教育_教案_课件

中教网 >> 教学案例 >> 英语教案 >> 中学英语教案 >> 高中英语教案 >> 高一英语教案 >> Unit 25 At the conference

Unit 25 At the conference

2005年1月13日 来源:网友提供 作者:未知 字体:[ ]

  ②There must be some reason for him to be late again.想必有某种理由他才又迟到了。

语法---情态动词表示推测用法

  用法:

  1)must表示我们对某事很有把握,从逻辑上看是必然的,它只能用于肯定的陈述句中。在疑问句和否定句中,通常用can和can’t。

  ①John said the professor must be at least seventy, but Peter thought he couldn't be as old as that.约翰说那位教授至少有70岁,但彼得认为他不可能有那样老。

  ②He can't have been to your home. He doesn't know your address.他肯定没去过你家,他还不知道你的地址呢。

  2)can和may表示推测时,语气较弱。在肯定句中,can常用来表示客观的逻辑上的可能性;而may表示事实上的可能性。如:

  ①Anyone can make mistakes.人人都会犯错误。

  ②He looks pale. He may be ill.他脸色苍白,可能病了。

在疑问句中,通常用can,不用may

  -Can they have missed the bus? -Yes, they may have.

  “他们会错过公共汽车吗?”“是的,也许会。”

  3)can和may都可用于否定句,但含义不同。

  can not表示“不可能”;may not表示“可能不”。

  ①She may not tell lies.她也许没有说谎。

  ②He can’t be her father; he is too young. 他不可能是她的父亲,他太年轻了。

例题:

  Michael________ be a policeman, for he’s much too short.

  A. needn’t    B. can’t    C. may    D. mustn’t

分析

  needn’t表示“不必”;mustn’t常用来表示禁止,不允许;may表示一种可能性;can’t 则用来表示否定意义的推测,意为“不可能”,它是一种非常有把握的推测。正确答案为B项。

  Sorry I’m late. I_______ have turned off the alarm clock and gone back to sleep again.

  A. might     B. should     C. can     D. will

分析

  说话者在找自己迟到的原因,并对过去的原因进行推测。can不用于表示肯定的推测。should have done表示“本应该做某事,但未做”,不合句意。所以答案为A项。

练习:

  1. —The light is still on. Mrs Li ______ be in the office.

  —She ______ be there because I saw her go home just now.

  A. must, may  B. may, mustn't   C. must, can't   D. can, may not

  2. At present too many trees ______ still ______ cut down.

  A. is, being   B. are, to be    C. are, being   D. is. be

  3. There must be ______ for his being late.

  A. some reasons   B. some excuse  C. some reason  D. some results

  4. The baby is sleeping. You ______ make any noise.

  A. can't  B. needn't  C. mustn't  D. don't have to

答案:1. C  2. C  3. C  4. C

 

 

Lesson 97 教学设计方案

Teaching Aims

  1. Get to know how to make a telephone call.

  2. Study the language points concerned with the dialogue.

  3.Learn the dialogue by listening and act it out.

Teaching procedures

Step 1 Listening

Listen to the tape and then ask them some questions:

  1. What do Mary and Lizzy have to do?

  2. How many people are coming to the conference?

  3. Why do they need the buses? Let's go on listening to the second part of the dialogue and see what happens when Mary rings the Bus Company.

本文章共5页,当前在第4页  1  2  3  4  5  


关闭】【收藏本文到IE】【中教论坛】【返回首页