英语人教新课标必修五 Unit 3 Life in the future情态动词课件（15张ppt)

1、Revision for Modal Verbs 2情态动词的常考点1.was/were able与could的用法区别2.must与have to的区别3. would 与 used to用法比较4.may must need引导问句的回答5.表示推测的情态动词用法6.表示请求的句式7.dare 和 need 的两种词性的不同用法8.Will的用法9.情态动词+have done用法10.情态动词的特殊用法3The basic uses of Modal Verbs 6、Dare 7、Need 8、ought to 9、三点说明 10、典型错误 1、Can / could 2、May / m

2、ight 3、Must 4、Shall / should 5、will / would 41. Can 表示能力 The parrot can speak three languages.表示请求、允许 Can I borrow the book from the library.表示可能性 Shanghai can be very cold in March.Could 过去式；语气更委婉2. Can 与 be able toCan 表示习惯能力， 而be able to表示经过那里而做成了某事。2. 在否定结构中，二者可以互换。3. can./could + have +p.p1.在否定、

3、疑问句中表示“对过去发生行为 的可能性猜测。2. 在肯定句中表示“本来可以做而未做”The door was lacked. She couldnt have been at home.You could have been more careful.51. May 表示可能性表示允许表示祝愿Might 过去式；语气更委婉2. may/might + have +p.p1.在否定、肯定句中表示对过去动作的推测 “也许是”2. Might+have+p.p表示虚拟，表“劝告、责备之意。”Eg. 1. She may be still waiting for us. 2. May I come i

4、n? 3.May you have a happy holiday.Eg. 1. He might have spoken to her yesterday. 2. You might have told me earlier.61. Must 表示肯定的猜测,但只用于肯定句，而mustnt 表示“禁止、不准”eg:the car is my property;you musnt use it without my permission.3.“偏要，非要不可”eg: If you must go,at least wait until the storm is over.4.表示必须、应该2.

5、 Must 、have to 与have got toMust表示主观Have to表示客观需求Have got to 多见于口语3. must + have +p.p对过去事情的肯定猜测。Eg. The road is wet. It must have rained last night.71、Shall /should 1、第一、三人称疑问句中表示“请求 或征求对方意见。Eg. Shall I get you a cup of coffee?2、第二、三人称陈述句中1、表示说话人的命令，警告、威胁、允诺“会（得到），决心等；用于条约，规定，法令等。eg：You shall be puni

6、shed for what you have done.2、should表示出乎意料的口气，意为竟然，居然Such a gentleman should do that.2、shall/should + have +p.p ought to表示本应该做而未做。should 过去式 语气更委婉Eg. You should have been five minutes ago.8Will/ would 1、表示意愿 Ill try my best to overcome the difficulty.2、表示意图What will you do?3、表示请示、请求，建议 Will you help

7、 me to put these books in order?4、表示习惯动作She will sit for hours without saying a word.Would 与 used to 1、Would 后只能接表示动作的动词。2、used to 则还可以接表示状态的动词。Eg. He used to be a worker.91、情态动词用于否定、疑问句；条件从句中。 eg. 1. Dare you go here alone? 2. How dare you do such follish things? 3. I wont allow you to swim in the

8、river, even if you dare do it. I dare say 我想，大概Dare / dared2 、做实意动词后加不定式。 eg. I have never dared to tell him about it. 10Need /needed 1、情态动词用于否定句，疑问句。2、实意动词用法似dare,用作不定式。3、need + not + have +p.p 表示“本来不需要做而做了。11Ought to 1、其否定式为ought not to2、ought to + have + p.p 表示本来应该做而没有做到。Eg. You ought not to have

9、 cut away the trees around the old building.3.表示义务，意为“应当”，语气比should 强，表示不十分或含蓄地推测，意为“应是，应该”Eg :You ought to work harder than before.12三点说明1、情态动词 + v 表示对现在或将来动作的猜测。 情态动词 + have + p.p表示对过去动作的猜测。2、情态动词的过去式与原形相比，多点礼貌，少点冒昧， 语气更为委婉。情态动词在一般疑问句中的回答： Can you sing? May I come in? Must I handin the book now? N

10、eed I finish it now?Yes, I can.No, I cant.Yes, you may.No, you mustnt.Yes, you must.No, neednt /dont have to.Yes, you must.No, you neednt.13典型错误1. He mustnt be in the classroom. ( )Cant2. You might leave the bag on the bag. ( )might have left3. You must have seen the film last week, havet you? ( )didnt you 4. Li ming must have been to Japan, didnt he