Jack?I have good news for you! Rose?What? Jack?The educational department has carried out rules to reduce students' too much study load. Rose?Really? If so, I don’t have to stay up late to do so much homework and my mom may allow me to play computer games. Jack?The best thing I think is that I can have more spare time to take exercise after class. Rose?Sure. By the way, who is your favorite sports star? Jack?Liu Xiang, I should say. Rose?Tell me something about him. Jack?Well, maybe I can show you some photos.

  1. Ability (能力) 能力)
  2. Obligation (义务) 义务)
  3. Certainty (可能性) 可能性)
  4. Permission (允许)
一. We use modal verbs to talk about:
二.We also use modal verbs to:

  5. Make requests(提出请求) (提出请求)
  6. Make suggestions(提出 ( 建议) 建议)
  7. Make offers(提供帮助) (提供帮助)
  8. Give advice(提出意见) (提出意见)

  1.Ability (能力 能力): 能力
Liu Xiang can run the 110m hurdle race within 13 seconds.
  1. can 一般表示与生俱来的能力或 者一种客观可能性,还可以表示请 者一种客观可能性 还可以表示请 求和允许 。
Man can not live without air. Learning English be difficult. can
Can I use your bike?
  2.在疑问句中,用could可表示请 在疑问句中, 在疑问句中 可表示请 语气较委婉。 求,语气较委婉。
He asks if he could smoke here. ? Could have the television on? I can/may ? Yes, you . / No, you afraid not can’t/I’m

  3.表示惊异、怀疑、不相信的态度。(主 表示惊异、怀疑、不相信的态度。(主 表示惊异 。( 要用在否定句、疑问句或惊叹句中) 要用在否定句、疑问句或惊叹句中)
Can this be true?
He’s such a nice person that can’t he commit the crime. How can you be so careless! 你怎么会如此地粗心! 你怎么会如此地粗心!
  4. can never/can’t……too表示 表示 无论怎样…也不过分 也不过分” “无论怎样 也不过分”,“越…越 越 好” 。 You can’t be too careful 你过马路的时候再小心也不为过。 你过马路的时候再小心也不为过。
while crossing the road.
can/be able to区别 区别: 区别
Edison always wondered why hens could hatch (孵) chickens 孵 while he was not able to.
Question: Are the two modal verbs interchangeable (互换 ? If not, why? 互换) 互换
can表示与生俱来的能力或一种客观可能,而 表示与生俱来的能力 一种客观可能, 表示与生俱来的能力或 be able to更加强调通过后天的学习和努力获 更加强调通过后天的学习和努力获 更加强调 得的能力,或者在某个客观的场合和背景下 在某个客观的场合和背景下, 得的能力,或者在某个客观的场合和背景下, 能做到的事情。 能做到的事情。
can/be able to区别 区别: 区别

  1.A big fire broke out in ABC hotel yesterday. Luckily, everyone was able to run out of the building.
  2. She speak both English and French.

  2.Obligation (义务 义务): 义务
I’m so tired! I have to do the training for at least 10 hours a day!
Although Liu Xiang is so gifted in hurdle race… …yet he must work hard to win the gold medal.
ought to/should
have to
Your mother brings you up and takes good care of you, so when she is old, you look after her in return.
A.can B.may C.have to D.must

  3.Certainty (可能性 : 可能性) 可能性
Although the chance of winning a medal is small, I’ll try my best!
Shi Dongpeng might win a medal at the Olympic Games.
very uncertain
might may could (can) should
almost certain
ought to

  1.He be at home. A.may B.might C.must
  2.He be at home, for he
just called me from his home 15 seconds ago.
A.may B.might C.must

  1. must 表示肯定的猜测,译为“一定”, 表示肯定的猜测,译为“一定” 不能用于否定句或疑问句。 不能用于否定句或疑问句。 This must be your pen. He must be doing his homework now. He must have arrived already.

  2. 表示“坚持”(常用于固定句型:if you 表示“坚持” 常用于固定句型: must do sth. 如果你非得要做某事) 如果你非得要做某事)
如果你真的要走,那就悄悄离开。 如果你真的要走,那就悄悄离开。
If you must leave, do it quietly.
?They be doing the experiment in the lab. ?Why? ? ?Because the lights are still burning. A.could C.must B.can D.would

  4.Permission (允许 允许): 允许
May I eat KFC if I win the gold
  1. 表示许可。表示请求、允许时, 表示许可。表示请求、允许时, might比may的语气更委婉一些。 的语气更委婉一些。 比 的语气更委婉一些 ? Might/May I use your computer? ? Yes, you can. /No, you can’t/mustn’t.
  2.用于祈使句中表示祝愿。 用于祈使句中表示祝愿。 用于祈使句中表示祝愿 May you be happy all your life. May you succeed. 祝你成功! 祝你成功!
  3.表示推测、可能(只用于肯定句, 表示推测、可能(只用于肯定句, 表示推测 疑问句则要用can或could)。 疑问句则要用 或 )。 He may be very busy now.

  5.Making requests (提出要求 提出要求): 提出要求
informal will can could
I don’t know how to use this equipment!
Can you help me with my training?

  6.Making suggestions (提出建议 : 提出建议) 提出建议
It’s too hot to take exercise in the afternoon.
Shall we do the training in the morning?
  1.Shall用于第一、第三人称疑问 用于第一、 用于第一 句中, 句中,表示说话人征求对方的意 见、向对方请示或提供帮助 。

  1.Shall we begin our lesson?
  2.When shall he be allowed to leave hospital?
  3.Shall I carry this bag for you?
You shall fail if you don‘t work harder. 警告 He shall be punished according to the rule. 威胁 允诺 He shall have the book 。 等我读完这本书,就会给他的。 等我读完这本书,就会给他的when I finish it.
  2.Shall用于第二、第三人称,表 用于第二、 用于第二 第三人称, 示说话人给对方命令、警告、 示说话人给对方命令、警告、允 诺或威胁。 诺或威胁。

  7.Making offers (提供帮助 提供帮助): 提供帮助
Mom, my dirty clothes have been piled up! I don’t have time……
Don’t worry, dear, I will wash them right away.

  1. 表示请求、建议等,would比 表示请求、建议等, 比 will委婉客气。 委婉客气。 委婉客气 Would you like…
sentence pattern
Would you please… Would you mind… Would rather…

  2.表示意志、愿望和决心。 表示意志、愿望和决心。 表示意志 I will never do that again.

  1).The old man would have a smoke under a big tree every afternoon after he finished his farm work.

  3.可表示经常性、习惯性、倾向 可表示经常性、习惯性、 可表示经常性 翻译为“经常、惯于、 性。翻译为“经常、惯于、总 是”。
The door won’t
  2).门就是打不开 ! open. 门就是打不开
Question: Is this sentence correct? Why?
I will go to the park with you tomorrow if you will offer me lunch. 情态动词
意愿” 表示 “意愿”

  8.Giving advice (提出意见 提出意见): 提出意见
How delicious !!!
You should not/ought not to eat so much before running.

  1.Should表示劝告、建议、命令, 表示劝告、建议、命令, 表示劝告 其同义词是ought to;在疑问句中, 其同义词是 ;在疑问句中, 通常用should代替 代替ought…to。 通常用 代替 。 Should I open the window? We should learn from each 我们应当要相互学习。 我们应当要相互学习。 other.

  2.情态动词 情态动词should用于第一人称 情态动词 用于第一人称 时可以表示说话人的一种谦逊、 时可以表示说话人的一种谦逊、 客气、委婉的语气。 客气、委婉的语气。
Rose?Sure. By the way, who is your idol? Jack?Liu Xiang, I should say. I should advise you not to do that again.

  3. should表示意外或惊讶 常译为 表示意外或惊讶 居然,竟然” “居然,竟然”。 I can’t believe such a gentleman should be so rude to the old. 我不敢相信这样一个绅士居然对老人 如此无礼。 如此无礼。

  4. should 表示猜测时,一般指按经验或逻辑 表示猜测时, 判断,翻译成“照说应该,估计,想必” 判断,翻译成“照说应该,估计,想必”
? When can I come for the photos ? I need them tomorrow afternoon. They be ready by 12 : 00 . A. can B. should C. might D. need

  1)must have done对过去某事的十分肯定猜测 ) 对过去某事的十分肯定猜测 (
  2)may/might have done对过去某事的可能性 ) 对过去某事的可能性 猜测 (
  3)can’t/couldn’t have done对过去某事的否定 ) 对过去某事的否定 猜测 (
  4)should/ought to have done过去应该做而未 ) 过去应该做而未 做 (
  5)shouldn’t/oughtn’t to have done ) 过去不应该做而实际上做了 (
  6)needn’t have done 本没有必要做的事实际 ) 却做了 (
  7)could have done ) 本来能够做的(有能力做) 本来能够做的(有能力做)事实际却未做到
情态动词+have done”的用法 三. “情态动词 情态动词 的用法

  1.With so much work on hand, you to see the game last night. A. mustn’t go B. could have gone C. shouldn’t go D. shouldn’t have gone
  2. There was plenty of time. She . A. mustn’t have hurried B. couldn’t have hurried C. must not hurry D. needn’t have hurried

  3. ?I saw Mary in the library yesterday. --You her. She is still abroad. A. mustn’t see B. can’t have seen C. mustn’t have seen D. couldn’t see
  4. Aunt Marythe train, otherwise she would have arrived here by now. A. must have missed B. should have missed C. had missed D. might miss
可兼做行为动词的情态动词: 四. 可兼做行为动词的情态动词:need 、 dare
情态动词 (+动词原形) 行为动词
  1.无人称和数的变化 无人称和数的变化;
  1.无人称和数的变化 多用于肯定句; 多用于肯定句
  2.尤其用于 尤其用于:
  2.尤其用于: need 否定句及疑问句中; *否定句及疑问句中; (sb.) need to do if/whether之后 之后; *在if/whether之后; dare to do 或与hardly never, hardly, *或与hardly, never, (sth.) need to be no one, nobody连用; one, nobody连用; 连用 done dare

  3.常以needn’t daren’t
  3.常以needn t 和daren t (sth.) need doing 常以needn 的形式出现; 的形式出现;

  4.dare有其过去时dared. 有其过去时dared.
判断正误: 判断正误
He daren’t to speak English before such a crowd, did he? He daren’t speak English before such a crowd, dare he?
These dishes need be cleaned carefully. These dishes need to be cleaned carefully. These dishes need cleaning carefully.
表示否定的情态动词的用法: 五. 表示否定的情态动词的用法 部分情态动词的否定式是情态动词中的考点 之一。 之一。 mustn’t needn’t can’t 不准, 不准 禁止 没必要 ( = don’t have to ) 不能; 不能 不可能
may not 不可以 可能不 不可以; shouldn’t 不应该 ( = ought not to )
How can we deal with exercises concerning modal verbs? Functions & usage of modal verbs Language context (上下文、 上下文、 上下文 语境) 语境
Review the usage of modal verbs and finish the exercise paper



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