? ?
He was heard to say good-bye to his friends. 他被听到向朋友们道别。
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。 情态动词 Can/could May/might must have/had to will/would shall/should ought to 主动形式 Can/could do May/might do must do have/had to do will/would do shall/should do ought to do 被动形式 Can/could be done May/might be done
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must be done have/had to be done will/would be done shall/should be done ought to be done
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。
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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
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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）
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