初三英语被动语态的用法及构成全一点

（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”构成。人称、数和时态的变化是通过be的变化表现出来的。现以teach为例说明被动语态在各种时态中的构成。
一般现在时：am／is／are＋taught
一般过去时：was／were＋taught
一般将来时：will／shall be＋taught
现在进行时：am／is／are being＋taught
过去进行时：have／has been＋taught
现在完成时：have／has been＋taught
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。
注意：表示“使、让”的动词make, have等，以及感官动词see, watch, observe, feel, hear, listen to, look at等，在主动语态中，接不定式做宾语补足语时，不定式前的 to 要省略，而变为被动语态时，成为主语补足语的不定式，则必须带to。如：
I saw him go into the teachers’office. →He was seen to go into the teachers’office.
看见他进入了教师办公室。
(3) 带双宾语的句子变为被动语态时，既可将直接宾语变为被动语态的主语，而在间接宾语前加to 或for留在动词之后；也可将间接宾语变为被动结构的主语，而直接宾语留在动词之后。但一般采用后一种用法。如：
He gave me the pen last year. →I was given the pen last year. / The pen was given to me last year. 这支笔是去年给我的。
【说明】一般说来，间接宾语前带to的动词有：bring, give, hand, lend, offer, pass, post, send, show, take, teach, tell, write, throw等；间接宾语前带for的动词有：book, buy, call, cook, do, get, make, save等。
(4) 动词believe, consider, declare, expect, know, report, say, suppose, think等的被动语态，常有两种结构形式。如：
He was said to get hurt in the car accident. 人们说他在车祸中受伤了。
It was said that he got hurt in the car accident. 人们说他在车祸中受伤了。
(5) 短语动词变被动语态时，短语动词后面的介词或副词不能省略。如：
She has never been operated on before. 她从未动过手术。
The baby was looked after by her sister. 这婴儿由她的姐姐照顾。
His plan was laughed at by everyone. 他的计划大家都嘲笑。
（6）动词不定式的被动语态：即把to do 变成to be done
（五）不用被动语态的情况
1) 不及物动词或动词短语无被动语态：
appear, die, disappear, end , fail, happen, last, lie, remain, sit, spread, stand ,break out, come true, fall asleep, keep silence, lose heart, take place.
After the fire, very little remained of my house.
比较： rise, fall, happen是不及物动词；raise, seat是及物动词。
(错) The price has been risen.
(对) The price has risen.
(错) The accident was happened last week.
(对) The accident happened last week.
(错) The price has raised.
(对) The price has been raised.
(错) Please seat.
(对) Please be seated.
要想正确地使用被动语态，就须注意哪些动词是及物的，哪些是不及物的。特别是一词多义的动词往往有两种用法。解决这一问题唯有在学习过程中多留意积累。
2) 不能用于被动语态的及物动词或动词短语：
fit, have, hold, marry, own, wish, cost, notice, watch agree with, arrive at / in, shake hands with, succeed in, suffer from, happen to, take part in, walk into, belong to
This key just fits the lock.
Your story agrees with what had already been heard.
3) 系动词无被动语态：
appear, be become, fall, feel, get, grow, keep, look, remain, seem, smell, sound, stay, taste, turn
It sounds good.
4) 带同源宾语的及物动词，反身代词，相互代词，不能用于被动语态： die, death, dream, live, life
She dreamed a bad dream last night.
5) 当宾语是不定式时，很少用于被动语态。
(对) She likes to swim.
(错) To swim is liked by her.

楼上两人回答十分完整，补充一下
情态动词的被动语态：情态动词+be done
如should be done（过去分词）

我是大侠,被动语态的主
动脉是：主语（人、物、事）+ Vt 的过去分词,英语常用八大时态的构成:
一般现在时:is/am/are +done
一般过去时:was/were +done
一般将来时:will be +done
过去将来时:would be +done
现在进行时:is/am/are being +done
过去进行时:was/were being +done
现在完成时:has/have been +done
过去完成时:had been +done
被动语态的核心就是be + done,但be 根据时态有各种变化,一定把这些公式记牢,但是目前中考常考带有情态动词的被动语态：can / may / must be + Vt 的过去分词,另外,你要熟练运用一些常用动词的四种变形（尤其是不规则动词）,才能玩英语于股掌之间.祝你轻松应对各种考验!

一般现在时is/am/are +done
一般过去时was/were +done
一般将来时will be +done
过去将来时would be +done
现在进行时is/am/are being +done
过去进行时was/were being +done
现在完成时has/have been +done
过去完成时had been +done
被动语态的核心就是 be + done,但be 根据时态有各种变化！