主动句转被动句练习题 2

主动句转被动句

1.His mother told him not to waste time on fishing.

2. Father gave me a toy at Christmas.

3 .This factory produces machine tools.

4 .They should do it at once.

5 .He is reading an English book.

6. They named the child Tom.

7.He was doing his homework at 6:00 yesterday.

8.I will water the flowers later.

9.I have repaired my car.

10.He had finished the job when the manager came in.

被动语态：主动表被动形式

被动语态：主动表被动形式 1) 当open, close, shut, lock, move等用作不及物动词且表示主语的某种属性时，通常用主动形式表示被动意义： The door won’t shut. 这门关不上。 The supermarket doors shut automatically. 超市的门是自动关的。【注】该用法的不及物动词通常与can’t, won’t 等连用，注意它与用被动语态含义不同：The window won’t shut. 这窗户关不上。(说明主语的属性——窗户有问题了) The window won’t be shut. 这窗户将不用关上。(窗户本身没问题，只是不用关) 有时可能用主动和被动形式均可，只是强调重点稍有不同：Suddenly the door opened. 突然门开了。(不强调动作执行者) The door was suddenly opened. 门突然被打开了。(强调动作执行者) 2)当read, wash,clean, cook, cut, wear, carry，sell 等用作不及物动词且表示主语的某种属性时，通常要用主动形式表示被动意义： The cloth washes well. 这种布料好洗。

The book sells quickly. 这书销售得快。 This cheese doesn’t cut easily. It’s too soft. 这乳酪不容易切，太软了。 This shirt will wear very long. 这衬衫可以穿很久。【注】该用法通常与well, easily, slowly, quickly等副词连用，并且在用于以上意思时通常不宜直接使用被动语态形式。不过在某些特殊情况下也可用被动语态，只是含义稍有不同(用主动形式表示主语的属性，用被动形式表示动作执行者所执行的动作)：The sentences read clearly. 这些句子读起来很清楚。(即这句子没有歧义) The sentences are read clearly. 这些句子被读得很清楚。(指读的人读得好) 另外，以上用法有时也可能用于进行时态： The vegetables are cooking.蔬菜正在煮着。 Is the book selling well? 这书销售情况如何? (3)某些表示开始和结束的动词(begin,start, finish, end等)，当主语为事物且不强调动作的执行者时，可用主动形式表示被动意义： When does the concertbegin? 音乐会什么时候开始？ The play ended at ten o’clock. 戏10点钟结束。

主动形式表示被动意义的十二种情况

主动形式表示被动意义的十二种情况英语的被动意义除了用及物动词的被动语态形式表示外，还可以用其他方法来表示，就像在汉语中并非一定要用“被”字来表示的被动意义一样。我们把这种用法称之为“主动表被动”，下面笔者就这种可以用主动形式表示被动意义的场合归纳如下。 1．用某些不及物动词表示被动意义，如：carry, cut, drive, iron, keep, lock, open, pick, read, shut, tear, wash, wear, write等等。这类动词既能作及物动词，也能做不及物动词。作不及物动词时，形式上虽为主动，却表示被动意义。例如：Meat cuts easily.肉容易切。 His novel sells well.他的小说畅销。 The car drove easily.这车很容易开。 Your pen writes quite smoothly.你的笔写起来很滑。 2．某些表示感觉动词的动词可以用主动形式表示被动意义。例如： This shirt feels much softer than that one. 这件衬衫比那件衬衫摸起来柔软得多。 That book smells old.那本书有一股霉味。 These oranges taste nice.这些橙子味道很好。 3．有少数动词(bind, cook, do, owe, print)的进行时有时有被动意义。在这种用法中，句子的主语都一般是指物的。例如： The magazine is binding(printing).这本杂志正在装订(印刷)。 He paid all that was owing.欠的钱他都还了。 The meat is cooking.正在火敦肉。 4．动词get, come, go之后接过去分词，表示被动意义。get的这种用法局限于口语和非正式的书面语言，更强调动作的结果而非动作本身，并常用来表示突发性的、出乎意料的偶然事件。而come和go常接含否定意义的过去分词。例如： After working selflessly in here for several years, Mr Li got promoted at last.李先生在此地无私地干了好几年，终于得到提升。 They got delayed because of the holiday traffic. 由于节日交通阻塞，他们被耽误了。 The buttons on my coat came undone.我上衣的扣子松开了。 The woman's complaints went unnoticed.那位女士的投诉无人理睬。 5．在need(want, require, deserve, etc.)doing句型中，动名词(doing)相当于动词不定式的被动式(to be done)，在意思上没有多大差别。例如： The garden needs watering(to be watered).花园需要浇水。 The problem requires studying(to be studied) with great care. 这个问题需要仔细研究。 These jobs want doing(to be done) at once. 这些工作需要马上就做。 6.在bear doing, stand doing, be worth doing结构中习惯上用动名词形式，而不用动词不定式。其中值得注意的是，在be worth doing句型中，只能用动名词的主动式，而在be worthy to be done中，才能用动词不定式的被动式，两者不可混淆。例如：

被动语态练习题及_主动句转被动句

把下列句子变成被动语态 1.We found some jewels in a box. 2. The teacher is keeping the pupils at school for a revision. 3. James has left a parcel for you. 4. You must finish the article before Friday. 5. They will not paint the house again next year. 6. They promised Mary a new doll for her birthday. 7. I have told the children many times not to skate on the pond. 8. Where did he translate the story? 9. We had to repair our TV set. 10. Do they take good care of the sick? 11. They company has paid the workers very handsome wages. 12. They showed me the room where they lived. 把下列句子变成主动语态 1.Spanish is spoken in South America. 2. The plans will have to be revised. 3. All the words must be looked up in a dictionary. 4. Has John been cured of his heart illness? 5. The door should not have been left open all night. 6. We are afraid that we may be attacked at night. 7. We are being taught how to operate the new machine. 用动词的正确时态填空 Our desks and chairs ________________ (make) of wood. The paper of books and newspapers ______ also ___________ (make) from wood. Even some kinds of cloth __________________ (make) from it. Many people ____________ (burn) wood to keep themselves warm in winter. Indeed, wood _______ (be) important in our everyday life. Where ________ wood __________ (come) from? It ________________ (take) from trees which _____________(grow) in the mountains. _________ you ____________ (know) how it ____________ (get) to us from the mountains? First of all, trees ___________(cut) down when they ______________(grow) big enough. Then their branches _______________ (cut) off, and logs _______________(make).These heavy logs ________________(put)

主动形式表被动含义

我是英语专业的，或许能帮助你~！！楼主记得给分啊~！！2011—12--23 主动语态形式表示被动意义在初三英语教学当中，被动语态的学习是一个重点，学生常常在做选择填空和完形填空当中，会遇到一些用主动语态形式表示被动意义的题目，他们常常会犯一些错误。例如以下的一道选择题：The cotton very soft.（棉花摸起来很软）A、is felt B、feels C、was felt D、feel这道题的正确答案是B，而往往很多同学选择A。他们觉得应该用被动结构，其实这就是一个典型的“某些表示状态特征的系动词，就是用主动语态形式表示被动意义”的题目。为了避免学生再遇到类似的问题，犯同样的错误，本人觉得在初三复习当中，在不增加学生过多负担下，有必要将一些初中学生接触过的这一方面的内容，做一下简单的归纳。英语中主动语态形式并不都表示主动意义，有时可表示被动意义，因为被动语态不如主动语态用得普遍，在不引起误解的情况下，可用主动语态表示被动意义。常见的有以下几种情况。一、某些表示状态特征的系动词，如：look，sound，smell，taste等用主动语态形式表示被动意义。如：This kind of cloth feels very soft.这种布料摸起来很软。The music sounds beautiful. 这音乐听起来很美。The cake smells nice. 这蛋糕闻起来香。The meat tastes terrible. 这肉尝起来变味了。二、表示某些“需要、要求”意义的动词，如need、want、require等后的动名词的主动语态形式表示被动意义。如：The bike needs mending. 这辆自行车需要修理。Your hair wants cutting. 你的头发该理了。The story requires reading carefully.这篇故事需要仔细阅读。三、形容词worth后接的动名词用主动语态形式表示被动意义。The book is well worth reading. 这本书很值得读。The clock isn’t worth repairing. 这闹钟不值得修。The film is worth seeing. 这部电影值得一看。四、作表语的形容词，如difficult，easy，hard，nice，possible，impossible等之后的不定式作状语时，用主动语态形式表示被动意义。此时，不定式表示的动作与其主语一般为动宾关系。如：Is English difficult to learn? 英语难学吗？The maths problem is not easy to work out.这道数学题不容易解。I think apples are nice to eat.我认为苹果好吃。五、某些动词，如：lock，open，sell，wash等，特别是与副词badly，easily，well等连用时，常常用主动语态形式表示被动意义。如：The door won’t lock. 这门锁不上。This kind of colour TV sells well. 这种彩电很畅销。Does the cloth wash well？这布耐洗吗？The shop opens at eight in the morning.商店早上八点开门。六、不定式作定语，与被修饰动词的名词或代词构成被动关系，表示被动意义。如：I have lots of homework to do today.今天我有许多家庭作业要做。I want to get something to drink. 我想弄点喝的。Would you like something to eat？你想要点吃的吗？当然“学无定法”，英语的学习不能靠死记规则，关键要提高语感，真正养成用英语思维的习惯，才能做到活学活用。

被动语态用主动表达

被动语态用主动表达被动语态是指在不知谁是动作执行者或没必要指出谁是动作执行者，或需要强调动作的承受者时使用，其基本形式是“系动词+过去分词”。但在现实语言运用中，会出现一些用主动形式表达被动含义的情况，现将英语中用主动语态表达被动含义的几种情况归纳如下：1. 表“需要”含义的动词，如need, want, require等作谓语时，其主语若是物时，这些动词后面可接动名词主动形式表示被动含义。如： The garden doesn't need watering, it rained last night. 这个园子不需要浇水，昨晚刚下过雨。The carpet really requires cleaning. 这块地毯确实需要清理了。注：这种情况下，也可接不定式的被动语态表达同种含义。如： This sentence needs explaining once more.=This sentence needs to be explained once more. 这个句子需要再解释一遍。 2. 有一类动词既是及物的，又是不及物的，但如果表示主语内在的特征、性质或所处的状态而不是强调动作本身，就要用动词的主动形式表被动，这样用起来简洁，符合英美人的习惯。常见的动词有：sell, wash, write, wear, open, shut, lock, close, start, begin, read, tear, boil, burn, grow, break, change, weigh, measure等。请看下面三个句子，体会划线部分的不同： His books sell well, so they are sold out soon. 他的书很畅销，所以很快就被卖光了。 The door won't open, so we'll ask the repairman to open it. 这门就是打不开，所以，我们将请修理工打开它。 We measured the bridge and it measures 20 metres long! 我们量了量这座桥，它(量起来)有20米长！ 3. 一些表示感觉、感官的系动词，常用主动形式表示被动动作，如sound, feel, smell, taste, look等。如： I tasted the wine and it tasted wonderful! 我尝了尝这酒，味道棒极了。 4. be worth doing结构中，用动名词主动形式表示某事值得被做。如： This dictionary is expensive, but it is worth buying. 这本词典很贵，但很值得买。 5. 在be to blame, be to let, be to seek等结构中，也用主动形式表被动含义。如： Nobody is to blame for the accident. 没有人会因这个事故而受责怪。 6. 有些动词的进行时可表示被动含义(这种情况也可用被动)。如： Te new edition of Longman dictionary is printing. 朗文词典的新版本正在被印刷。 7. 动词不定式的主动形式表被动含义。动词不定式主动形式表被动含义较复杂，一般分下面3种情况： (1)be+形容词(或有这种形容词修饰的名词)+to do，这时的形容词都表示主语所具有的特征。如：heavy, light, big, strong, nice, beautiful, easy, hard, difficult, fit, comfortable, dangerous 等。如： She is a nice person to work with. 她是一个很好共事的人。注：①此种结构中，因为主语充当着不定式的逻辑宾语，所以不定式一定用及物动词或相当于及物动词的短语。②too+形容词+to do及形容词+enough+to do结构也适合这一类。如：

[精]主动语态变被动语态时所注意的问题

主动语态变被动语态时所注意的问题1. 把主动语态变为被动语态，其谓语动词的时态要与原句时态保持一致，其谓语动词的数要与新主语保持一致。 We have bought a new computer. A new computer has been bought. A new computer have been bought. （错误） 2. 含有双宾语的主动句变被动句时，可分别将其中的一个宾语变为主语，另一个不动，一般变间接宾语为主语时比较多 My uncle gave me a present on my birthday. I was given a present on my birthday. 如果把直接宾语(指物)改为主语，则在间接宾语(指人)前加适当的介词，如上句还可以说： A present was given to me yesterday. 注意：

1.一般在下列动词后，常在间接宾语前用介词to，如：bring, give, hand, lend, offer, pass, pay, promise, sell, show, take, teach, tell 等。 (1) The book was showed to the class. (2) My bike was lent to her. 2.一般在下列动词后，间接宾语前用介词for, 如：build, buy, cook, cut, choose, do, fetch, find, fix, get, keep, make, order, paint, play, sing 等。 (1) A new skirt was made for me. (2) The meat was cooked for us. (3) Some country music was played for us. 3. 由动词+ 介词或副词构成的短语动词，要把它们作为整体看，即把它们看成一个及物动词，介词或副词不可拆开或漏掉。这类动词有：不及物动词+ 介词，如: agree to, ask for, laugh at, operated on, listen to, look after, think of, talk about 等。 The patient is being operated on. T he problem is solved. It needn't be talked about.

主动形式表被动意义

主动形式表被动意义 1. 1)系动词没有被动形式,但有些系动词常表示被动意义。常见的有taste(吃起来), sound (听起来), prove(证明是), feel(摸上去感到)等,例如: Your reason sounds reasonable. Good medicine tastes bitter to the mouth. 2)一些与can't(不能)或won't(不会)连用的动词。常用的有: lock(锁住), shut(关上) , open(打开), act(上演)等,例如: The door won't open. It can't move. 3)一些与well(很), easily(容易地), perfectly(十分地)等连用的动词,如: sell(销售) , wash(洗), clean(打扫), burn(燃烧), cook(煮)等,例如: The book sells well. These clothes wash well. 4)用在“主语+不及物动词+主语补语”句型中的一些不及物动词,例如: This material has worn thin. The dust has blownsintosthe house. 2. 1)动名词 be worth(值得), want (=need)(需要), need(需要), require(需要)后所用的动名词,必须用主动结构表示被动意义,例如: These young seedlings will require/need looking after (=need to be looked after) carefully. Your hair wants/needs cutting (needs to be cut). 2) 作定语:不定式结构常表示动宾关系,即用不定式的主动形式表示被动意义。这种情形最常出现在“There+be+主语+修饰主语的不定式”和“及物动词+宾语(或双宾语)+修饰宾语的不定式”结构中,特别是“主语+have+宾语+修饰宾语的不定式”结构中,例如: He has a family to support. There is a lot of work to do. 当然,这里的不定式在个别情形下也可用被动形式,含义区别不大,例如: There is so much work to do/to be done. 在“主语+be+形容词+不定式”句型中,有时主语是不定式结构的逻辑宾语,这是应用主动形式表示被动含义。适合于此结构的形容词比较多,最常用的有amusing(有趣的),

动词的主动形式表示被动之意(附练习及答案)

动词的主动形式表示被动之意一、系动词无被动语态：以主动形式表示被动之意常见的系动词有： ①be 动词 ②. 起来（7 个）：look/seem/appear, feel（感觉，摸起来）,sou nd, smell, taste e.g. She seems/appears happy. It smells terrible. ③（逐渐）变得 /变成： become, grow, get, turn, come, go e.g. His wish has come true. People often went hungry in the old days. The tree is growing tall. ④保持： keep, stay e.g. We must keep quiet in the reading room. 二、下列动词（词组）没有被动式： 1、happen, take place, break out, belong to ,cost, take 2、不及物动词 sell, wash, read , write, open, close, shut, lock, wear 等，常用主动形式表示被动意义。 Ol、An accident was happened yesterday. （x）昨天发生了一起事故。 An accident happened yesterday. O2、 The flower smells sweet. 这花闻起来很香。 O3、 The watch looks good. 这表看起来很好。 O4、 This book sells well. 这本书畅销。 O5、 The kind of cloth washes well. 这种布很容易洗。 O6、 The article reads well. 这篇文章读起来很好。 O7、 The supermarket opens at 8:00 in the morning. 超市在早上八点钟营业。 08、The door won ' t close/sh这门关不上。 O9、 The door locks easily. 这门容易锁。

动名词主动表被动的三种类型

在某些特殊结构中，动名词可以用主动形式表示被动意义，这主要见于以下几种情况：一、“需要”型在need, want, require几个表示“需要”的动词后，英语习惯上用动名词的主动形式表示被动意义。如： He needs encouraging. 他需要鼓励。 Your hair wants cutting. 你需要理发了。 The front gate requires mending. 前门需要修理。从意义上看，以上三句的动名词均含有被动意味，但用的都是主动形式。不过，如果改用不定式，则要用被动式，如上面也可说成： He needs to be encouraged. 他需要鼓励。 Your hair wants to be cut. 你需要理发了。 The front gate requires to be mended. 前门需要修理。二、“值得”型这类词比较典型的有三个，它们是(be) worth, deserve, merit——它们后面跟的动名词习惯上要用主动式表示被动意义，不能直接使用被动式。如： The film is worth seeing twice. 这个片子值得看两遍。 None of it is worth keeping. 这东西一点儿也不值得保存。 They merit praising. 他们值得表扬说明：从搭配上看，be worth 和merit 后只能跟动名词，不能跟不定式；而deserve 后则通常是接不定式的。如： They deserved to be congratulated. 他们值得祝贺。 She deserved to win because she was the best. 她有资格获胜，因为她是最优秀的。只有当它后面所接动词具有被动意义时才可用动名词，且要用主动形式表示被动意义；此时若改成不定式，则要用被动形式。如：我认为他的文章不值一读。 I don’t think his article deserves reading. =I don’t think his article deserves to be read.

(完整版)英语主动句变被动句试题

1. We often sing this song. _______________________________ 2. He broke his leg in the match. _______________________________ 3. She will sell her house soon. _______________________________ 4. He is repairing the machine. _______________________________ 5. He has finished his work. _______________________________ 6. We call him Lao Wang. _______________________________ 7. We must do something to help her. _______________________________ 8. What did you say at the meeting? _______________________________ 9. He gave me some old magazines. _______________________________ 10. He told me to wait at the gate. _______________________________ 1.we took him to the hopital at once 2.she cleans the room everyday 3.he has bought many books already

主动形式表示被动意义的十二种情况

英语的被动意义除了用及物动词的被动语态形式表示外，还可以用其他方法来表示，就像在汉语中并非一定要用“被”字来表示的被动意义一样。我们把这种用法称之为“主动表被动”，下面笔者就这种可以用主动形式表示被动意义的场合归纳如下。 1．用某些不及物动词表示被动意义，如：carry, cut, drive, iron, keep, lock, open, pick, read, shut, tear, wash, wear, write等等。这类动词既能作及物动词，也能做不及物动词。作不及物动词时，形式上虽为主动，却表示被动意义。例如：Meat cuts easily.肉容易切。 His novel sells well.他的小说畅销。 The car drove easily.这车很容易开。 Your pen writes quite smoothly.你的笔写起来很滑。 2．某些表示感觉动词的动词可以用主动形式表示被动意义。例如： This shirt feels much softer than that one. 这件衬衫比那件衬衫摸起来柔软得多。 That book smells old.那本书有一股霉味。 These oranges taste nice.这些橙子味道很好。 3．有少数动词(bind, cook, do, owe, print)的进行时有时有被动意义。在这种用法中，句子的主语都一般是指物的。例如： The magazine is binding(printing).这本杂志正在装订(印刷)。 He paid all that was owing.欠的钱他都还了。 The meat is cooking.正在火敦肉。 4．动词get, come, go之后接过去分词，表示被动意义。get的这种用法局限于口语和非正式的书面语言，更强调动作的结果而非动作本身，并常用来表示突发性的、出乎意料的偶然事件。而come和go常接含否定意义的过去分词。例如： After working selflessly in here for several years, Mr Li got promoted at last.李先生在此地无私地干了好几年，终于得到提升。 They got delayed because of the holiday traffic. 由于节日交通阻塞，他们被耽误了。 The buttons on my coat came undone.我上衣的扣子松开了。 The woman's complaints went unnoticed.那位女士的投诉无人理睬。 5．在need(want, require, deserve, etc.)doing句型中，动名词(doing)相当于动词不定式的被动式(to be done)，在意思上没有多大差别。例如： The garden needs watering(to be watered).花园需要浇水。 The problem requires studying(to be studied) with great care. 这个问题需要仔细研究。 These jobs want doing(to be done) at once. 这些工作需要马上就做。 6.在bear doing, stand doing, be worth doing结构中习惯上用动名词形式，而不用动词不定式。其中值得注意的是，在be worth doing句型中，只能用动名词的主动式，而在be worthy to be done中，才能用动词不定式的被动式，两者不可混淆。例如： That won't bear thinking of.那是不堪想像的。 The little girl can't stand criticizing.小女孩经不起批评。

英语主动表被动用法归纳

英语主动表被动用法归纳一、谓语动词用主动表被动的五种情形 (1)某些连系动词(如look, sound, smell, feel, taste, prove等)要用主动表被动，因为连系动词为不及物动词，它们没有被动语态形式： That dog looks dangerous. 那只狗看起来很危险。 Your idea sounds a good one. 你的想法听起来很好。 My advice proved to be wrong. 我的意见证实是错的。 (2)当open, close, shut, lock, move等用作不及物动词且表示主语的某种属性时，通常用主动形式表示被动意义： The door won’t shut. 这门关不上。 The supermarket doors shut automatically. 超市的门是自动关的。【注】该用法的不及物动词通常与can’t, won’t 等连用，注意它与用被动语态含义不同：The window won’t shut. 这窗户关不上。(说明主语的属性——窗户有问题了) The window won’t be shut. 这窗户将不用关上。(窗户本身没问题，只是不用关) 有时可能用主动和被动形式均可，只是强调重点稍有不同： Suddenly the door opened. 突然门开了。(不强调动作执行者) The door was suddenly opened. 门突然被打开了。(强调动作执行者) (3)当read, wash, clean, cook, cut, wear, carry等用作不及物动词且表示主语的某种属性时，通常要用主动形式表示被动意义： The cloth washes well. 这种布料好洗。 The book sells quickly. 这书销售得快。 This cheese doesn’t cut easily. It’s too soft. 这乳酪不容易切，太软了。 This shirt will wear very long. 这衬衫可以穿很久。【注】该用法通常与well, easily, slowly, quickly等副词连用，并且在用于以上意思时通常不宜直接使用被动语态形式。不过在某些特殊情况下也可用被动语态，只是含义稍有不同(用主动形式表示主语的属性，用被动形式表示动作执行者所执行的动作)：The sentences read clearly. 这些句子读起来很清楚。(即这句子没有歧义) The sentences are read clearly. 这些句子被读得很清楚。(指读的人读得好) 另外，以上用法有时也可能用于进行时态： The vegetables are cooking. 蔬菜正在煮着。 Is the book selling well? 这书销售情况如何?

主动形式表示被动含义的用法归纳

主动形式表示被动含义的用法归纳主动语态表示被动含义是学习语态的难点，也是高考考查的热点。现归纳如下： [考查热点1] 感官动词常用作系动词(如taste，feel，smell ，sound，look，smell等)，常用主动形式表示被动含义。例如：How sweet the music sounds! The flowers smell sweet． That sounds very reasonable． [考查热点2] 某些动词如cut，drive，pay，write，read，sell，keep，prove，weigh，number，drink，wear，pay，wash，open，cost，lock，last等常用主动形式表被动含义，这时常和well，easily，perfectly，badly，slowly等方式副词连用，这种用法多用来说明主语的特征、性质或所处的状态等。例如： The pen writes quite smoothly． The book sells well. [考查热点3]在too…to结构中常用不定式的主动形式表示被动含义。例如： It's too good a chance to miss． [考查热点4] 有些及物动词如cook，burn，print，prepare等有时会用进行时态表示被动含义。例如： The potatoes are cooking． The dictionary is printing． [考查热点5] 在“need／want／require+V-ing”及“bear／stand+V-ing”结构中用动名词的主动形式表示被动含义，这时相当于不定式的被动式。例如： My car needs／wants／requires repairing．＝My car needs／wants／requires to be repaired． [考查热点6]在There be句型中，something，anything，nothing等不定代词以及名词之后的不定式往往用主动形式表示被动含义。例如： There is nothing to do — I'm bored． There are six letters to write tonight． [考查热点7] be+to blame／to seek等结构具有的特点是作表语的不定式与句子的主语有逻辑上的动宾关系，因而用主动形式表被动含义。例如： A better way is to seek. Nobody is to blame for the accident． [考查热点8] 当不定式所修饰的名词或代词是及物动词的直接宾语，而间接宾语是不定式的逻辑主语时，可以用不定式的主动式代替不定式的被动式。例如：

主动句变被动句

主动句变被动句 John helped Peter. ----- Peter was helped by John. 转换规则 1、主动句变被动句的实质是将主语和宾语的位置对调，动词由原来的形式变为be加上动词的过去分词。如不需要突出动作的执行者，也可不要by-词组。 They punished the criminal. ----- The criminal was punished. 2．如果主动句带有情态助动词或半助动词，在变为被动句时，情态动词或半助动词保持不变，谓语动词由主动变为被动。 They should do the work at once. ----- The work should be done at once. They must have finished their work. ----- Their work must have been finished. He is likely to let you down. ------ You are likely to be let down. 3、如果主句是双宾语结构，变为被动句时刻有两种形式：一种是以间接宾语作主语；另一种是以直接宾语作主语。 They offered him some assistance. ----- He was offered some assistance. ----- Some assistance was offered to him. Father gave me a watch. ----- I was given a watch. ----- A watch was given to me. 4、如果主句的结构带有宾语补足语，变被动的时候要将原来的宾语补语变为主语补语。We have painted the windows white. ----- The windows have been painted white. They elected Tom monitor of the class. ---- Tom was elected monitor of the class. 5、当主动句变为被动句时，有时用by-词组，有时不用。一般来说，当施动者为谁不太清楚、不甚重要或不愿说出时，通常不用by词组。但有时为了强调施动者，则须用by 词组。 Hamlet was written by Shakespeare. Susan was cheated by David. 有时为了避免中途变更主语，不得不用被动句而把施动者置于by-词组中。 He arrived at London where he was met by his friend. Practice 1.They built this house in 1968. 2.People speak English almost all over the world. 3.No one has ever beaten him at once. 4.They use milk for making butter and cheese. 5.They are repairing my piano at the moment. 6. Somebody had cleaned my shoes. 7.He said they were starting a new system. 8.You can’t wash this dress; you must dry-clean it. 9.They will have to adopt a different attitude. 10.People mustn’t leave bicycles in the hall.