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1、Period Three ,Grammar，Speaking & Writing,语法专题 情态动词may/might,can/could,will/would,shall/should,must/cant,交际导航 口语积累运用,栏目索引,写作专题 如果续写故事,语法精析,语法专题,1.may与might的用法 (1)表示允许、许可。might在语气上比may更委婉。以may/might开头的问句在否定回答中要用mustnt/cant。 May/Might I watch TV after supper? Yes，you may./No，you mustnt/cant. 晚饭后我可以看电视吗
2、？ 是的，可以。/不，不行。,情态动词may/might,can/could,will/would,shall/should,must/cant,(2)表示把握不大的推测，意为“可能”，用于肯定句中。 might语气更加不肯定，指现在或将来，只有在宾语从句中might do (be)才表示过去的可能性。 I think he may come tomorrow. 我认为明天他可能会来。 (3)may用于祈使句，表示祝愿。 May you succeed.祝你成功。,即时跟踪1 选词填空,答案,(1)He looks so pale.He be ill. (2)They be having a
3、meeting，but Im not sure. (3)I wonder whether this story be true.,must,may,can,2.can与could的用法 (1)表示能力(could是过去式)。 Some of us can use the computer now，but we couldnt last year. 我们中一些人现在会用电脑了，但我们去年还不会。 (2)表示猜测，意为“可能”，一般用于疑问句或否定句中(could是过去式)。 Can this news be true？这则消息是真的吗？ (3)表示请求和许可(could表示更委婉的语气，回答时只
4、能用can)。 Can/Could I go now? Yes，you can. 我现在可以走了吗？ 是的，可以。,(4)用于肯定的陈述句中，表示理论上或习惯上的可能性。 Anyone can make mistakes.任何人都可能犯错。 (5)习惯用法“cannot.too.”表示“无论怎样都不过分”，“越越好”。有时cannot可用can never替代。 We cant thank you too much for what youve done for us. 对于你们为我们所做的一切，我们怎么感谢你们都不过分。,考点警示 can与be able to (1)can只有现在式和过去式
5、(could)，而be able to则有更多的时态变化，在将来时、完成时和非谓语动词中只能用be able to。 (2)can一般指自身具有的能力，而be able to则表示经过一段时间的努力后所具有的能力，相当于manage to do或succeed in doing。,(3)在否定结构中was/were able to与could没有区别。 This time I failed in the exam，but Ill be able to pass the exam next time. 这次我考试不及格，但下次考试我能及格。(经过努力) She ran fast but she
6、couldnt/wasnt able to catch the bus. 她跑得很快，可还是没能赶上公共汽车。,即时跟踪2 单句改错,答案,(1)Sarah didnt believe his explanation and cant forgive him. (2)It mustnt be Peter，for he has gone to Beijing. (3)A taxi is forbidden to drive in，so you can be able to get one outside the station. (4)You cant never be too careful
7、to cross the road. 或You cant never be too careful to cross the road.,couldnt,cant,can,will,3.will与would的用法 (1)表示意志、意愿和决心。用于各种人称，will指现在，would指过去。 I will never do that again.我再也不那样做了。 They said that they would help us. 他们说会帮我们。 (2)表示请求、建议。用于第二人称的疑问句中，would表示更委婉的语气。 Will/Would you please take a messag
8、e for me? 你能帮我捎个口信吗？ (3)表示习惯性的动作，意为“总是；习惯于”。will指现在，would指过去。 Fish will die without water.没有水鱼儿就会死。,考点警示 would与used to 两者均表示“过去常常”，但would仅表示过去的习惯性动作(不表状态)，现在有可能还如此，也可能不再那样；used to既表示过去的动作也表示过去的状态，不过现在不再做或不再有那种状态了。 He would take a walk near the forest in the evening. 以前，他晚间常在森林附近散步。 He used to take a
9、 walk near the forest in the evening. 他过去常在晚间到森林附近散步。(而现在已不在那里散步了),(4)用于否定句中，表示“不肯；不乐意”。 No matter what I said，he wouldnt listen to me. 无论我说什么，他就是不肯听我的。,即时跟踪3 选词填空,答案,(1)Each time his mothers birthday came，he buy her a present. (2)He be late for school，but now he is used to getting up early.,would,u
10、sed to,4.shall与should的用法 (1)shall用于第一、第三人称的疑问句中，表示说话人征求对方的意见或向对方请示。 What shall I/we do next? 我(们)下一步该做什么？ When shall my elder brother be able to leave hospital? 我哥哥什么时候可以出院？,(2)shall用于第二、第三人称，表示说话人给对方命令、警告、允诺或威胁。 You shall go with me.(命令)你跟我走。 You shall have a new dress for your birthday. (允诺)你在生日时会
11、得到一件新连衣裙。 He shall be punished.(威胁)他会受到惩罚的。 (3)should表示劝告或建议，意为“应该”，其同义词是ought to；还可表示可能性或表示惊讶、愤怒、失望等特殊情感。 You should go to class right away. 你应该立刻去上课。 Dont ask me.How should I know? 别问我，我怎么会知道？,即时跟踪4 选词填空,答案,(1)Jim is waiting outside. he come in? (2)Little Jim love to be taken to the KTV this eveni
12、ng.,Shall,should,5.must与cant的用法 (1)表示“必须”，语气比should，ought to强烈。其否定形式为mustnt (不准；禁止)。 You mustnt do that，because you must keep your word. 你不能那么做，因为你得遵守诺言。,考点警示,以must开头的一般疑问句的肯定回答中要用must，否定回答中要用neednt/dont have to。 Must I finish the paper today? Yes，you must./No，you neednt/dont have to. 今天我必须完成论文吗？ 是的
13、，你必须。/不，你不必。,(2)表示有把握的肯定推测，只能用在肯定句中，意为“一定；准是”；在否定句、疑问句中要用cant代替。 You have worked hard all day.You must be tired. 你辛苦干了一整天，一定累了。(对现在情况的推测判断) (3)表示感情色彩，意为“偏偏；偏要”，常指令人不快的事情。 The car must break down just when I was about to start. 我正要出发时车偏偏抛锚了。,即时跟踪5 选词填空,答案,(1)Tom，you play with the dog；it may hurt you.
14、 (2)You tell her；I have told her already.,mustnt,dont have to,.用适当的情态动词填空 1.It was really annoying；I get access to the data bank you had recommended.(2016天津) 2.You be Carol.You havent changed a bit after all these years.(2015重庆) 3.You be careful with the camera.It costs! (2015四川) 4.You feel all the
15、training a waste of time，but Im a hundred percent sure later youll be grateful you did it.(2015陕西),答案,高考链接,couldnt,must,must,may,5.Although you find bargains in London，its not generally a cheap place to shop.(2014大纲全国) 6.It was sad to me that they，so poor themselves， bring me food.(2014江苏) 7.I still
16、 remember my happy childhood when my mother take me to Disneyland at weekends.(2014四川) 8.When I was a child，I watch TV whenever I wanted to.(2013江西),答案,can,should,would,could,.单句改错(每小题仅有1处错误) 1.So real friendship should able to stand all sorts of tests.(2014陕西，短文改错) 2.Meanwhile，I found out that with more patience I must make my toys last.(2012新课标全国，短文改错) 3.Mom，though I may often say it，I do love you.(2012四川，短文改错) 4.I have been practising for three weeks now，but I still couldnt get used to itin fact，Ive nearly killed three people.(2010四川，短文改错),
