情态动词主谓一致倒装句专题学习文档格式.docx

1、6）情态动词之间是相互排斥的，即在一个限定动词词组中只能出现一个情态动词，但有时却可以与助动词have和be连用。You should have washed the wound. Well, you shouldnt be reading a novel. 1. can与could 1） can可用于表示能力、可能性、允许等。She can sing that song in English. /Can the news be true? /Can I smoke here?2）（用于否定句、疑问句或感叹句中）表示猜测、怀疑或惊诧。She couldnt / cant be so stupi

2、d to do that . 2） can 只有两种时态，过去式为could。could 不仅用于过去，也可用于现在，表示委婉、客气，常用于疑问句；而be able to 有较多的时态形式。be able to 的过去式表示“设法做某事”，经过努力之后才完成的，而could 没有这个含义。The fire spread through the hotel quickly, but everyone was able to get out. 2.may与 might 1）表示请求、许可、允许、可能性。The librarian told her that she might return the

3、 book to the library in three days. 当回答由may 引起的问题时，否定答语要用must not,表示“不许可”、“不应该”、“不行” 。-May I come in? -Yes, please. /-No, you mustnt. 2）may （might） + have done 表示对过去发生行为的推测，含有“想必”、“也许是”的意 思。He might not have settled the question. 3.must与have to 1）must表示必须、必要。We must protect peoples rights. 2）“must b

4、e + 表语”的结构，通常表示猜测，含有“一定”之意。（只用在肯定句中）例：He must be an honest boy. “must +have +过去分词”的结构，常用在肯定句中，表示对过去发生行为的推测，含有“一定”、“准是”的意思。否定和疑问句用can。It must have rained last night for it is so wet outside. 3）must 的否定式有两个：当回答由must引起的问题时，否定答复要用neednt或dont have to 表示“不必”、“无须”、“用不着”、“不一定”的意义。当表示“不应该”、“不许可”、“禁止”时，就用must

5、 not。Must I go tomorrow? Yes, please./Yes, you must. No, you neednt./No, you dont have to. 4）have to 比较强调客观需要，must着重说明主观看法。I must clean the room.（主观想法） I have to clean the room.（客观需要） have to 能用于更多时态。We had to be there at ten . have to 的否定式dont have to do 表示“不必做”之意。4. ought to与should 1.ought to 1）表示

6、“职责、义务”。Your son is still young. You ought to take care of him. 2）表示推测。注意与must表示推测时的区别：He must be at home by now.断定他已到家） He ought to be home by now.（不十分肯定） This is where the oil must be.（比较直率） This is where the oil ought to be.（比较含蓄） 这时，ought to和should可以互相换用。3）“ought to + have + 过去分词” a. 表示“本应该做，而实际

7、没有做某事”，相当于should + have+过去分词。You ought to have asked him （but you didnt）. b. 表示“本不应该做，而实际做了某事”。You oughtnt to have stopped on the motor way.你本不应该在高速公路上停车的。c.表示推论或推测某事已经发生，含有说话人不能肯定其说法是否争取的含义。If he had started at nine oclock, he ought to have been in London by eleven oclock. 如果她是酒店出发的话，那他十一点中该到达伦敦了。4

8、）ought to 可用于否定句, 疑问句，其否定形式可缩略为oughtnt to。You oughtnt to smoke so much. Ought you to smoke so much?5）ought to的疑问式及其回答。-They ought to do it，oughtnt they？-Yes，they ought（to）. -No，they oughtnt . 在美国英语中，ought to用于否定句和疑问句时，to可以省略。Ought you smoke so much?You oughtnt smoke so much. 2.Should 1）should用于第一人称疑

9、问句中询问对方的意愿，表示说话人的一种谦逊、客气、委婉的语气。What should we do now?2）表示应该、必须，常与must 换用。We should （must） master a foreign language at least. 3）“should+be+表语”的结构，表示推测或惊奇。They should be back by now. 4）“should+have+过去分词”的结构， 表示过去该做而实际上尚未做的动作或行为；其否定则表示发生了不应该发生的行为。其同义结构“ought to have +过去分词”,表示过去“早应该”、“本当”之意，语气较强。I shou

10、ld have thought of that. 这一点我是应当想到的。（但没想到） They should not have left so soon.他们不应当走得这么早。（但已走了） should表示劝告、建议、命令，其同义词是ought to；在疑问句中，通常用should代替ought to。ought to表示“应该”时和should差不多，只是口气稍重一些, 常可互换用。ought to比should具有更强烈得道义、责任、法律或原则等意味；should指主观上感到有责任或义务去做某事，语气较婉转。例:You ought to keep your promise. You sho

11、uld apologize to him. 5. shall 与should 1）shall用于第一人称征求对方的意见。What shall I wear on the journey?2） 用于第二、第三人称时表允诺、命令。You shall come to my office immediately . 3）should用于第一人称疑问句中询问对方的意愿，但语气较委婉温和，例：4）表示应该、必须，常与must 换用。5） should 的其他用法请参阅上条ought to与should 。6. will与would 1）表示意志，决心或愿望。Surely we will support a

12、ll the people in the world in their struggle for peace. If you will go,I shall go with you. 2）will表示经常性、习惯性或倾向性，would表示过去的习惯行为。He will sit there hour after hour looking at the traffic go by. He would come to see me when he was in Beijing. 3）用于主语是第二人称的疑问句中，表示对对方的请求，would的语气比will委婉。Would/Will you kind

13、ly tell me the way to the station?7. need 与dare need 与dare作情态动词用时，一般用在否定句和疑问句中，如果用在肯定句中，多 数是实义动词，一般现在时单数第三人称要加s，并有时态变化，后接不定式时须带to。Need you go so soon?Dare you stay here alone in the night?Need I explain once more? 需要我再解释一次吗？（情态动词） The question needs to be discussed. 这个问题需要加以讨论。（实义动词） She dare not te

14、ll the truth to him. 她不敢向他讲真话。We should dare to think, to speak and to act.我们应该敢想、敢说、敢干。错句：She dares not go out at night. He doesnt need do that. Dare she to go there？8. 注意推测性用法中谓语动词发生的时间 如果推测的为过去的事情，情态动词后要用完成形式。There must have been no one in, for nobody answered the phone. 如果推测的是正在进行的事情，情态动词后则用动词的进

15、行形式。They must be talking about something very secret. 如果推测的是现在的状态等，情态动词后则用动词原形。He must be badly ill. He looks so pale. 如果推测的是将来发生的事情，情态动词后同样用动词原形，这时，情态动词只能是may/might。There may be a terrible storm in the following few days. 肯定的推测一般用may, should,must,它们的意思分别是“可能”，“应该”，“必定”，口气逐渐加强。否定的推测常有两种情况：口气较弱，对否定不大

16、有把握时，用may not “可能不”；口气比较强，对否定比较有把握时用cannot，表示“不可能”。推测的疑问句，一般只用can/could, 例：Who can it be ? / Can it be true?9.其它几个“情态动词+ 动词的完成形式”并不表示推测，注意意义上的区别：could have done本来能够，例：He didnt take part in the competition, he could have won, though. neednt have done 本来没必要，例：You neednt have hurried. There was plenty

17、of time. should/ought to have done 本来应该，例：You should have told me earlier. I could have helped you. shouldnt/oughtnt to have done 本来不应该，例： You shouldnt have been following him so closely; you should have kept your distance. 主谓一致 英语句子中谓语动词的数必须与主语的人称和数取得一致，这就叫做主谓一致。主谓一致主要遵循三个原则：语法一致原则、意义一致原则和就近一致原则。1.

18、either, neither, each, one, the other, another, anybody, anyone, anything, somebody, someone, something, everybody, everyone, everything, nobody, no one, nothing做主语时，谓语动词一般使用单数。Neither of the two words is correct. Everything around us is matter. 2.表示“时间、距离、金额、重量、面积、体积、容积”等概念的名词，谓语用单数。Three times fiv

19、e makes fifteen. Four hours is enough to do the experiment. 3. one and a half后面带名词的复数，但谓语动词必须使用单数。One and a half bananas is left on the table. 4.eachand each; everyand every; noand no; many aand many a等结构 由于强调个体行为，因此谓语动词使用单数。Each boy and each girl has got a seat. No sound and no voice is heard for a

20、 long while. 5.从句、不定式、动名词作主语时谓语动词使用单数形式。To say something is one thing, to do it is another. What he has done is of great use. 6. 用and 连接的两个名词表示单一概念时谓语动词使用单数。The professor and doctor is going to give a lecture. Bread and butter is his usual breakfast. 7.有些名词呈复数形式，但并不表示复数概念。The news is inspiring. The

21、chemical works lies in the north of the city. 8.名词由and 连接或由bothand连接主语时，谓语动词使用复数形式。Both coffee and beer are on sale in that shop. 9. people, public, police, cattle 做主语时，谓语动词习惯上使用复数。People are talking about the news. The police are after a cheat. 10.表示成双、成套的名词做主语时，谓语动词使用复数。His black trousers are too

22、long. These shoes fit you quite well. 但当这些名词由a pair of 连接时，则用单数。There is a pair of compasses in his pencil case. 11.不可数名词作主语，但前面有表示数量的复数名词修饰时，谓语动词用复数。Three million tons of coal were exported that year. 12.在or, eitheror, neithernor, not onlybut also, notbut, There be 等结构中，采取就近原则，即谓语动词使用单数还是复数取决于最靠近该动

23、词的主语的单复数。Either the teacher or the students are to blame. Not only the students but also their teacher is to blame. 13.下列结构用于引起一个附加的成分，谓语动词的形式应不受附加成分的影响而与其前面的主语取得一致：as well as, rather than, like, but, except, besides, with, along with, together with, including，suchas等。The boy with his two dogs is he

24、re. No one but your parents was there then. Mr. Green besides his daughters likes swimming. 14. some of, plenty of, a lot of, lots of, most of, the rest of, all（of）, half（of）, 分数或百分 of名词做主语时，谓语动词的数以名词的单复数为准。A lot of students are waiting outside. Lots of the money has been wasted. More than 70% of th

25、e earths surface is covered by water. 15.由a kind of, this kind of, many kinds of和名词of this kind等以及与kind意思相近的type, sort等构成的短语作主语时，谓语动词与of 前的名词取得一致。This kind of apple is highly priced. Apples of this kind are highly priced. 16.more than 打头的句子，谓语动词的数看其后面的名词。More than one answer is written on the blackb

26、oard. More than two hundred soldiers were killed in the battle. 17.定语从句中谓语动词的形式应与先行词一致，但one of复数名词who/that/which 引导的定语从句的谓语动词的形式要看one 的前面是否有the （only）等修饰语，有则为单数，无为复数。Tom is one of the students who are from Shanghai. Tom is the only one of the students who is from Shanghai. 18. population, company, c

27、lass, team, family, group, nation, world, government等词做主语时，如果强调整体，谓语动词使用单数；如果强调组成成员，谓语动词使用复数。Our football team is playing well. Our football team are having lunch in the dining-hall. 19. “the 形容词”表示一类人，谓语动词使用复数，但在有上下文明确表示单数的情况下必须使用单数。The rich are for the plan, but the poor are against it. 倒装句 1.全部倒装 全部倒装是只将句子中的谓语动词全部置于主语之前。此结构通常只用与一般现在时和一般过去时。常见的结构有：1） here, there, now, then, thus等副词置于句首, 谓语动词常用be, come, go, lie, run。There goes the bell. Here is your letter. 2） 表示运动方向的副词或地点状语置于句首，谓语表示运动的动词。up，down，out， in，away，off 等副词开头的句子里，以表示强调。Down jumped a monkey. Out rushed a