初中情态动词讲解.ppt

1、Learning goals:,复习部分情态动词的用法,1,2,情态动词的新用法情态动词表示推测,3,对物品的归属进行猜测,思考？,你记得学过哪些主要的情态动词吗？,1,2,情态动词有哪些语法特征呢？,can. could, may, must，might, have to,3,情态动词如何使用呢？,1. 情态动词有具体的词义。 2. 情态动词没有人称和数的变化。 3. 情态动词后必须跟动词原形，两者 一起构成谓语动词。 4. 一般疑问句提前边， 否定句在后直接加 not.,can / can not,1. 表示能力 (会) 1) Mary can speak English, but she

2、 can not speak French. 2) Can you lift this heavy box? 3) Can you skate? 2. 表示允许 (可以) 1）Can I use your dictionary? 2）- Can I go home now? - Yes, you can. / No, you cant.,1. 是can 的过去式；表示过去的能力； He could ride a bike at the age of five. 2. 用于婉转语气,多用于问句。“能，可以” Could you please clean the room? - Could I c

3、ome to see you tomorrow? - Yes, you can. ( No, you cant. ) 此处 could 不是过去式，只是语气更委婉， 答语中不能用could和 couldnt，要用can 和 cant。,could,may / may not,1. 表示请求和允许 (可以), 比can正式. May I come in? Hemaycomeifhelikes.,may的用法:,may / may not,may的一般疑问句，其否定回答用 cant 或 mustnt。 1. -May I go home now? -Yes, you may. / Sure. /

4、Yes, please. No, you cant./ mustnt. 2. -May I use your washroom now? -No, you _. Theres something wrong with the toilet. A. neednt B. mustnt C. shouldnt D. didnt,B,must / must not,must 必须 ,表示说话人的 主观意志。 You must do your homework first.,must 的用法:,must / must not,mustnt 表示禁止 ，不准，不允许。 You mustnt smoke h

5、ere. Youmustntplaywithfire.,must not的用法:,must / must not,以must开头的疑问句， 肯定回答：Yes , must. 否定回答: No, neednt. 或 No, dont have to. - Must I clean the classroom now? - Yes, you_ . - No, you _ . / No, you _ .,must,neednt,dont have to,need作情态动词，主要用于疑问句和否定句中 need 一般疑问句: 肯定回答用 Yes, must， 否定回答用 No,neednt . 或 No

6、,dont have to. 如： Need I do it now? Yes, you _。 No, you _ . need 作行为动词，有人称、数和时态的 变化后接to do， 即 need to do sth.,need,must,neednt / dont have to,might / may,might 1. 是 may 的过去式。 2. 表示推测, 可能性较小。 1) Hemightbeverybusynow. 2) Yourmother mightknowthetruth. may 也表示猜测，意为“可能”。 3) Where is my English book? It m

7、ight / may be in your desk.,.用适当的情态动词填空： 1. I can play football. _you swim? 2. I cant play with you. I _finish my homework first. 3. I_ get up early tomorrow. because I have a meeting. 4. Nobody _live without air.,Can,must,must,can,5._I come in ?Yes ,please. 6. _you please tell me where the station

8、is ? 7. Must I finish the work now ? No, you _. 8. -Need I take this book out? -Yes , you _ . A. can B. may C. need D. must 9. _ the girl read before she went to school? A. Can B. Must C. Can D. Could,May,Could,neednt,D,D,情态动词表示推测,Guessing game,Whose dog is this?,It might/ could be_.,He is a singer

9、and actor, he is known by everyone.,Whose dog is this?,It must be Liu Dehuas.,It might/ could be_.,He is a singer and actor, he is known by everyone.,An actor, he is tall, cool and popular.,Whose dog is this?,It might / could be_.,An actor, he is tall, cool and popular.,Whose dog is this?,It might /

10、 could be_.,It must be Zhang Hans.,He is a basketball player.,Whose car is this?,It might / could be _.,He is a basketball player.,Whose car is this?,It might / could be _. It must be_. It cant be _.,mine,Yao Mings,He is rich but helpful.,Whose car is this?,It might/ could be _. It cant be _. It mus

11、t be_.,He is rich but helpful.,Whose car is this?,It might/ could be _. It cant be _. I must be _.,mine,Bill Gates,情态动词表推测讲解,must 表示推测,must 表示非常肯定的或有把握的推测， 意为“一定，必定”。 只用在肯定句中，不能用于否定句中。,Eg. You have worked hard all day. You must be tired.,might, could 表示推测,语气更委婉，表示的可能性较小，说话中留有余地，意为“可能，也许，或许”。,1. The

12、football might / could be Jacks. He likes all kinds of ball games. 2. Liu Mei isnt here today. She might / could be ill.,cant 意为“不可能”, 必用在否定句中。 - The man cant be Mr. Green. - He has gone to America.,Groupwork,情态动词must, might, could, cant 表示推测的含义与用法。 情态动词must, might, could, cant 后面都接动词原形，都可以表示对现在情况的揣

13、测或推断，但他们的含义有所不同：,must 一定，肯定（100%的可能性）,might, could 有可能，也许（20%80%的可能性）,cant 不可能，不会（可能性几乎为零）,活动探究,情态动词表示推测 常考的有：,对某事判断的程度： must could might cant,must, could, might, cant,练练吧,Choose must , might, could, cant , can to fill in the blanks.,1.The storybook_ be hers. It has her name on it. 2.The beautiful t

14、rousers _ be Lilys. Because theyre too long. 3.I cant find my key. It_ be left at home. 4.The volleyball_ be Sallys or Anns. They both like playing volleyball. 5.The piano_ belong to Alice. She often plays the piano.,must,cant,could/might,might/could,might/could,7.The pen_ belong to him. Its on his

15、desk.,might/ could,8.My mother _ be at home. She left home with me. She has gone to go to work.,cant,9.This basketball _ be Nings. He plays basketball every day.,could/ might,10.This school uniform _ be Nicks. Its too small for him.,cant,6. _that wallet yours? -No, it _be mine. Mine is here.,Can,can

16、t,用must, could, cant, might填空。,1. -Excuse me, whose book is this? - It _ be Johns. It has his name on it. 2.The man _ be my English teacher. He has gone to Canada. 3. It _ be Jims football. He likes playing football very much.,must,cant,might /could,【例1】 - Jim is reading a book under that tree. - It

17、 _ be Jim. He has gone to Hainan. A. may B. mustnt C. cant D. could,C,典型例题解析,【例2】 - Where are you going this month? - We _ go to Xiamen, but were not sure. A. neednt B. must C. might D. mustnt,C,典型例题解析,【例3】 Wheres Mr Li? I have something important to tell him. You _ find him. He _ Japan. A. may not,

18、 has gone to B. may not, has been to C. cant， has gone to D. cant, has been to,C,典型例题解析,【例4】 Could I look at your pictures? Yes, of course you _. A. could B. can C. will D. might,B,典型例题解析,【例5】Where is Jack，please? He_be in the classroom.2013 杭州 A. can B. need C. would D. must,D,典型例题解析,学习物品的归属,(可能是Ma

19、ry。),(不可能是Mary。),Mum: Who is it ?,J: It must be Tom.,M: It might/could be Mary.,J: It cant be Mary. She is in China.,(一定是Tom。),(可能是Kate。),(绝对不是Marry。),Mum: Who is it? Jim: (一定是Tom。),It must be Tom.,It might/ could be Kate.,It cant be Marry. She is in China.,-It_ belong to Mark or Lili Because they b

20、oth play football.,-Whose football is this ?,might could must,Lili,Mark,-It_ belong to Bush. Because_,Bush,-Whose red bicycle is this ?,cant,his bike is white and blue.,Can this T-shirt be Jims?,It cant be Jims.,Because its too small for him.,Jim,Liu xiang,-It_ be Liu Xiangs.,-Whose exercise book is

21、 this ?,must,It must belong to Liu Xiang,Because it has his name on it.,语言点：whose 谁的,1.Whose truck is that ? (同义句) _ is that _ ? 2. I think that is my fathers shirt. （就划线部分提问） _ shirt do you think _ _ ? 3. By _ the car was invented?,Whose,that is,Whose,truck,whom,Whose is this ?,It cant be xxs.,It m

22、ust be xxs.,It could /might be xxs.,belong to xxx.,belong to xxx.,belong to xxx.,It is mine/yours/hers/his/ours.,= It belongs to me/you/her/him/us.,Its Li Pings.,= It belongs to Li Ping.,belong to sb (名词/代词的宾格) = be sbs (名词所有格/ 名词性物主代词),belong to 属于,1. 不能用于进行时态 2. 不能用于被动语态 3. belong to +名词或代词的宾格。 4.

23、 常与名词性物主代词或名词所有格进行 句型转换, 即： belong to + sb. / 代词宾格 = be + sbs / 名词性物主代词。,1. Who is the owner of the black box? (同义句转换) _ does the black box _ _ ? 2. Would you like to have a _ (野餐) with us this weekend?,课时训练,Who/Whom,belong to,picnic,3. This bike is Lucys. (同义句) This bike _ Lucy. 4. It must be hers.

24、 (变否定句) It _ _ hers. 5. -Whose storybook is this? - It _ Jack. I saw him reading just now. A. must be B. must belong to C. is D. be belong to,belongs to,cant be,B,小结：情态动词归纳,can : 1. 表示能力，“能，会” 2. 表示允许，“可以”， Can I ? 较口语化。 3. 表示推测。 cant 只用于否定句中。,could : 1. 是can 的过去式，表示过去的能力。 2. could表示更为委婉的语气。 3. 表示猜测，“很可能”,may: 1. 表示许可，“可以”。 2. 以may引导的一般疑问句的否定回答cant / mustnt 用。 3. 表示推测，用于肯定句中。,might : 1. 是may的过去式。 2. 表示猜测，可能性比could小。,must ： 1. 表示说话人的主观意志，“必须”。 2. mustnt 表示“禁止，不允许”。 3. must引导的疑问句，否定回答用neednt / dont have to. 4.must 表示猜测，”一定“，只用于肯定句中。,need: 1.