被动语态表示主语是动作的承受者，结构是"be + 过去分词"。口诀：被动语态 be done，时态人称变 be 字。
顺口溜记忆
- 被动语态 be done，be 有人称时数变
- 一般现在 am/is/are done
- 一般过去 was/were done
- 一般将来 will be done，含情态动词 can be done
- 现在完成 have/has been done，进行时 be being done
要点讲解
- 被动语态结构：be + 及物动词的过去分词
- 一般现在时：English is spoken in many countries. 许多国家说英语。
- 一般过去时：The bridge was built in 2000. 这座桥建于2000年。
- 一般将来时：The meeting will be held tomorrow. 会议明天举行。
- 含情态动词：The work must be finished today. 这项工作今天必须完成。
- 含双宾语：间接宾语变主语时，直接宾语保留：I was given a book. / A book was given to me.
例句解析
- The classroom is cleaned every day. 教室每天都被打扫。
- This song was written by a famous singer. 这首歌是一位著名歌手写的。
- The trees can be planted in spring. 树可以在春天种。
- My bike has been repaired. 我的自行车已经被修好了。
易错提醒
- 只有及物动词才能用于被动语态；不及物动词如 happen、appear 没有被动形式。