载
被动语态基本用法
当句子的主语是动作的执行者时，谓语的形式是主动语态。当句子的主语是动作的承受者时，谓语要用被动语态。被动语态由助动词be+过去分词构成，时态通过be表现出来。
说明：
（1）要将主动句里的宾语变为被动句中的主语，若主动句中的宾语为人称代词，要将宾格变成主格。
（2）把主动句中的主语变为被动句中的宾语，主格变宾格，并由by引导。
（3)谓语动词变成相应的被动形式。
主动句与被动句之间的转换
We bought some books.
主语 谓语动词主动语态的过去式 宾语 Some books were bought ( by us ) 主语 谓语动词被动语态的过去分词 介词+宾语
1、 一般现在时的被动语态. Our classroom is cleaned every day. This car is made in China.
2、一般过去式的被动语态 His desk was cleaned just now. The station was built in 1928.
3、现在进行时的被动语态 A new factory is being built in our city now. Some trees are being cut down in the park.
4、过去进行时的被动语态 A new factory was being built in our city at that time. Some babies were being looked after by Miss Chen last year.
5、一般将来时的被动语态: ? Some new factories will be built in our city this year.
6、过去将来时的被动语态 She said that some new factories would be built soon in our city.
7、现在完成时的被动语态 Some new factories have been built in the city since last year. Your watch has been mended already.
8、过去完成时的被动语态 He said that some new factories had been built in the city. I didn’t know that my watch had been mended .
一般
进行
完成
现在
主动语态
被动语态
过去
主动语态