被动语态讲解
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's mother as soon as it arrived.
9） shall/will have been done 将来完成时（少用）
例The project will have been completed before July.
2. 被动语态的特殊结构形式
1)带情态动词的被动结构。其形式为：情态动词＋be＋过去分词。
例The baby should be taken good care of by the baby-sitter.
2) 有些动词可以有两个宾语，在用于被动结构时，可以把主动结构中的一
个宾语变为主语，另一宾语仍然保留在谓语后面。通常变为主语的是间接宾语。
例His mother gave him a present for his birthday.
可改为 He was given a present by his mother for his birthday.
3) 当“动词+宾语+宾语补足语”结构变为被动语态时，将宾语变为被动结构
中的主语，其余不动。
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