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② 一般过去时
A thief was caught last night.
They were asked to speak at the meeting.
③ 现在进行时
A new library is being put up in their school now.
The watch is being repaired.
④ 一般将来时
The class meeting will be held next Saturday afternoon.
The thieves will be arrested.
⑤ 现在完成时
My bag has been stolen.
Many stamps have been collected by me since last year.
3、主动语态变被动语态
① 主动结构的宾语变为被动结构的主语。
② 主动结构的谓语动词由主动语态变为被动语态。
③ 主动结构的主语变为介词by的宾语，组成介词短语，放在被动结构中谓语动词之后。在动作的执行者无须说明或不必强调时，by短语可以省略。
④ 主动语态、被动语态两种时态要保持一致。如：
We repaired the motor.
The motor was repaired by us.
【被动语态(二)】
几种不同形式的被动语态
(1)含有直接宾语和间接宾语的主动结构，变为被动结构时，可以将其中一个宾语变为主语，另一个不动，一般是主动结构的间接宾语变为被动结构的主语，这样句子显得自然一些。如：
He showed me his pictures.
I was shown his pictures by him.
I was sent a birthday present (by him).
A birthday present was sent to me (by him).
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