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1、We can use electricity to make many things.We cannot/ cant see electricity.Can you think of an example?Yes, I can./No, I cannot/ cant. We use can and cannot (cant) to say we are able or unable to do something.can/cannot are words to show our abilitiescan be able to 能，能力能，能力 e.g. 我可以唱一首英语歌曲。我可以唱一首英语歌
2、曲。 I can/am able to sing an English song. 过去式：过去式：could e.g. 我十年前就能做到那样。我十年前就能做到那样。 I could do that 10 years ago.否定式：否定式： cannot = cant could not = couldnt Peter can speak English.l否定否定 Peter cant/cannot speak English.l一般疑问句一般疑问句 Can Peter speak English? (一般疑问句，提前情态动词一般疑问句，提前情态动词)l特殊疑问句特殊疑问句 What ca
3、n Peter speak?Hi and Lo are talking about themselves. What are they saying? Read their conversation and then complete the statements below with Can or Cannot.1. Hi _ play football.2. Lo _ paint.3. Hi _ speak as many languages as Lo.4. Both Hi and Lo _ dance.5. Lo _ drive a car, but he _ play chess.6
4、. Hi _ swim, but he _ play the guitar.cancancancancannotcannotcannotcannotMay/Can I use your mobile phone？Yes, you may/can.Sure ./ Certainly. No, you may not/cant.You may/can turn on the TV.You may not/cannot play in the kitchen. We use may and may not to ask for and give permission (许可许可). We also
5、use can and cannot (cant) for the same purpose（目的）.may = can 许可许可 e.g. 你可以睡在这儿。你可以睡在这儿。 You may sleep here. e.g. May I sit here? (更礼貌更礼貌) = Can I sit here?Tell difference: e.g. You can smoke here. (口语口语) = You may smoke here. (礼貌，正式礼貌，正式)否定式：否定式：may not (无缩写无缩写)Daisy is not feeling well today. Benny
6、 is at home with her. Read their conversation below. Fill the blanks with may or can.Benny: How are you feeling, Daisy?Daisy: Not very well.Benny: _ I get you a chair?Daisy: Yes, thanks.Benny: Im going out. _ I borrow your bicycle, Daisy?Daisy: Yes, you may. Before you go to meet your friends, can y
7、ou come and see the doctor with me?Benny: Yes. I _. _ I carry your bag for you?Daisy: Yes, you may. Thats so kind of you, Benny. Im ready to go._ you open the door for me?MayMaycanCanMay We use must and must not (mustnt) to tell people what to do or what not to do.You must not/ mustnt do that，Benny.
8、We must always be careful with electricity. They must not/mustnt play near the heater . After modal verbs such as can,may and must, we use (the base form/ the ing form/the ed form) of a verb.Work out the rule must = have to 必须必须 e.g. You must make a plan before doing any work.否定式：否定式：must not = must
9、nt -Must I stay here? -No, you neednt.Daisy saw a doctor. The doctor told her what to do and what do not do. Help her write down the doctors instructions.drink more water go to bed earlyeat cold food share cups with othersgo out alone take the medicine on time1.I must drink more water.2._3._4.I must
10、 not _5._6._I must go to bed early.I must take the medicine on time.eat cold foodI must not go out aloneI must not share cups with others “肯定推测肯定推测” must +V原原 “一定是一定是”e.g. - What is Tom? - He is wearing school uniform. He must be a student. must can could may might “否定推测否定推测” cant +V原原 “不可能不可能”e.g.
11、- Where is Tom? - He went away with Tom. He cant be in the library. cant couldnt may not might not 拓展拓展 (推测推测, ,“可能可能”) ) He is in the classroom. 100% must 99% (must表推测，用于表推测，用于肯定句肯定句)e.g. He must be in the classroom. 他肯定在他肯定在教教室。室。 may 50% (may表推测，用于表推测，用于肯定句肯定句)e.g. He may be in the classroom. 他有可
12、能在他有可能在教教室。室。 cant / couldnt (can/could表推测，用于表推测，用于否定否定句句)e.g. He cant be in the classroom. 他不可能在教室。他不可能在教室。 must 表示说话人的主观看法表示说话人的主观看法 have to 表示外界客观事实，即表示外界客观事实，即“不得不不得不”。e.g. The head teacher gives us such an important work to do. We must do our best.e.g. The room is dark. I have to turn on the li
13、ght.拓展拓展 （must 与与 have to 的区别）的区别） can 用于一般现在时（用于一般现在时（can） 一般过去时（一般过去时（could） be able to 用于一般现在时（用于一般现在时（am/is/are able to） 一般过去时（一般过去时（was/were able to） 一般将来时一般将来时 （will be able to）拓展拓展 （can与与 be able to 的区别）的区别）用本单元所学的情态动词填空。用本单元所学的情态动词填空。1. Kate, you have won the English competition! Oh, it _ be
14、 true. I made a lot of mistakes in it.2. You _ talk to your grandparents like that. Its impolite.3. We _ wash our hands before meals. It is good for our health.cantmustntmust4. Excuse me, _ you tell me the way to the nearest park?5. You _ go with us to the zoo if you want to.6. I _ speak Chinese ver
15、y well, but I _ speak French at all.couldcan / maycancant1.我会游泳但玛丽不会。 I _ _ but Mary _. 2. 我八点之前必须完成作业。 I _ _ my homework before eight oclock.3. 我可以进来吗，陈老师？_ _ come in, Miss Chen?4. 你不可以在这里打篮球。 You _ _ _ here. Exercise 1: 根据中文意思完成句子。根据中文意思完成句子。can swim cannot must finishMay I mustnt play basketball单
16、项选择。单项选择。( )1. _ you help me with this maths problem? I _ not work it out. A. Can; may B. Must; must C. Can; can D. May; may( )2. The boy _ run very fast. He wants to be a top runner as Liu Xiang in the future.A. canB. cantC. mayD. may notCA( )3. May I go to the cinema, Mum? Certainly. But you _ be
17、back by 11 oclock. A. can B. may C. mustD. need( )4. Must I finish the work before five oclock? No, you _. A. mustntB. neednt C. may not D. cant( )5. You _ talk here. It is against the rules. A. mustnt B. must C. may not D. canCBAExercise 2: 单项选择。单项选择。6. -May I watch TV, Dad? -No, you _. You must fi
18、nish your homework first. A.mustnt B may not C. couldnt D. might not7. -_ you carry the bag by yourself? -Yes, I can. A. MustB. CanC. Should D. May8. You _ throw rubbish everywhere. A. mustntB. cant C. may notD. couldnt Exercise 2: 单项选择。单项选择。9. -_ I borrow these magazines? -Sorry, only the magazines over there can be borrowed. A.NeedB. would C. MustD. May 10. Its the library! So you _ not shout here. A. mustB. canC. should D. may11. Many people like Jay Chou because he _ write and sing popular songs. A. mustB. canC. should D. may