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（一）We clean the classroom every day.（主动）
Classroom is cleaned by us every day.(被动)
（二）They built a new bridge over the river. (主动)
A new bridge was built over the river. (被动)
被动语态的基本用法
（一）需要强调动作的承受者时
English is widely spoken in the world now.
（二）不知道或没必要指出动作的执行者时
Mr. Wang is invited to the meeting today.
（三）当说话人需要强调客观时
It is said that she was a beauty when she was young .
几种常用时态的被动语态的构成及其用法
1.一般现在时的被动语态:
is/am/are+及物动词的过去分词。
如：English is spoken by many people.
2.一般过去时的被动语态:
was/were+及物动词的过去分词
如：The bridge was built a few years ago.
3.含有情态动词的被动语态：
情态动词+be+及物动词的过去分词：如: Your homework must be finished.
4.一般将来时的被动语态:
will be +及物动词的过去分词
如：The building will be finished next year.
5.现在完成时的被动语态has/have+been+ 及物动词的过去分词.
如：The work has been done by us.
6.现在进行时的被动语态：
is/am/are being+及物动词的过去分词。如: The work is being done by workers.
自学指导二
1.写出下面动词的过去分词(3’)
2.掌握被动变主动的步骤（3’）