一、 被动语态的用法：
1. 一般现在时的被动语态构成：is / am / are + 及物动词的过去分词
Our classroom is cleaned every day.
我们教室每天都被打扫。
2. 一般过去时的被动语态构成：was / were + 及物动词的过去分词
A new shop was built last year.
去年修了一座新商店。
3. 一般将来时的被动语态构成：will+ be + 及物动词的过去分词
A new hospital will be built in our city.
我们城市将要修建一家新医院。
4. 现在进行时的被动语态构成：am / is / are + being + 及物动词的过去分词
Uncle Wang is mending my bike now.→
My bike is being repaired by Tom now.
王叔叔正在修理我的自行车。
5. 现在完成时的被动语态构成：has / have + been + 及物动词的过去分词
This book has been translated into many languages.
这本书被翻译成多种文字。
Many man-made satellites have been sent up into space by many countries.
在许多国家有许多人造卫星被送上了太空。
6.过去进行时的被动语态构成：was/were + being + 及物动词的过去分词
The new road was being made.
这条新路正在修筑。
7.过去完成时的被动语态构成：had + been + 及物动词的过去分词
The classroom hadn’t been cleaned before the teacher came.
在老师来之前，教室尚未打扫。
8.将来完成时的被动语态构成：shall/will + have done
They will have been married for 20 years by then.
届时，他们结婚将满20周年。
9.含有情态动词的被动语态构成：情态动词 + be + 及物动词的过去分词
Young trees must be watered often.
小树需要经常浇水。
二、 怎样把主动语态改成被动语态?
把主动语态改为被动语态非常简单，可以遵循以下几个步骤：
1. 先找出谓语动词；
2. 再找出谓语动词后的宾语；
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