Unit-2-Healthy-eating-Grammar-情态动词II（学生版

1、B3U2 Grammar 情态动词II (Modal Verbs) 一情态动词ought to的用法 Eg: 1.Ask John. He ought to know.问问约翰吧，他该知道。 2. To keep fit，we ought to learn more about our body. 3. He ought not to do it. / He oughtnt to do it.他不应该做这件事。 4. Ought we to do it at once? 我们应该马上做这件事吗？用法归纳1.表示推测（可能性几近现实）如例句_ ; Dont worry. We _. 我们应该会赢

2、。2.表示义务或责任,如例句_，意为应当；应该(没有人称和数的变化，后接动词原形)He thought that they_ the design. 他认为他们应当参加设计。 3.否定形式为ought to _,如例句_._. 她不应该浪费时间。 4.一般疑问句形式将_提前到主语_。_? 他应该去那里吗？ 练习 1). He _ by now.目前他应该在家了吧。2) You_take care of him 你应该照顾他。3). You _ so much.你不应该吸那么多烟4). _ it at once? 我们应该要立刻做这件事？二.情态动词need的用法Eg: 1.Needhebrin

3、ghislaptoptomorrow?明天他需要带他的笔记本过来吗？2. Youneedntworryaboutitbecauseitsnotyourfault.你不必担心，因为那不是你的错。3.Need I do the cleaning now? Yes， you must. No， you neednt.用法归纳1. need既可作行为动词也可作情态动词。在情态动词时，表示 “需要”“必须”，通常用于_(如例1)或_(如例2)中, 无人称和数的变化。_ this homework first？他需要先做这些作业吗？You_ it again你不需要再做了。2. 用于一般疑问句时，肯定回答

4、一般用_， 否定回答用_._ I hand in my paper now？我现在需要交上论文吗？ Yes，you _. /No，you_. 练习 1. _ it again? 需要他再说一次吗？2. He _ it这件事他无需担心。3. NeedIfinishmyworktoday? No, you _. 三情态动词+have done的用法1情态动词+have done表示：对过去的推测回想：表示推测的情态动词，按照语气强弱依次排列为 _ _ _ _ _ ;1) must +have done的用法 Eg: It must have rained last night, because t

5、he road is wet. 昨天晚上一定是下雨了，因为路还湿着。用法归纳 must +have done用于(肯定句，否定句？)中，表示对过去发生的事情或状态进行肯定的推测，意为“过去一定做过某事”。练习I didnt hear the phone. I_ (be asleep) at that time. 我没听到电话铃响，我那时候一定是睡着了。2) can/could + have done 的用法 Eg : (1) Hecanthavebeen to that town.他根本不可能去过那座城市。 (2) My sister met him in the classroom last

6、 night, so he couldnt have attended your lecture. 我姐姐昨天晚上在图书馆遇见了他，所以他肯定没参加你的演讲(3) Canhehavedonesuch a foolish thing? 他做过这样的傻事吗？(4) I can t find Tom anywhere in the office building. Where could he have gone? 我在办公楼任何地方都找不到汤姆。他有可能去了哪里了呢？用法归纳一般用于_(如例1,2)和_（如例3）中, 在(肯定句，否定句？)中，表示对过去发生的事情或状态的强烈否定的推测，意为“过去

7、不可能做过，肯定没做过”。I saw him in the street, so he _ to the hospital yesterday.昨天他不可能去了医院。在(疑问句，否定句？)中，表示对过去发生的事情或状态的不太有把握的推测，常表示“过去可能做过吗?” _(leave) the work unfinished? It seems that he is not that kind of people. 他会丢下工作不干了？他看起来不像那种人。练习(1)Li Ping _（clean）the room because she has gone to Beijing for a week

8、.不可能是李萍打扫房间的，因为她已经去北京一个星期了。(2) _ tothe library? I find that he has some books.Tom可能是去了图书馆了吗？我发现他手上有几本书。3) may/might + have done 的用法Eg (1) -Whatever has happened to George? 乔治发生了什么事?-I dont know. He may have got lost. 我不知道，他可能迷路了。(2)They may/mightnt have regarded me as their friend.他们可能没有把我当作朋友看待用法归纳

9、表示对已发生的动作或存在的状态进行不肯定的推测， might语气稍弱一点儿，多用于_(如例1)和_(如例2)中，表示“过去可能做过某事或过去可能没做过某事”。练习(1) You _ about it in the papers. 你可能在报上已经看过这个消息了。 (2) He _ (receive) my letter. 他可能没收到我的信。 小结一情态动词对现在和未来的推测对过去情况的推测使用场合mustmust + domust+ have done肯定句can / couldcan / could +_can / could + _can/ could用于_和 _ could 也可用于肯

10、定句may /mightmay /might +_may /might+ _和否定句2. 情态动词+have done表示虚拟语气：责备或后悔1) should/ ought to have过去分词的用法Eg：(1) Tom, you are too lazy. The work should/ought to have been finished yesterday. 汤姆，你太懒惰了，这项工作本来应该昨天就做完的。(2) Look, Tom is crying. I shouldnt/ ought not to have blamed him. 看，汤姆哭了，我本来不应该责备他。用法归纳_

11、表示是“本来应该做某事，而实际没做” _表示 “本来不应该做某事，而实际做了”练习 (1) There was a lot of fun at yesterdays party. You _ come, but why didnt you? A. must have B. should C. need have D. ought to have(2) Oh, I am not feeling well in the stomach, I _ so much fried chicken just now. A. shouldnt eat B. mustnt have eaten C. shoul

12、dnt have eaten D. mustnt eat(3) I was really anxious about you. You _ home without a word. A. mustnt leave B. shouldnt have left C. couldnt have left D. neednt leave 2) need have+过去分词的用法Eg：I neednt have bought so much wineonly five people came. 我本来没有必要买这么多酒，只来了五个人。用法归纳_: 则表示“本来不需要做某事而做了”练习 There was

13、 plenty of time. You _ have hurried. A. wont B. mustnt C. neednt D. couldnt3) could have过去分词的用法Eg: (1) You could have done better, but you didnt try your best.(2) He could have passed the exam, but he was too careless.用法归纳_表示“本来可以做某事，但实际上没有做”练习(1) He paid for a seat, when he _ have entered free. A.

14、could B. would C. must D. need(2) I _ here in time, but I met an old friend of mine. I stopped and talked with him for some time. A. shouldnt have come B. must have come C. neednt have come D. could have come(3) They _ have finished the work yesterday, but it was raining hard.A. must B. could C. sho

15、uld D. might小结二情态动词+have done意义should/ought to+ have doneshouldnt/ought not to+ have doneneednt+ have donecould have done综合练习：一选择最佳的答案1. Mr. White _ at 8:30 for the meeting, but he didnt show up. A. should have arrived B. should arrive C. should have had arrived D. should be arriving2. As you worked

16、 late yesterday, you_ have come this morning. A. may not B. cant C. mustntt D. neednt3Harry _ have won the Physics competition easily yesterday, but he gave up. A. could B. might C. should D. must4. The weather turned out to be fine yesterday. I _ the trouble to carry my umbrella with me. A. should

17、have taken B. could have taken C. neednt have taken D. mustnt have taken5. Why hasnt Jack come back yet? _ anything have happened to him? Im not sure，but I guess something _ happened. A. May；must have B. Can；may have C. Must；may D. Should；might have6. Sir，you _ be sitting in this waiting room. It is

18、 for women and children only. A. oughtnt to B. would not C. wont D. neednt7. The children _ lost in the woods; otherwise, they would have been at the camp as their plan. A. must have got B. must get C. should have got D. should get8. Mary _ the job offered to her, but she didnt. A. cant take B. ough

19、t to have taken C. should take D. must have taken9. I _ use a clock to wake me up because at six oclock each morning the train comes by my house.A. couldnt B. mustnt C. shouldnt D. neednt10.She_have left school, for her bike is still here.A. cant B. wouldnt C. shouldnt D. neednt 二、句子填空 用适当的情态动词与所给动词的适当形式填空。1.Why didnt you come to the party last night. I _ (s