初中情态动词讲解

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 can n

2、ot 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 come to

3、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. / yes, pleas

4、e. 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 here. youmust

5、ntplaywithfire,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,dont have to. 如

6、： 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 might / may be in

7、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 is ? 7. must i finis

8、h 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 and actor, he is known

9、 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 / could be_,it must be zhang hans

10、,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 must be_,he is rich but helpful,whose car is

11、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 football might / could be jacks. he likes all kind

12、s 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

13、，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 trousers _ be lilys. because theyre too long. 3.i cant find

14、 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 desk,might/ could,8.my mother _ be at home. she left home w

15、ith 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,cant,用must, could, cant, might填空,1. -excuse me, whose book is this?

16、 - 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 _ be jim. he has gone to hainan. a. may b. mustnt c. cant d. could

17、,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, has gone to b. may not, has been to c. cant， has gone to d. cant, ha

18、s 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mary。,不可能是mary。,mum: who is it ,j: it must be tom,m: it might/could be mar

19、y,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 both play football,whose football is this ,might could must,lili,mark,it_ belong to bush. b

20、ecause_,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 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 tha

21、t ? (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 must be xxs,it could /might be xxs,belong to xxx,belong to xxx,belong to xxx,it is mine/yours/hers/his/ours,i

22、t 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. 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) _ do

23、es 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. (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. i

24、s 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. 作情态动词