(整理版高中英语)高一英语Unit1Festivalsaroundtheworld(2)人教实验.doc
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1、高一英语Unit 1 Festivals around the world (2) 人教实验版【本讲教育信息】一. 教学内容:Unit 1 Festivals around the world (2)情态动词的用法can / could may / mightwill / would shall / shouldmust/ need二. 重、难点讲解 1. 情态动词的概述1英文中常用的情态动词有:can / could, may / might, shall / should, will / would, must, had better, need等。2情态动词有别于助动词be, have,
2、 do, 情态动词有其自身的词汇意义,而且通常是一词多义。 用来表示可能、建议、愿望、必要、允许、能力、疑心等。3在谓语中的作用:情态动词在句中不能单独作句子的谓语,必须和实义动词一起构成复合谓语。如:I must go to school today.He can dance. He cant swim.2. 情态动词及其根本含义 can, could, be able to may, might must, have to shall, should, ought to need, dare will, would1can / could 表示“能够或表示委婉客气地提出问题或陈述看法表示“
3、能够注意与be able to的差异 a. 表示现在的能力,常用can, 而不用be able to. 如:Bob can play the piano.A fish cant walk, but it can swim.b. could 表示过去“一般的能力,总的能力,即我们在过去想干什么就随时可以干什么。这里也可以用 was / were able to.如:I could / was able to recite several poems when I was 3 years old.而表示主语在过去某个特定的场合所表现出的“特定的能力,具体的能力,或表示某人在某一场合成功地完成了某件
4、事,要用was / were able to.如:With the aid of the wood, he was able to swim across the river.He hurried to the station, and he was able to catch the train.c. 在否认句中, could 和was / were able to 可以互换。如:I applied everywhere and I couldnt get any good job.表示委婉客气地提出问题或陈述看法can = could 常用于一般疑问句,could 比can 更委婉。e.g
5、. Can I see your license?Could I borrow your dictionary?2may / might表示“征求某人意见常用于一般疑问句中,might 比may 更委婉。注意答复的表达方式。 may = mighte.g. May I trouble you with a question?May I smoke here?Yes, please.Please dont.No, you mustnt.-May I use your pen?-Yes, you can.3must 表示“必须“偏偏表示“必须We must do everything step b
6、y step.You mustnt talk like that.表示“偏偏e.g.The car must break down just when we were about to start off.must / have toe.g. You must be back by ten. Otherwise I wont let you come in.You have to be back by ten because well set off at half past ten.注意:must用于表示说话人的“主观愿望,其否认式可用mustnt, neednt 或dont have to
7、have to 用于表示客观事实的要求4shall / shouldshall表示“将要或表示征求某人意见表示“将要I shall be twenty years old next month.If you dont come, you shall be punished.表示征求某人意见Shall we take a walk?Lets take a walk, shall we?should可表示shall的过去式,也可表示“义务、责任“强烈的疑心还可用于名词从句中,表示“意想不到的或lest的后面,表示“以防。如:shall的过去式I told him that I should see
8、 him the next day. 义务、责任You should brush your teeth before you go to bed.You should have called me last night. 强烈的疑心If it should rain, he would not come.用于名词从句中,表示“意想不到的It is surprising that he should be so foolish.It is strange that she shouldnt have been invited. lest的后面,固定用法I get up early lest I
9、should miss the first train. 我起得很早以免错过头班火车。5need / dare既可以用作情态动词,也可以用作及物动词要注意形式上的差异We need not tell him. need是情态动词We dont need to tell him. need是实义动词She dare not say what she thinks. dare是情态动词She doesnt dare to say what she thinks. dare是实义动词She dares to say what she thinks. dare有不同的时态Notesneed doing
10、 = need to be donee.g.The flowers need watering.The flowers need to be watered.6will 表示“意愿、“愿望e.g.Please give my regards to your family. I will.Will you love him forever? I will.would 表示过去习惯性的动作 used toDuring the vacation he would visit me every week.He told us he used to be a soldier when he was yo
11、ung.易用错的情态动词could / would / mightWould you lend me a hand? Of course, here you are.Could I use your dictionary? Yes, you can.Might I use your pen? No, you mustnt.3. 情态动词的特殊用法 情态动词表示“推测 情态动词表示“虚拟1情态动词表示“推测表示“推测的情态动词有:must, shouldcancould maymightThis must be your room.It must have rained last night.T
12、he door was locked. He can could have been at home. I havent seen him for a long time. He might have been arrested by the police. 注意:对现在或将来的推测用情态动词+动词原形的形式,但是对过去事情的推测要用情态动词+have done的形式。must 表示“肯定是,其否认形式是:cant而不是mustnt情态动词表示“虚拟ought to should have done 本来应该做某事实际上没有做ought not to should not have done
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