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1、1Revision for Modal Verbs 2The basic uses of Modal Verbs 6、Dare 7、Need 8、ought to 9、三点说明、三点说明 10、典型错误典型错误 1、Can / could 2、May / might 3、Must 4、Shall / should 5、will / would 31. Can 1.表示能力 The parrot can speak three languages.2.表示允许 Can I borrow the book from the library.3.表示可能性 Shanghai can be very
2、cold in March.Could 过去式;语气更委婉2. Can 与 be able to1.Can 表示习惯能力,表示习惯能力, 而而be able to表示经过那里而做成了某事。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。在否定结构中,二者可以互换。3. can./could + have +p.p1.在否定、疑问句中表示在否定、疑问句中表示“对过去发生行为对过去发生行为 的可能性猜测。的可能性猜测。2. 在肯定句中表示在肯定句中表示“本来可以做而未做本来可以做而未做”1. The door was lacked. She couldnt have been at h
3、ome.2. You could have been more careful.41. May 1.表示可能性2.表示允许3.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在否定、肯定句中表示对过去动作的推测 “也许是也许是”2. Might+have+p.p表示虚拟,表表示虚拟,表“劝告、责备之意。劝告、责备之意。”Eg. 1. She may be still waiting for us. 2. May I come in? 3.May you have a happy holiday.Eg. 1. He m
4、ight have spoken to her yesterday. 2. You might have told me earlier.51. Must 1.表示肯定的猜测表示肯定的猜测,但只用于肯定句,但只用于肯定句,2.而而mustnt 表示表示“禁止、不准禁止、不准”2. Must 、have to 与have got to1.Must表示主观表示主观2.Have to表示客观需求表示客观需求3.Have got to 多见于口语多见于口语3. must + have +p.p对过去事情的肯定猜测。对过去事情的肯定猜测。Eg. The road id wet. It must have
5、 rained last night.61、Shall /should 1、第一、三人称疑问句中表示、第一、三人称疑问句中表示“请求请求 或征求对方意见。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、第二、三人称陈述句中1、表示允诺、表示允诺“会(得到)。会(得到)。2、表示命令、表示命令/警告警告威胁威胁 “该回必须该回必须”2、shall/should + have +p.p ought to表示本应该做而未做。表示本应该做而未做。should 过去式 语气更委婉Eg. You should have been five
6、minutes ago.7Will/ would 1、表示意愿、表示意愿 Ill try my best to overcome the difficulty.2、表示意图、表示意图What will you do?3、表示请示、表示请示 Will you halp me to put these books in order?4、表示习惯动作、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。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。则还可以
7、接表示状态的动词。Eg. He used to be a worker.81、情态动词用于否定、疑问句;条件从句中。、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 river, even if you dare do it.Dare / dared2 、做实意动词后加不定式。、做实意动词后加不定式。 eg. I have never dared to tell him about it. 9
8、Need /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。10Ought to 1、其否定式为、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。表示本来应该做而没有做到。Eg. You ought not to have cut away the trees around the old building.11三点说明三点说明1、情态动词 + v 表示对现在或将来现在或将来动作的猜测。 情态动词 + have + p.p
9、表示对过去过去动作的猜测。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? Need 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.121. 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? ( )hasnt he13