被动语态是英语语法中的重要形式，表示主语是动作的承受者。九种常用的被动语态形式包括现在被动语态、过去被动语态、现在完成被动语态、过去完成被动语态、将来被动语态、现在进行时被动语态、过去进行时被动语态、现在完成进行时被动语态和过去完成进行时被动语态。
以下是九种被动语态的常用形式：
-
现在被动语态：be + 过去分词
例句：The book is being read by me. （这本书正在被我阅读。）
-
过去被动语态：was/were + 过去分词
例句：The cake was eaten by them. （这个蛋糕被他们吃了。）
-
现在完成被动语态：have/has been + 过去分词
例句：The work has been finished by him. （这项工作已经被他完成了。）
-
过去完成被动语态：had been + 过去分词
例句：The letter had been written by her before I arrived. （这封信在我到达之前已经被她写了。）
-
将来被动语态：will be + 过去分词
例句：The car will be repaired by the mechanic. （这辆车将被修理工修理。）
-
现在进行时被动语态：am/is/are being + 过去分词
例句：The house is being cleaned by them. （这个房子正在被他们打扫。）
-
过去进行时被动语态：was/were being + 过去分词
例句：The song was being sung by the choir when I entered the room. （当我进入房间时，合唱团正在唱这首歌。）
-
现在完成进行时被动语态：have/has been being + 过去分词
例句：The project has been being worked on by the team for months. （这个项目已经被团队进行了数月。）
-
过去完成进行时被动语态：had been being + 过去分词
例句：The movie had been being watched by them for two hours before it ended. （这部电影在结束前他们已经看了两个小时了。）
