1、那个人有可能是我们老师吗?No, it cant be our teacher. He is on a visit to the Great Wall.不可能。咱们老师正在游览长城呢。【例题】I think Miss Gao must be in the library. She said she would go there.No. She _be there, I have just been there. A.cant B.mustnt C.neednt D.wouldnt【解析】根据下文“我刚去过那儿”可知,应为“不可能”,cant表示推测答案 A2. could的用法:(1).can
2、的过去式,意为“能、会”,表示过去的能力。He could write poems when he was 10. 他十岁时就会写诗。(2). could在疑问句中,表示委婉的语气,此时could没有过去式的意思。如:Could you do me a favour?你能帮我个忙吗?Could I use your pen?我能用一下你的钢笔吗?Yes, you can.可以。(注意回答)3. may的用法:(1).表示请求、许可,比can正式,如:May I borrow your bike?我可以借你的自行车吗?You may go home now.现在你可以回家了。【例题】_ I bo
3、rrow your MP3?Sure . Here you are. A. May B.Should C.Must D. Would【解析】在此处表示请求,意为“做可以吗”。答案:A (2) .表示推测,谈论可能性,意为“可能,或许”,一般用于肯定句中。It may rain tomorrow .明天可能会下雨。She may be at home.她可能在家呢. (3) .may的过去式为might,表示推测时。可能性低于may。He is away from school. He might be sick.他离开学校了,可能是他生病了。 (4) . 表示希望、祈求、祝愿,常可译为“祝愿”
4、。通常是用may +主+V例如:May you have a good time.祝你过得愉快。May you be happy!祝你幸福!May you succeed!祝你成功!4. must的用法:(1).must表示主观看法,意为“必须、一定”。You must stay here until I come back.在我回来之前你必须呆在这儿。Must I hand in my homework right now?我必须现在交作业吗?(2)其否定形式mustnt表示“一定不要” “千万别” “禁止,不许”.如:You mustnt play with fire. 你不许玩火。You
5、 mustnt be late.你一定不要迟到。(3)对must引导的疑问句,肯定回答为must,否定回答为neednt 或dont have to .如:Must I finish my homework?我现在必须完成作业吗?No, you neednt.不,你不必。 (4)must表示有把握的推测,用于肯定句。 The light is on, so he must be at home now.灯亮着,他现在肯定在家。注意其反意问句的构成形式:当must表示肯定的判断、推测时,其反意疑问句要用实际问句的助动词来构成。She must have seen the film before,
6、hasntshe?(注意反意疑问句的后半部分)You must have met uncle Wang in the shop yesterday,didnt you? (注意反意疑问句的后半部分)5. need的用法:(1).need表示需要、必须,主要用于否定句和疑问句中,其否定形式为neednt,意为“没有必要,不必”。用need提问时,肯定回答为must,否定回答为neednt或dont have to。Need I stay here any longer? 我还有必要留在这儿吗?Yes, you must .是的。No. you neednt /dont have to.不,你不必
7、。(2).need还可以作实义动词,此时有人称、数和时态的变化,如果是人作主语后边多接动词不定式。I need to do it right now.我需要马上做这件事。He needs to learn more about the girl.他需要多了解那个女孩。如果是物作主语,一般用need doing与need to be done这种情况下应注意两点:.主动形式的动名词doing具有被动的含义;.该动名词可以改为其动词不定式的被动形式而句子的意义不变。例如:. The door needs painting. = The door needs to be painted.那扇门需要油
8、漆一下。Your car needs mending. = Your car needs to be repaired.你的车需要维修了。6. dare的用法:dare意为“敢、敢于”,用法近似于need,有两种词性:(1)dare作为情态动词,多用于否定句、疑问句或条件句中,无第三人称单数形式,只有一般现在时和一般过去时。Dare he tell them what he knows?他敢告诉他们所知道的情况吗?I darent ask her will you do it for me?我可不敢问她,你能帮我问问吗?(2)dare作为实义动词,此时有人称、数及时态的变化。He doesnt
9、 dare to break his promise.他不敢食言。注意:在口语中,dare的各种形式常与不带to的不定式连用。Do you dare tell her what I said?你敢告诉她我说的话吗?I didnt dare look at him.我不敢看他。7. shall的用法:shall表示征求对方意见(多用于第一、三人称),如:Shall we go out for a walk?我们出去散步好吗?在英语中,我们可以用其他多种方式提出我们的建议或征求对方意见。(1).用“Lets do.”来提出建议。Lets go for a walk after supper.(2)
10、.用“What/How about.?”来提出建议;about后接名词或动词ing形式。What about/How about a drink? What about/How about taking Tom with us?(3).用“Why not.?”来提出建议,表示“何不”not面后接动词原形。“Why not.?”实际上是“Why dont you/we.?”的简略形式。Why not meet at the school gate at eight? Why dont we stay here another day?(4).用“Would you like.?”来提出建议,意思
11、是“你想要吗?”Would you like后可接名词或不定式。Would you like a cup of tea?Would you like to go and see her?因此,如果我们说:“去游泳好吗?”英语中可有这样几种表达法:Shall we go for a swim?Lets go for a swim,shall we?What about/How about going swimming?Why not go for a swim?Would you like to go for a swim?What do you think of going for a swi
12、m?8. should的用法:(1).should意为“应该”,可表示劝告、建议、义务、责任等。We should protect the environment.我们应该保护环境。(2)Should have done表示对过去动作的责备、批评。You should have finished your homework.你应该已经完成作业了。(事实上你没有完成。)9. will的用法:will表示意愿、意志、打算,可用于多种人称。I will help you if Im free this afternoon.今天下午如果我有空,我就会帮你。注意:1、will在there be句型中的形
13、式及其句式变换。由于“一般将来时”的结构可以用“will+动词原形”来表示,所以there be句型的一般将来时的形式就是there will be。(一定不能说there will have)例如:There are many students in our school.There will be many students in our school. There will be a sports meeting next week.一定不能说:There will have a sports meeting next week.2、will与be going to do sth区别:.
14、 be going to表示近期、眼下就要发生的事情,will表示的将来时间则较远一些,如:He is going to write a letter tonight. He will write a book one day. be going to表示根据主观判断将来肯定发生的事情,will表示客观上将来势必发生的事情。He is seriously ill. He is going to die. He will be twenty years old. be going to含有“计划,准备”的意思,而will则没有这个意思,如:She is going to lend us her book.He will be here in half an hour.在有条件从句的主句中,一般不用be going to,而多用will,如:If any beasts comes at you, Ill stay with you and help
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