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1、 情态动词的用法Yes,she can.Can she come to the party?Can sheNo,he cant.He has to study.Can he go to the baseball game?Can heCan they come to the party？No ，they cant.They have to study for the math test.Can theyCan you come to my party on Saturday?Sure, Id love to.Sorry, I must study for a math test.Can you
2、 go to the movies tomorrow night?Sure. That sounds great.Im afraid not. I have the flu.Can he go to the party? No, he cant. He has to help his parents.Can she go to the baseball game?No. shes not available. She must go to the doctor.Can they go to the movies?No, theyre not free. They might have to m
3、eet their friends.Grammar Focus情态动词主要有：情态动词主要有：may/might, can/could,must, have to, shall/should, will/would,ought to, need, dare, used to。 Grammar focus现在我们来着重学习情态动词现在我们来着重学习情态动词can 以及以及have to 的用法。的用法。其特征主要有：其特征主要有：1. 不能独立作谓语，只能和动词原形一起构不能独立作谓语，只能和动词原形一起构成谓语，表示说话人的语气和情态。成谓语，表示说话人的语气和情态。2. 没有人称和数的变化。
4、没有人称和数的变化。 (have to除外除外)3. 否定形式：在其之后加否定形式：在其之后加not (have to除外除外)。疑问形式：情态动词提到主语之前疑问形式：情态动词提到主语之前(have to 除外除外)。 can为情态动词为情态动词, 在本单元中表示在本单元中表示请求请求, 用于发出邀请，后跟动词原形用于发出邀请，后跟动词原形。当同意接。当同意接受对方的邀请时受对方的邀请时, 常用常用Sure, Id love to. / Certainly. /Of course.等来回答；若不接受等来回答；若不接受, 常用常用Sorry等来有礼貌地拒绝等来有礼貌地拒绝, 一般情况下一般情况
5、下需要说明不能接受邀请的原因以表示歉意。需要说明不能接受邀请的原因以表示歉意。 Can you come to my birthday party tomorrow？ 明天你来参加我的生日聚会，好吗？明天你来参加我的生日聚会，好吗？ Sorry, I cant. I am going to visit my grandpa. 很抱歉，我来不了，我要去看我爷爷。很抱歉，我来不了，我要去看我爷爷。1. can/may(1)都可表示都可表示“许可许可” 。may用于较正式、客用于较正式、客气的场合，而气的场合，而can比较随便（口语）比较随便（口语）。 You may/can smoke here.
6、 Borrowers may not take out of the library more than two books at a time.The policeman says you cant park here.(2) May/Can I/we? 表示征询对方许可表示征询对方许可。 Can you? 表示请求表示请求。 May I use your phone? Yes, you may./Yes, please. /No, you may not. /No, you mustnt. /No, youd better not. /Im afraid not. /Im sorry. I
7、d rather you didnt. Can I go out and play, Mum? Yes/Certainly, you can. /No, you cant. Can you help me with this bag? With pleasure./Sorry, I cant. Mr. Reed looks pale. He may be ill. (事实上的可能事实上的可能). Mr. Read is in poor health. He can be ill at any time. (逻辑逻辑、理论上的可能、理论上的可能) This news may be true. (
8、=might/could) (事实上的可能事实上的可能) Wang Wei can be really stubborn. (有时或偶然可能会有时或偶然可能会)(=could) (3) 都可表示都可表示“可能性可能性”肯定句肯定句否定句否定句This news may not be true. (也许不也许不, =might not )This news cant be true. (不可能不可能, =couldnt)疑问句疑问句Can this news be true?(=Could)May this news be true? (4) can 还可表示还可表示“能力能力”、“能够能够”
9、You can swim, cant you? No, I cant. I cant promise anything, but Ill do what I can. Tickets can be bought from the Tourist Information Center. 2. might/could (1)分别为分别为may和和can的一般过去时，分别表示的一般过去时，分别表示过去的过去的“许可许可”、“可能可能”和和“能力能力” 、“能够能够”等。等。The children asked whether they could/might go for a swim.(过去许可过
10、去许可) I was afraid it might rain that afternoon. (过去可能过去可能) He asked if the news could be true. (过去可能过去可能)(Can the news be true?) She said he could speak several languages. (过去能力过去能力) I couldnt find her telephone number. (过去能够过去能够) (2) 都可表示现在或将来的都可表示现在或将来的“可能性可能性”。语气。语气没有没有may肯定。肯定。Theres someone at
11、the door. It could/might(=may) be George. (肯定句肯定句) /It couldnt (=cant) be George.(否定句否定句) /Could(=Can) it be George?(疑问句疑问句) According to the radio it could/might/ may rain tomorrow. Lightning could (=can) be dangerous. (3) Might/Could I/we ? Could you ? 表示更委婉表示更委婉、更、更客气的请求。客气的请求。 Might/Could I ask
12、you one more question? Yes, of course you may/might/can/ could. Could you help me with these boxes? Of course I can./With pleasure. 有时在陈述句中也表示更委婉、更客气的有时在陈述句中也表示更委婉、更客气的请求或邀请：请求或邀请：I wonder if I could/might leave now.I dont suppose you could/might.3. can/be able to(1)can= am/is/are able to = shall/wi
13、ll be able to No one can do it. =No one is able to do it. Can you come tonight? =Will you be able to come tonight?(2) could 表示过去的技能表示过去的技能、本能、本能; was/ were able to 表示过去某一具体场合经过努力而表示过去某一具体场合经过努力而做成某事做成某事。 I could swim when I was six. He started late, but he was able to catch the eight oclock train. =
14、but he managed to catch =but he succeeded in catching But: Mr. Smith couldnt/wasnt able to see you because hes got a bad cold.(3) be able to还有完成式和非谓语形式还有完成式和非谓语形式。 Im sorry I havent been able to answer your letter. =Im sorry for not being able to answer your letter. To be able to run is very importa
15、nt for a footballer. 4. have to的意思是的意思是“必须、不得不必须、不得不”, 往往往往 强调由于客观原因而必须做某事。强调由于客观原因而必须做某事。 have to 后接动词原形；后接动词原形；have to有人称、有人称、 数和时态的变化数和时态的变化, 其其第三人称单数形式第三人称单数形式为为 has to, 其其疑问形式和否定形式疑问形式和否定形式要借助于要借助于 助动词助动词do或或does来完成。例如：来完成。例如：We have to look after our sister at home.我们不得不在家照顾我们的妹妹。我们不得不在家照顾我们的妹
16、妹。Does he have to get up early tomorrow morning? 明天早上他必须早起吗？明天早上他必须早起吗？I dont have to stay at home today.今天我不必呆在家里。今天我不必呆在家里。情态动词情态动词“have to”与其他的情态动词与其他的情态动词如如“can”, “may” “must”和和 “should” 不同。不同。1) 这这4个情态动词没有人称的变化个情态动词没有人称的变化, 而而have to有有, 它的第三人称单数它的第三人称单数 为为“has to” 如：如： He should study hard. He
17、has to study hard. 2) 这这4个情态动词在一般疑问句中将它们放个情态动词在一般疑问句中将它们放 在句首在句首, 在否定句中直接在他们后边加在否定句中直接在他们后边加not即可。即可。我们以我们以can为例为例:-Can he go with us? 他能和我们一起去吗？他能和我们一起去吗？-He cant go with us. 他不能和我们一起去。他不能和我们一起去。而而“have to”要加助动词要加助动词do , does或或did才才可能完成其疑问句、否定句。可能完成其疑问句、否定句。5. must/have to (1)must 表示主观表示主观“必须必须”；ha
18、ve to表示客观表示客观客观需要，即客观需要，即“不得不不得不” 。 I dont like this TV set. I must buy a new one. This TV set doesnt work. We have to buy a new one. (now) You must get up at five tomorrow. We (will) have to get up early tomorrow were going to Devon. (future) I had to leave early because I wasnt feeling well. She s
19、aid she must/had to see the manager. (past) 表示邀请的句型表示邀请的句型: (你能来参加我的聚会吗你能来参加我的聚会吗?) Can you come to my party?Could you come to my party?Would you like to come to my party?接受邀请接受邀请:拒绝邀请拒绝邀请:Sure, Id love/like to.Im sorry, I cant. I have to/Im V-ingExercise 一、选择正确的词一、选择正确的词1.Thank you for (ask/ asking
20、), but I cant go to the movies with you.2.Paul has to study (at/ for) the math test tonight.3.My sister has too (much/ many) homework to do.askingformuch4. Can you come to my party (at/ on) Saturday night?5. She invites me (watch/ to watch) the basketball match the day after tomorrow.6. I like playi
21、ng (piano/ the piano).onto watchthe piano二二. 对话填空。每空一词，单词的首字母已给出。对话填空。每空一词，单词的首字母已给出。A: Hey, Xiao Wang, can you go to the m_ on Saturday?B: Im s_, I cant. I have too much h_ this weekend. And Im not f_ _ well today.A: Thats too b_. Whats the matter?ovies orryomeworkad eelingB: Im not sure. Maybe I h
22、ave a c_, as Im feeling a little cold.A: I think youd b_ go to the d_.B: I also t_ so. A: Maybe Im asking you to come another time.B: Sure. T_ for asking.old etter octor hink hanks 三、选择题三、选择题1. Can you play tennis with on Saturday ? A. us B. we C. our D. ours2. Henry his homework this afternoon. A.
23、have to do B. have to doing C. has to do D. has to doing3. Tony is playing tennis the school team. A. on B. in C. to D. with4. Jim play soccer with his friend this weekend, because he is very busy. A. can B. cans C. cannt D. cantACBD5. - ? -Its October the 14th. A. When is today B. whats today C. Wh
24、at time is today D. What day is today6. He is with his father the whole day. A. fish B. fishes C. to fish D. fishingBD7. Can you come to my party? - . A: Sure, I love B: Sure, I love to C: Sure, Id love to D: Sure, Id love.C8. -Would you like to play football with us? -_, but Im busy. A. No, I cant
25、B. No, I wouldnt C. Yes, Im glad D. Yes, Id love to 9. -_I take the newspaper away? -No, you mustnt. You _ read it only here. A. Must; can B. May; can C. Need; must D. Must; must ABIts a Birthday Party Friday,June30,at four hirtyLisas house ,15th StreetCome and have fun!For whom : Time : Place :LisaHomework Write an invitation based on the following information.
