D .含有情态动词的主动句变被动句
含有情态动词的谓语变成被动语态时，用“情态动词+ be done ”构成。
The machine must be operated with care .这机器必须小心操作。
Such a sentence ought not to be used here .这个句子不应该用在这里。
What's done cannot be undone .覆水难收。
People had to be reminded of the danger that night .那天晚上必须提醒人们当心危险。
E .含有“ be going to do ”和“ be to do ”等结构的主动句变被动句
含有“ be going to do 和 be to do 等结构的谓语动词，变成被动语态时，分别用“ be going to + be done ”和“ be to + be done ”。在这两种结构中， be 只有一般现在时和一般过去时两种形式。
The problem is going to be discussed at the meeting .这个问题将在会上讨论。
This new film is to be shown on， TV next week .这部新片下周将在电视上放映。
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有，拥有，花费 lack( 缺乏 ) want 想要 become 成为 fit ( 适合 ) resemble fail last 类似于，失败，足够维持，flee benefit hold 逃跑，受益，保持等作谓语时，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 two thousand 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 fifty 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。