被动语态的结构主要由两部分组成： 助动词be和 及物动词的过去分词。根据时态的不同，助动词be会发生变化，而及物动词的过去分词保持不变。以下是被动语态的各种时态结构：
一般现在时
结构：主语 + am/is/are + 过去分词
例句：The book is written by a famous author.
一般过去时
结构：主语 + was/were + 过去分词
例句：The letter was sent yesterday.
一般将来时
结构：主语 + will be + 过去分词
例句：The meeting will be held tomorrow.
现在进行时
结构：主语 + am/is/are + being + 过去分词
例句：The house is being cleaned.
现在完成时
结构：主语 + have/has been + 过去分词
例句：The work has been finished.
过去进行时
结构：主语 + was/were + being + 过去分词
例句：The cake was being eaten.
过去完成时
结构：主语 + had been + 过去分词
例句：The meeting had already ended when I arrived.
情态动词的被动语态
结构：情态动词 + be + 过去分词
例句：The book should be returned by the borrower.
通过这些结构，可以灵活地表达主语与谓语动词之间的被动关系。希望这些信息对你有所帮助!