必修3Unit1情态动词改

1、情态动词情态动词( (一）一）modal verbmodal verb情态动词表说话人的某种感情情态动词表说话人的某种感情或语气，对某一动作或状态的或语气，对某一动作或状态的某种态度。表示某种态度。表示“需要、可以、需要、可以、必须、应当必须、应当”等。等。 情态动词情态动词 ( modal verbs)情态动词有一定的意义，但没有人称和数的情态动词有一定的意义，但没有人称和数的变化，不能独立使用，它和后面的动词构成变化，不能独立使用，它和后面的动词构成谓语谓语只作情态动词的只作情态动词的can/could, may/might, ought to， must可情态可实义的可情态可实义的nee

2、d, dare可情态可助动词的可情态可助动词的shall/should, will/would相当于情态动词的相当于情态动词的have to, used to1) Some of us can use the computer now, but we couldnt last year.2) The new-built theatre can seat 1500 people.3) Can she be in the computer center?4) I thought what he said could not be true.5) Can/Could I use your dicti

3、onary?6) Could you lend me a hand?1. 1.表能力表能力3. 表示表示“请求请求” “允许允许”(表请求时，口语中常用表请求时，口语中常用 could 代替代替 can 使语气更委婉，回答时用使语气更委婉，回答时用can)2. 表示推测表示推测 “可能可能”，can只用于疑否句，只用于疑否句，could不限不限1. can 与与could4. 表示表示“许可许可”，可与，可与may 换用。换用。You can go home now.5. can 用于疑问句或否定句中时，表惊异、用于疑问句或否定句中时，表惊异、不相信等，意思是不相信等，意思是“可能、能够可能、

4、能够”。How can you say that you really understand the wholestory if you have covered only part of the article?How can you be so selfish?6. can 用于陈述句，表用于陈述句，表“有时会有时会”“”“有些会有些会”。Boys can be beautiful and girls can be very naughty.Shanghai can be very cold in March.2. may 与与might1. 表示表示“许可许可”或或“请求请求”，有，有“

5、可以可以”的意思，口语中的意思，口语中 常用常用 might 代代 may ,表示委婉语气。表示委婉语气。 否定回答时用否定回答时用“must not”表表“禁止，阻止禁止，阻止”.Eg: - May I watch TV after supper? - Yes, you may. / No, you mustnt. 2. 表示可能性。表示可能性。 意为意为“或许，可能或许，可能” might 比比 may 可能性小。对现在或将来猜测。可能性小。对现在或将来猜测。Eg: 1) It might be true. 2) They may be in the library now.3) They

6、 may come here tomorrow. may/ might as well + 动词原形动词原形 “还是还是的好的好”， “不妨不妨” Eg: You may as well go and have a look.4. May you +动词原形动词原形 表表“希望、祝愿、祈求希望、祝愿、祈求” “祝你祝你”Eg: May you succeed.Make 2 sentences by yourselves with “may you”.3. must1. 表示义务或强烈的劝告，意为表示义务或强烈的劝告，意为“必须必须”“”“应该应该”， 其其否定式否定式表示表示“不应该不应该”“

7、”“不许可不许可” “不准不准”“”“禁止禁止”。Eg: 1) You must finish your homework first. 2) Children mustnt speak like that to their parents.2. 回答回答 must 所在的一般疑问句时，否定回答用所在的一般疑问句时，否定回答用 “neednt” “dont have to”.Eg: -Must we finish the work tomorrow? -No, you neednt/ dont have to, but you must finish it in three days.3. 对

8、对现在现在进行推测，用于进行推测，用于肯定句，意为肯定句，意为“一定一定”“”“务必务必”。Eg: 1) Betty must be in the next room. 2) He must be watering the flowers in his garden. 4. 表不满或指责，用于肯定句或疑问句，意为表不满或指责，用于肯定句或疑问句，意为“非非得得”“”“必定会必定会”。1) If you must smoke, please go outside.2) My car must break down whenever Im in a hurry.3) Must you spit o

9、n the floor? The toilet is so near!陷阱提示must: 1. mustnt只表示只表示“不可以，不许不可以，不许”； 不不表示表示猜测猜测“一定不会一定不会”！(cant) 2. must 只对只对现在现在表猜测表猜测，不，不对对将来将来猜测！猜测！can 表表猜测猜测只用于只用于疑问句否定句中！疑问句否定句中！ 用于用于陈述句陈述句表示的是：表示的是：有时会！有时会！may/might 1. 表表猜测猜测既可用于既可用于肯定句，肯定句， 也可用于也可用于否定句；否定句； 2. 可对可对将来将来猜测猜测真题演练真题演练1.-I dont really like

10、 James. Why did you invite him? -Dont worry. He _come. He said he wasnt certain what his plans were.(11北京）北京） A. must not B. need not C. would not D. might notD2. It _ be the postman at the door. Its only six oclock. (2011江西卷）江西卷） A. mustnt B. cant C. wont D. needntB3. It is usually warm in my homet

11、own in March, but it _ be rather cold sometimes.(08福建）福建） A. must B. can C. should D. would B3. I have told you the truth. _ I keep repeating it? （10江西）江西） A. Must B. Can C. May D. Will A3. will 与与would 1. 表表“请求、建议请求、建议”等，用等，用 would 比用比用will 委婉，客气些委婉，客气些Eg: 1)Will you lend me your book? 2) Would you

12、 like a cup of tea?2. 用于表示意志或意愿。用于表示意志或意愿。 will 指现在，指现在， 而而 would 指指 过去。过去。Eg: 1) Ill never do that again. 2) They said that they would help us.wont 表示表示“不肯、不乐意不肯、不乐意”Eg: No matter what I said, he wont listen to me.3.表示习惯性动作。表示习惯性动作。 译作译作 “总是、惯于总是、惯于” will 指现在，指现在， would 指过去。指过去。Eg: 1)He will often

13、read all night. 2) Every evening, she would sit by window, deep in thought.4. 表示功能，译作表示功能，译作“能、行能、行”Eg: 1) That will be all right. 2) This door wont open.4. should1. 用于表劝告、建议。用于表劝告、建议。 意为意为”应该、应当应该、应当”。Eg: You should keep your promise.2. 用于表推测。用于表推测。 意为意为 “可能、该可能、该”Eg: 1) Its 7 oclock. He should be

14、at home. 2) Its 7 oclock. He should be here at any time.联想：联想：suggest, order, require/request, insistmust & should1) The light is on. He _ be at home.2) It is 10 oclock. Mr. King _ be at the office.mustshould总结： must & should:1.推测的情境不同：should表示按常理推测；2.推测的时间不同。1. Youre using Iphone 5s! You _

15、have a lot of money!2. When can you finish your design? It _ (be) ready before you need it.mustshould be5. shall 与与will1. shall 用与第一人称连用，用在疑问句中时，用与第一人称连用，用在疑问句中时， 表说话人主动提出做事，并征求听话者的允诺。表说话人主动提出做事，并征求听话者的允诺。 shall 与第三人称连用，询问对方的意见；与第三人称连用，询问对方的意见； will 与第二人称连用，请求对方做事。与第二人称连用，请求对方做事。 would 更客气。更客气。Eg: 1

16、) Shall we begin our discussion? 2) Do you feel hot? Shall I turn on the AC? 3) Shall the driver wait? 4) Will you speak louder, please?2. shall的主语是第二、三人称的陈述句，表示说话人的主语是第二、三人称的陈述句，表示说话人 的允诺、警告、命令等语气。的允诺、警告、命令等语气。 Eg: 1)You shall get the book tomorrow. 2) He shall be punished. 3) You shall go with me.

17、 允诺对方允诺对方警告警告命令命令概括一下：shall表示说话人意志的不可更改will 的主语是第一、二、三人称的陈述句，表意愿的主语是第一、二、三人称的陈述句，表意愿或承诺自己（将如何）。或承诺自己（将如何）。1） If you will come to my house，I will show you my new painting.2）-Please remember me to your family. -I will.3) Dont forget to bring your homework. -I wont. 1. It _ be the postman at the door.

18、Its only six oclock. （2011江西卷）江西卷） A. mustnt B. cant C. wont D. neednt B 2. John promised his doctor he _ not smoke, and he has never smoked ever since. (08北京）北京） A. might B. should C. could D. would3. -I havent got the reference book yet, but Ill have a test on the subject next month. -Dont worry. You _ have it by Friday. A. could B. shall C. mu