肯定句式：be +done (及物动词的过去分词)
如果是不及物动词 + 相应的介词或副词
否定句式：be +not +done
被动语态中的be为助动词，无意义。be可能是am , is , are也可能是was ,were或原形be。
1.The song is liked by young people. (肯定句)
2.The song isn’t liked by young people.(否定句)
3. Is the song liked by young people ?(一般疑问句)
4.Who is the song liked by ?=By whom is the song liked?(特殊疑问句)
动词的被动形式：am/is /are done
例句：He is asked to do this.
例句：The story was told by her mother.
动词的被动形式：will /shall be done
Is/are going to
例句：The problem will be discussed tomorrow.
动词的被动形式：should/would be done
Was/were are going to
例句：He said the trees would be planted soon.
动词的被动形式：am/is/are being done
例句：The novel is being written.
动词的被动形式：was/were being done
例句：At that time the desk was being made.】
动词的被动形式：has/have been done
例句：The house has been built.
动词的被动形式：had been done
例句：They said that their work had been finished.
含有情态动词的被动语态:情态动词+be+ done Your homework must be handed in today.
It is said that ……..
It is well known that …….
It is reported that……
①History is made by the people. (一般现在时)
②The cars were made in Tianjin in 1995. (一般过去时)
③The tree will be cut down next year.(一般将来时)
④The room must be kept clean.(含有情态动词的被动语态)
⑤The door is being opened.(现在进行时)
⑥The film has been seen by me.(现在完成时)
Eg: A stranger was killed last night.
Eg: The story is told everywhere in the city.