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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 totouch the exhibits.

2) has /have been done 现在完成时

例All the preparations for thetask 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 builthere.

4) was/were done 一般过去时

例I was given ten minutes todecide 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 Iwas there.

7) shall/will be done 一般将来时

例Hundreds of jobs will be lostif the factory closes.

8) should/would be done 过去将来时

例The news would be sent to thesoldier'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 beencompleted before July.

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