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
例句:The problem will be discussed tomorrow.
动词的被动形式:should/would be done
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.
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.