被动语态的构成: 被动语态的基本结构: 主语+be +过去分词(+by+动作的发出者) ① 一般现在时:am/is/are+过去分词 如:Trees are planted every year. ② 现在进行时 am/is/are+ being +过去分词 如:The road is being repaired. ③ 现在完成时 have/has + been +过去分词 如:The work has been finished. ④ 一般过去时 was/were + 过去分词 如:The story was told by him. Many birds were killed last year. ⑤过去进行时 was/were+ being + 过去分词 如: The new house was being painted when I got home. ⑥过去完成时 had +been+ 过去分词 如: He told me that the work had been finished. ⑦一般将来时 will +be + 过去分词 如:The problem will be discussed tomorrow. ⑧ 过去将来时 would/should +be +过去分词 如: He said that the Christmas tree would be put up soon. ⑨情态动词的被动语态 情态动词+ be +过去分词 如:The problem must be solved soon. Children should be taught to love animals.
被动语态使用注意: 1. 不及物动词无被动语态。 如:happen, break down, come out...... What will happen in 100 years. The dinosaurs disappeared about 65 million years ago. 2. 有些动词用主动形式表示被动意义。 如: write, sell, ride..... This pen writes well. This new book sells well. 3. 感官动词或使役动词使用省略to的动词不定式,主动语态中不带“to”,但变为被动语态时,须加上“to”。 例:make somebody do something→somebody+ be +made to do something see somebody do something→somebody +be +seen to do something A girl saw my wallet drop when she passed by.→My wallet was seen to drop by a girl when she passed by. The boss made the little boy do heavy work.→The little boy was made to do heavy work by the boss. 4. 如果是接双宾语的动词改为被动语态时,直接宾语(物)作主语,那么动词后要用介词,这个介词是由与其搭配的动词决定。 He gave me a book.→A book was given to me by him. He showed me a ticket.→A ticket was shown to me by him. My father bought me a new bike. →A new bike was bought for me by my father. 5. 一些动词短语用于被动语态时,动词短语应当看作一个整体,而不能丢掉其中的介词或副词。 We can’t laugh at him. →He can’t be laughed at by us. He listens to the radio every day. →The radio is listened to by him every day. The nurse is taking care of the sick man. →The sick man is being taken care of by the nurse. 构成be+done.
不用于被动语态的情形: ①不及物动词没有被动语态 这类动词有take place, happen, come about, break out, appear, disappear, last, arise等。 例如:A fire broke out during the night. ②某些静态动词不用于被动语态 这类动词有have, lack, fit, hold, suit, resemble等。 例如:My shoes do not fit me. ③宾语为相互代词和反身代词时不用于被动语态 例如:We should help each other.
关于主动形式表示被动意义: ①系动词(如look, sound, smell, feel, taste, prove等)要用主动表被动,因为系动词为不及物动词,它们没有被动语态形式。 例如:The building looks very beautiful. ②当open, close, shut, lock, move, 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,通常用主动形式表示被动意义。 例如:The book sells well. ③有的动词本身含有被动意味,通常用主动形式来表示被动含义。 例如:Her eyes filled with tears. ④不定式to blame, to let用作表语时,通常要用主动表被动。 例如:Who is to blame? ⑤某些“be+形容词+to do”结构中的不定式通常要用主动形式表示被动意义。 例如:The book is difficult to understand. ⑥不定式用于某些动词(如have, have got, get, want, need等)的宾语后作定语时,如果不定式的逻辑主语就是句子的主语,通常用主动形式表示被动意义。 例如:Do you have time to help us? ⑦在too...to do sth.和...enough to do sth. 这两个结构中,若主语与其后不定式为to do sth.被动关系,则该不定式通常用主动形式表示被动意义(有时也可直接用 被动式)。 例如:The writing is too faint to read. ⑧be worth后的动名词要用主动表被动。 例如:This movie is worth seeing. ⑨在need, want, require等少数表示“需要”的动词后的动名词用主动形式表示被动意义。 例如:The house needs cleaning.
表示“据说”的三类被动句型: ①It is said that...句式 例如:It is said that thirteen is an unlucky number. ②There is said that...句式 例如:There is said to be plenty of oil off our coast. ③sb./sth.is said that...句式 例如:Mr. Brown is said to have died of liver cancer.
主语从句: 在复合句中充当主语成分的句子叫做主语从句。常规主语从句,即句子在复合句中充当一个主语。 主语从句的时态:不受主句的时态影响和限制。 例如: That he finished writing the composition in such a short time surprised us all. What we need is time. It is certain that he will win the match. (1) 引导主语从句连词有that,whether,who,what,whatever等 (2) 连词位于句首不能省略 (3) 主语从句大多数情况下视为第三人称单数
主语从句引导词: 1、由连词that引导的主语从句。 例如:That you will win the medal seems unlikely. 你想获得奖牌看起来是不可能的。 That you are so indifferent bothers me. 你如此冷淡使我很烦恼。 That she survived the accident is a miracle. 她在事故中幸免于难简直是奇迹。 2、用连接代词或连接副词if, whether 引导的主语从句。 例如: Which of them escaped from the prison is still a mystery. 他们哪一个是从监狱里逃跑的,仍然是个谜。 When they will come hasn’t been made pubic. 他们什么时候来还不知道。 Whether she is coming or not doesn’t matter too much. 她来不来都无关紧要。 3、用关系代词引导的主语从句。 例如:What you need is more practice. 你所需要的是更多的训练。 What I want to know is this. 我想知道的就是这事。 Whatever we do is to serve the people. 我们无论做什么都是为人民服务。 4、主语从句可以直接放在主语位置上,也可以用it作形式主语,而将从句放在句末(尤其是当谓语较短时)。 例如:That light travels in straight lines is known to all. 光沿直线传播,这是众所周知的事。 =It is known to all that light travels in straight lines. 众所周知光沿直线传播。 When the plane is to take off has not been announced . 飞机何时起飞还没有宣布。 = It has not been announced when the plane is to take off. 还没有宣布飞机何时起飞。 当what引导的主语从句表示“…的东西”时,一般不用it作形式主语。 错:It is a book what he wants. 对:What he wants is a book. 他想要的是本书。 如果带主语从句的句子是疑问式,则必须用it作形式主语的结构。 例如:Has it been settled who will be sent to carry out the task ? 谁将被派去执行这项任务决定了吗 ?
主语从句与宾语从句区别: 主语从句与宾语从句两者的用法和在句中的作用是不同的,下面从它们的各自用法来介绍。 一.主语从句 主语从句 定义:在句子中担当主语的是一个从句,这个从句就叫做主语从句。 主语从句是在复合句中充当主语的从句,通常放在主句谓语动词之前或由形式主语it代替,而本身放在句子末尾。 1. It 作形式主语和it引导强调句的比较 ①主语从句常用it作形式主语,一般常用句型为:It is+{名词/形容词/过去分词}+主语从句例如: It is still a question whether she will come or not. It is strange that you should like him. It is still unknown which team will win the match. 另外,还有一些比较多见的结构: It turned out that……; It has been proved that……; It happened/occurred that……; It is well-known that……等等 ②而强调句则不同,它的结构是:It+be+被强调部分+that+从句 强调主语:It is the times that produce their heroes.时势造英雄 强调宾语:It is English that Prof.Lin teaches us. 强调状语:It was in shanghai that I saw the film. 判断是否是强调句有一个方法,就是将that以后的“句子的其余部分”拿出来单独看,看有没有缺成分,缺的是什么成分,再把谓语动词后面that前面的那部分,带到你认为缺成分的地方,如果放进去是一句完整的句子了,那就说明是强调句。
2. 用it 作形式主语的结构 (1) It is +名词+that从句 It is a fact that … 事实是…… It is an honor that …非常荣幸 It is common knowledge that …是常识 (2) it is +形容词+that从句 It is natural that… 很自然…… It is strange that… 奇怪的是…… (3) it +不及物动词+that从句 It seems that… 似乎…… It happened that… 碰巧…… (4) it is+过去分词+that从句 It is reported that… 据报道…… It has been proved that… 已证实……
3.主语从句不可位于句首的五种情况 (1) if 引导的主语从句不可居于复合句句首。 (2) It is said , (reported) …结构中的主语从句不可提前。例如: It is said that President Jingo will visit our school next week. (3) It happens…, It occurs… 结构中的主语从句不可提前。例如: It occurred to him that he failed in the examination. (4) It doesn’t matter how/whether …结构中的主语从句不可提前。例如: It doesn’t matter whether he is wrong or not. (5) 含主语从句的复合句是疑问句时,主语从句不可提前。例如: Is it likely that it will rain in the evening?
4. What 与that 在引导主语从句时的区别 What 引导主语从句时在从句中充当句子成分,如主语.宾语.表语,而that 则不然。例如: What you said yesterday is right.
2、语序:宾语从句必须是用陈述语句。 如:I think that you must work harder. 宾语从句的引导词、连接词的区别、否定转移等现象。 (1)表达时间的几个句型:一般用when或者是what time: What time will the train leave? 由于时刻都是固定的,也可以用一般现在时代替一般将来时: What time does the train leave? (2)时间的表达方式:8:19(nineteen past eight),7:57(three to eight),在时间的中间也可以加上分的单词(minutes) (3)had better +动词原型。意思是提要求,建议。但是上下级不能用这种方式,因为语气太重: You had better give up smoking . (4)sb leave sth +地点 I left my book in my classroom yesterday. (5)may I have your name(address\age)?一般询问对方的年龄、名字等,不要习惯以前的问法,这样很不礼貌,而是要采访上面的问法。 以前的习惯是:how old are you? \what's your name? (6)修饰名词的代词次序:限-描-大-形---年---颜----籍----物--------类+名词: this is a bridge. This is a beautiful bridge 补充:从句的语序永远是陈述句。
主语从句结构: 1、It is +名词+从句 It is a fact that… 事实是…… It is good news that … ……是好消息 It is a question that … ……是个问题 It is common knowledge that … ……是常识 类似的名词还有:a pity;a wonder;a good thing; no wonder; surprise等。 例如:It is a mystery to me how it all happened. 这一切是怎么发生的是个谜。 It is common knowledge that the whale is not a fish. 鲸鱼不是鱼,这是常识。 It is no surprise that Bob should have won the game. 鲍勃会赢得这场比赛,这不足为奇。
2、It is +形容词+从句 It is necessary that … 有必要…… It is clear that … 很清楚…… It is likely that … 很可能…… It is important that … 重要的是…… 类似的形容词还有: strange; natural; obvious; true; good; wonderful; possible; unlikely; quite; unusual; certain; evident; worth-while; surprising; interesting; astonishing, etc. 例如:It is obvious that conductors and insulators are both important in industry. 很明显导体和绝缘体在工业中都很重要。 It is doubtful whether she will be able to come. 她是否能来令人怀疑。 It was really astonishing that he refused to talk to you . 他拒绝和你说话真是令人惊讶。 It is essential that he should be here by the weekend . 周末之前,他应该到这里是必要的。 It seems obvious that we can not go on like this. 很明显我们不能这样下去了。
3、It is +过去分词+从句 It is said that … 据说…… It is reported that … 据报道…… It has been proved that … 已证明…… It must be proved that… 必须指出…… 类似的过去分词还有:known; estimated; expected; believed; thought; hoped; noted; discussed; required; decided; suggested; demanded; made clear; found out,etc. 例如:It is thought that he is the best player. 大家都认为他是最好的选手。 It is estimated that the vase is 2000 years old. 据估计这个花瓶有2000年的历史。 It is used to be thought that a new star must be due to a collision between two stars. 过去一直认为新星是由于两颗星星之间碰撞产生的。 It has not been made clear when the new road is to be opened to traffic. 还没弄清楚这条路将开始通车。
4、It +不及物动词+从句 It seems that … 好像是…… It happened that… 碰巧…… It follows that … 由此可见…… It has turned out that … 结果是…… 类似的不及物动词还有:seem, appear, occur, follow, happen, turn out, etc. 例如:It turned out that nobody remembered the address. 结果是无人记得那个地址。 It now appears that they are in urgent need of help. 看起来他们急需帮助。 It does not matter if I missed my train, because there is another later. 没有赶上这趟火车没有关系,稍晚还有一趟。 It happened that I saw him yesterday. 碰巧我昨天看见他了。 当“及物动词 + 宾语”较短时,也可用这种结构。 例如:It shocked me that Peter did not tell anybody where he was. 让我吃惊的是彼得没有告诉任何人他在哪里。 It does not interest me whether you go or not. 我对你去不去不感兴趣。 It +某些固定结构+ 主语从句。 例如:It doesn’t make too much difference (It doesn’t make any difference / It doesn’t alter the situation),whether it rains or not . 下不下雨都没有多大关系。 It does not make any difference whether it rains or not . 下不下雨没什么分别。 It does not make the least difference to me what you do. 对我来说你做什么都无关紧要。 Is it of much consequence to you that Mr. Wang has failed to do it ? 王先生没有做成这件事对你有什么重要影响吗?