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1、_情态动词_情态动词三用法：情态动词无三单变化 He can fly. 情态动词否定直接加NOT He can not fly. 情态动词后跟动词原形 He can fly.1.义务军团 must/have to:1.Must Have to表面意思上的区别必须（主观）不得不（客观）试用时态的区别现在时态将来时态现在时态:have/has to将来时态: will have to过去时态:had to否定形式的区别Needntdont /doesnt have toWont have todidnt have to 2.猜测军团 :2.肯定猜测否定猜测把握度mustcant 不是mustnt
2、/neednt非常确信,句中通常有证据maymay not半信半疑,句中通常出现”not sure”mightmight not几乎没说,句中通常出现”not sure”肯定推测：must100%可能性 may/can50%60%可能性might/could20%50%可能性否定推测：cant可能性为零，语气强烈 may not可能不，语气不确定3.请求军团：表请求的情态动词用法区别can比较生硬，不礼貌，通常用于上下级， 长辈对晚辈could比较礼貌，最常用maymight过分谦卑，较少用shall只与第一人称连用can与cantcan表示能力，“能,会”表示允许，“可以”Sam can s
3、peak English well.Can I borrow your bike?cant“不会,不能”“一定不，不可能”I cant give you an answer now.The man cant be my uncle.He has gone to Beijing。could与couldntcould“能，会”表示过去的能力。在疑问句中表示委婉的请求。“有可能，也许”Jim could play the piano well when he was young.Could I have a cup of tea?Im not sure when the flight to Amer
4、ica will take off.I think itcould be leaving in an hour.couldnt“不能，不会”He couldnt dive last year, but now he can do it.must与mustntmust表示主观看法，“必须，一定”肯定推测You must finish your homework first!They must be very tired after a long walk. mustnt禁止，一定不要You mustnt play football on the road.may与mightmay表示请求、许可，
5、“可以”“有可能，也许”（把握性不大）You may sit here if you want.Your sister may be waiting for you now.mightmay的过去式。表示请求、许可，语气比may更委婉。表推测，“有可能，也许”，可能性低于may。He asked if he might go home.Might I smoke here?No one knows what might happen in the future.need与needntneed“需要”You need say sorry to him.neednt“不需要”You neednt
6、go with me.should/ought to与shouldntshould“应该”You should keep the room clean.ought to“应该”You ought to sleep early.shouldnt“不应该”You shouldnt speak loudly here.will与wouldwill表示询问、请求，用于疑问句中。Will you pass me a book?would表示自愿、主动做。Jane said she would not talk with angry Tom.shall与had bettershall表示询问、请求，用于第
7、一、三人称。表示决心、警告、命令，多用于第二人称。Shall we go out for a walk?You shall not bring your mobile phones to the classroom in the exam.had better“最好要”You had better have breakfast, or you will not focus on your work.have to与dont have tohave to“不得不”，多表示客观必要。I have to go to work every day.dont have to“没必要”You dont h
8、ave to come here so early.情态动词的基本用法1.A good friend is someone you _ share your pleasure and pain with.A. ought B. need C. can D. must2.Please dont make so much noise. I _hear the speaker very well.A. neednt B. mustntC. cant D. shouldnt 3.Mum, _ I play football this afternoon?Sure, but you _ finish y
9、our homework first.A. may; could B. can; mustC. can; mustnt D. may; cant4.You_ take me to the station. My brothers taking me.A. cant B. mustnt C. shouldntD. dont have to5.We need clean air and water, so we _ protect the environment.A. can B. may C. must D. might6.What should we do to protect the fis
10、h in the river?We_ throw rubbish into the river.A. need B. neednt C. must D. mustnt7.Weve got everything ready for the picnic.Do you mean I _bring anything with me?A.cant B. mustnt C. couldnt D. neednt8.Excuse me, _ I take the magazine out of the reading room?Sorry, you cant. Just here, please.A. mu
11、st B. would C. may D. need9._ I borrow your dictionary?Sorry. Ive left it at home.A. ShouldB. Need C. Must D. Could情态动词表推测10.Finally, they came back. They_be hungry after such a long walk.A. cant B. must C. neednt D.could11.Where are you going this month? We _go to Xiamen, but were not sure.A. needn
12、t B. might C. must D. mustnt12.The girl in the classroom _be Sarah. She has gone to the library.A. may B. must C. cant D. neednt13.Is Tom coming by train? He _drive his car, Im not sure.A. cant B. may C. must D.shouldnt14.Excuse me, is this the right way to the Children s Palace? Sorry, Im not sure. But it _be.A. mustnt B. might C. cant D. must15.Look, the lady in red_be our English teacher. No, she _be. She is in the office now.A.must; cant B. can; mustntC. may; mustnt D. shall; cant答案：1-5 ：CCBDC 6-10: DDCDB 11-15: BCBBA【考例链接】( )1. We need clean air and water, so we _ protec
