F．含有宾语从句的主动句变被动句
带有宾语从句的句子变成被动语态时，通常用it来作为被动句的形式主语，宾语从句保留不变。
They said that he had gone abroad to study English. 他们说他出国学英语去了。 -- It was said that he had gone abroad to study English. 据说他出国学英语去了。 We haven't decided when we should go camping. 我们还未决定什么时候去野营。 -- It hasn't been decided when we should go camping. 什么时候去野营尚未决定。 提示：
带有宾语从句的句子变成被动语态时，为了简练，还可把从句的主语变为被动句的主语，从句的谓语部分还可以变为不定式短语。
We believed that he would succeed. 我们相信他会成功。 -- He was believed to succeed. 人们相信他会成功。
Father expected that I should become an engineer. 父亲希望我成为工程师。 -- I was expected (by my father) to become an engineer. （父亲）希望我成为工程师。
G．祈使句的被动语态
肯定的祈使句的被动语态结构是：Let + 宾语 + be + 过去分词；否定的祈使句的被动语态结构是：Don't + let + 宾语 + be + 过去分词（或Let + 宾语 + not + be + 过去分词）。
Move the desks into the corridor.
-- Let the desks be moved into the corridor. 把课桌搬到走廊去。 Don't trust her.
-- Don't let her be trusted.
-- Let her not be trusted. 不要相信她。 H. 动词短语构成的被动语态
一般情况下，只有及物动词才能跟宾语，而不及物动词不能跟宾语，所以只有及物动词才有被动语态，不及物动词则没有被动语态。但有些不及物动词后面跟上介词或副词后，变成一个动词短语，相当于一个及物动词，因此就可以有被动语态。 The nurses in this hospital look after the patients very well.
-- The patients are well looked after by the nurses in this hospital. 病人在这所医院里被护士们照料得很周到。
They have put off the meeting till next Saturday.
-- The meeting has been put off till next Saturday. 会议已推迟到下周六了。 注意：
在使用被动语态时，千万不要遗漏句末的介词或副词。
Such a bad habit should be got rid of. 这样的坏习惯应该改掉。
All the important matters have now been attended to. 所有重要的事情都得到了处理。
I. 双重被动结构
双重被动结构指的是句中谓语动词和其后的不定式均为被动结构，句子的主语既是谓语动词的承受者，同时又是不定式动作的承受者。 They asked us to discuss the problem at once. -- We were asked to discuss the problem at once.
-- The problem was asked to be discussed at once. 这个问题被要求立刻讨论。（双重被动）
She offered to buy a recorder for me.
-- A recorder was offered to be bought for me. 有人提出要帮我买一台录音机。（双重被动）
The teacher ordered that we should take the desk away.
-- The desk was ordered to be taken away. 课桌被要求搬走。（双重被动） J．下列句子变成被动语态时，要用with，不用by Smoke filled the meeting room. 烟充满了会议室。
The meeting room was filled with smoke. 会议室里充满了烟。 A cloth covered the table. 一块布把桌子罩了起来。 The table was covered with a cloth. 桌子上铺着一块布。 K．不能变为被动语态的结构 1．受动词的限制
①表示状态的及物动词，只能用于主动语态。
某些表示状态的及物动词，如have, own, cost, lack, want (缺乏), become (适合), fit,
resemble, fail, last, flee, benefit, hold等作谓语时，不能变为被动句。 She resembles her mother. 她像她妈妈。 He lacks self-confidence. 他缺乏自信。
This hall can hold 2,000 people. 这个大厅能容纳两千人。
②当及物动词have表示“吃饭”、“患病”、“明白”、“知道”等意思时，没有被动语态形式。
Would you have a cup of tea 你要喝杯茶吗？
She had a bad cold yesterday, and now she is feeling much better. 昨天她得了重感冒，现在好多了。
③当动词get，take表示“懂得”、“知道”，owe表示“欠”，cost表示“使失去(生命、健康等)”的意思时，动词没有相应的被动语态。 Do you get me 你明白我的意思吗？
How do you take this passage 这段话你怎么理解？ I owe 50 pounds to you. 我欠你五十英镑。
His careless driving cost his life. 他粗心的驾驶使他丧了命。 2．受宾语的限制
①当宾语是相互代词、反身代词或具有类似相互代词的关系时，动词不能用于被动语态形式。
They simply cannot contain themselves for joy. 他们简直无法抑制内心的喜悦。 He absented himself from a meeting yesterday. 他昨天缺席会议了。
For years the two sisters looked after one another. 多年来两姐妹互相照顾。 ②当宾语前带有主语的形容词性物主代词时，谓语动词通常不能转换为被动语态。 I could not believe my eyes when I saw him still alive. 看到他还活着，我简直不相信自己的眼睛。
The doctor shook his head and then went out without any words. 医生摇了摇头，一句话也没说就出去了。 注意：
动词的宾语是身体的一部分，一般不可变为被动语态，但也有例外。 He fixed his eyes on the oil painting. 他注视着这幅油画。
-- His eyes were fixed on the oil painting. 他的两眼注视着这幅油画。
③当宾语起状语作用，表示数量、重量、大小或程度时，不能用被动语态。 This kind of dictionary costs ten dollars. 这种字典价值十美元。 The case weighs twenty kilos. 这箱子重二十公斤。 ④当宾语是同源宾语时，通常不能转换成被动语态。 He laughed a hearty laugh. 他由衷地笑了笑。 She dreamt a sweet dream. 她做了一个美梦。
⑤如果宾语是动词不定式或动词的-ing形式时，谓语动词一般不能变换成被动语态。 He admitted having done wrong. 他承认做错了。
He has decided to go and study abroad. 他已决定出国留学。
⑥如果enter, leave, reach的宾语是地点、国家机关等，不能改为被动语态 He left the army in 1998. 他1998年退伍。
She entered the hall at once. 她立刻就进入了大厅。
⑦另外，不可拆开的短语动词，如take place, lose heart, belong to, consist of, change colour等，也不能改为被动语态。 The book belongs to me. 这本书是我的。 She caught a very bad cold. 她患了重感冒。 必背：一些常见的不能变为被动语态的动宾词组 catch a cold 感冒 eat one's words 食言 lose heart 丧失信心 lose patience 失去耐心 make a face 做鬼脸 make up one's mind 决心 make bed 铺床
make room for 为??腾出地方 keep watch 守望
keep silence 保持安静 speak one's mind 表明见解 take place 发生
take one's time 从容不迫，别着急
take office 就职 take one's leave 请假 take notes 作笔记 take up arms 拿起武器 take one's place 就位
⑧含有would rather或情态动词dare的句子，不能改为被动语态。 I would rather do it now. 我宁可现在就干这件事。 He dare not do it. 他不敢干那件事。
四、被动语态与系表结构
所谓系表结构，在此指“连系动词+用作表语的动词-ed形式”结构。它与被动语态的形式完全一样，所以在应用时应注意它们的区别。
A. 被动语态中的过去分词是动词，多强调动作；系表结构中的过去分词相当于形容词，多强调状态。前者通常可用by+人或by+抽象名词表动作的执行者，而后者则一般不用。 The gate to the garden was locked by the girl. 花园门被那个女孩锁上了。（被动结构）
The gate to the garden was locked. 花园门锁了。（系表结构）
The tree was blown down by the high winds. 那棵树被大风吹倒了。（被动结构） The tree was blown down when we saw it. 我们看到那棵树时，它已经被吹倒了。（系表结构） 注意：
少数“连系动词be + 用作表语的动词-ed形式”也带by短语。
The old man was surrounded by small children. 老人被孩子们团团围住。（被动语态） Guilin is surrounded by hills and mountains. 桂林周围都是山。（系表结构） We were held up by fog. 我们因雾受阻。（被动语态）
The tree is known by its fruit. 看到果子就知道是什么树。（系表结构）
B. 系表结构一般只用于一般现在时、一般过去时等少数几种时态；而被动语态可用多种时态。
The composition is well written. 这篇作文写得很好。（系表结构） The composition is being written. 这篇作文正在写。（被动语态）
高中英语语法大全
