被动语态是什么??

一、被动语态的构成形式

1. 被动语态的基本时态变化

被动语态通常为十种时态的被动形式, 被动语态由be＋过去分词构成，be随时态的变化而变化。以do为例，各种时态的被动语态形式为：

1) am/is/are +done (过去分词) 一般现在时

例Visitors are requested not to touch the exhibits. 2） has /have been done 现在完成时

例All the preparations for the task have been completed, and we're ready to start.

3） am/is /are being done 现在进行时

例A new cinema is being built here．

4） was/were done 一般过去时

例I was given ten minutes to decide whether I should reject the offer.

5） had been done 过去完成时

例 By the end of last year, another new gymnasium had been completed in Beijing.

6） was/were being done 过去进行时

例A meeting was being held when I was there.

7） shall/will be done 一般将来时

例Hundreds of jobs will be lost if the factory closes.

8） should/would be done 过去将来时

例The news would be sent to the soldier