基本信息
08年高三英语期末考试语法复习之被动语态
一、被动语态的构成形式
1. 被动语态的基本时态变化
被动语态通常为10种时态的被动形式, 被动语态由be＋过去分词构成，be随时态的变化而变化。以do为e.g. ，各种时态的被动语态形式为：
1) am/is/are +done 一般现在时
e.g. Visitors are requested not to touch the exhibits.
2） am/is /are being done 现在进行时
e.g. A new cinema is being built here．
3） was/were done 一般过去时
e.g. I was given ten minutes to decide whether I should reject the offer.
4） was/were being done 过去进行时
e.g. A meeting was being held when I was there.
