英语的语态有两种：主动语态和被动语态。主动语态用于主动句，表示主语是动作的执行者。被动语态用于被动句，表示主语是动作的承受者。主动语态的构成方式与动词时态相同，而被动语态由助动词“be+过去分词”构成，有人称、数、时态的变化。例如：
一般现在时：You are required to do this.
一般过去时：The window was broken by Xiao Ming.
一般将来时：The problem will be discussed tomorrow.
现在进行时：The road is being widened.
过去进行时：The new tool was being made.
现在完成时：The door has been painted.
过去完成时：He said that the work had been finished.
过去将来时：He said that the trees would be planted.

1. 带情态动词的被动结构 
The problem must be solved soon. 这个问题必须尽快解决。

2. 带不定式的被动结构
Betty has never been heard to speak ill of others. 从未听到贝蒂说别人坏话。
This task needs to be done with great care.这项工作必须认真去做。

3. 短语动词的被动语态
    短语动词是一个整体，不可丢掉后面的介词或副词。例如：
My sister will be taken care of by Grandma. 我妹妹由奶奶照顾。
Such a thing has never been heard of before. 这样的事闻所未闻。

4. 表示"据说"或"相信" 的词组，基本上由believe, consider, declare, expect, feel , report, say, see, suppose, think, understand等组成。例如：
    It is said that… 据说　　
    It is reported that… 据报道　　　
    It is believed that… 大家相信　　　　　
    It is hoped that… 大家希望
    It is well known that… 众所周知　　
    It is thought that… 大家认为
    It is suggested that… 据建议　　　　　
    It is taken granted that… 被视为当然　
    It has been decided that… 大家决定　　
    It must be remember that… 务必记住的是