被动语态的用法及练习
（一）语态的基本概念和种类
语态是动词的一种形式，用来表明主语与谓语动词之间的关系。所以英语的语态是通过动词形式的变化表现出来的。语态有两种：主动语态和被动语态。主语是动作的发出者为主动语态；主语是动作的接受者为被动语态。
如：They built the bridge.
The bridge was built by them.
(二)被动语态的构成
被动语态由“助动词be＋及物动词的过去分词+by+施动者”构成。人称、数和时态的变化是通过be的变化表现出来的。
1. 一般现在时的被动语态. am / is / are + 动词的过去分词
Our classroom is cleaned every day.
This car is made in China.
2、一般过去式的被动语态: was / were + 动词的过去分词
His desk was cleaned just now.
The station was built in 1928.
3、现在进行时的被动语态: am / is / are + being + 动词的过去分词
A new factory is being built in our city now.
Some trees are being cut down in the park.
4、过去进行时的被动语态: was / were + being + 动词的过去分词
A new factory was being built in our city at that time.
Some babies were being looked after by Miss Chen last year.
5、一般将来时的被动语态:
(A) will / shall + be + 动词的过去分词
(B) am / is / are + going to be +动词的过去分词.
Some new factories will be built in our city this year.
Your watch is going to be mended in an hour.
6、过去将来时的被动语态: (1).would / should + be + 动词的过去分词(2).was / were +going to be + 动词的过去分词.
She said that some new factories would be built soon in our city.
He thought that your watch was going to be mended after an hour.
7、现在完成时的被动语态:have / has + been + 动词的过去分词
Some new factories have been built in the city since last year.
Your watch has been mended already.
8、过去完成时的被动语态:had + been + 动词的过去分词
He said that some new factories had been built in the city.
I didn’t know that my watch had been mended .
9、含情态动词的被动式：can/may/must + be + done
例如：He can not be found. / I must be paid for this.
歌诀是：被动语态be字变，过去分词跟后面。
情态动词的被动语态是常考的一个知识点：情态动词+be+过去分词
(三)被动语态的用法
1)不知道或没有必要说明动作的执行者是谁。例如：
Some new computers were stolen last night. 一些新电脑在昨晚被盗了。(不知道电脑是谁偷的)
This book was published in 1981. 这本书出版于1981年。
(2)强调动作的承受者，而不强调动作的执行者。例如：
the window was broken by Mike. 窗户是迈克打破的。
This book was written by him. 这本书是他写的。
Eight hours per day for sleep must be guaranteed. 每天8小时睡眠必须得到保证。歌诀：谁做的动作不知道，说出谁做的没有必要；动作承受者需强调，被动语态运用到
（四）主动语态变被动语态的方法与注意事项
歌诀是：宾变主，主变宾，by短语后面跟。谓语动词变被动，be后“过分”来使用。
(1) 通常的办法是：将主动结构中的宾语变为被动结构中的主语，将主动结构中的谓语动词变为“be / get +过去分词”形式，将主动结构中的主语变为介词by的宾语(若动作的执行者没有必要说明则可以省略该by短语)。如：
Li Lei planted the tree last year. →The tree was planted by Li Lei last year. 这棵树是李蕾去年栽的。
Workers made the machines in Changsha. →The machines were made in Changsha. 这些机器是长沙造的。
(2) 将含有复合宾语的句子变为被动语态时，应将宾语变为被动结构的主语，而宾语的补足语则留在原处成为主语补足语。如：
He painted the door green yesterday. →The door was painted green yesterday. 昨天门被漆成绿色了。
