1、Section Grammar情态动词语 境 自 主 领 悟先观察原句后自主感悟The topic of the poem cant be travel.It must be something more personal.It may be friendship.It might be the journey through life.Li Bai must have had a strange life.He cant have been interested in a normal job.He may have died when he fell out of a boat.You s
2、hould read the poem sometime.Could you answer a few questions，please？I told her to stop singing，but she wouldnt listen.1.句中黑体部分在句中均作推测；其中句表示对过去所发生的事情的推测。2.句表示说话人的意愿，意为“应该”，句表示“请求”，句表示意愿。考点一情态动词表推测1情态动词表推测的三种句式(1)在肯定句中一般用must(一定)，may(可能)，might/could(也许，或许)。At this time my father must be working in hi
3、s office，isnt he?在这个时候，我父亲一定正在办公室工作，是吗？He was afraid they might not agree with him.他担心他们可能不同意他的意见。(2)否定句中用cant/couldnt(不可能)，may not/might not(可能不)。They cant be at work now，for I saw them eating in the restaurant just now.他们现在一定没有在上班，因为我刚才看见他们在餐馆吃饭。He may/might not know the scientist.他也许不认识那位科学家。(3)疑
4、问句中用can/could(能)。Could he have finished the task?他可能把任务完成了吗？Can he be at home now?他现在能在家吗？即时演练1用适当的情态动词填空He must be ill.He looks so pale.He was afraid they might not agree with him，but I am not quite sure.It can/could not be the headmaster.He has gone to America.Someone is knocking at the door.Who c
5、an it be?2情态动词表推测的三种时态(1)对将来情况的推测，用“情态动词动词原形”。She must/may/might arrive before 5：00.5点前她一定/可能/也许到。(2)对现在或一般情况的推测，用“情态动词be”“情态动词be doing”或“情态动词动词原形”。At this moment，our teacher must/may/might/could be correcting our exam papers.这时，我们老师一定/可能/也许在批改试卷。Mr.Bush is on time for everything.How can/could he be
6、 late for the opening ceremony?布什先生一向准时，这次开幕式他怎么可能迟到呢？(3)对过去情况的推测，用“情态动词have过去分词”。I didnt hear the phone.I must have been asleep.我刚才没有听到电话，我想必是睡着了。The door is locked.He can not have been at home.门锁着，他不可能在家。即时演练2单句语法填空Listen，he must be reading(read)English.Since nobody gave him any help，he must have
7、done(do) the research on his own.It is important to know about the cultural differences that may cause(cause) problems.3情态动词表推测的特殊用法(1)can除了表推测，用于疑问句和否定句中外，还可以表示“在某段时间内一时的可能性”。It can be quite windy there，especially in spring.那里有时容易刮风，特别在春季。(2)must表示“一定，非得；偏要”，强烈语气。If you must smoke，you can smoke in
8、that room.如果你偏要吸烟，你可以在那个房间吸。考点二情态动词could，should和would的用法1could的用法(1)could表示推测，表示某事有可能发生或可能是事实。在肯定句中没有must那么有把握；在否定句中没有cant那么有把握。He couldnt be a bad man.他不大可能是坏人。(2)could还可以用于表示客气、委婉或礼貌的请求语气。Excuse me，could you tell me the way to the bus station?请问你能否告诉我去车站的路？Im afraid that we couldnt give you any de
9、finite answer at this moment.恐怕我们这时还无法给您任何确切的答复。(3)could have done表示“可能已经”。此外，它还可以表示“本能够做某事(而没有做)”，暗含惋惜之情。You could have done it well，but you were too careless.你本可以做好的，但是你太马虎了。Where could she have gone last night?她昨晚可能到哪里去了呢？2should的用法(1)表示义务、建议、劝告，意为“应该”，用于各种人称。其同义词是ought to。Every citizen should ob
10、ey the law.每个公民都应当遵守法律。(2)表示推测：用于肯定句，表示按常规、常理的推测，意为“按理说应该”。If all goes according to plan we should be in Shanghai tomorrow.如果一切按照预定的计划进行，明天我们就在上海了。(3)表示说话人对某事不能理解，感到意外、惊异等意思。意为“竟会”。Its strange that he should be late.真奇怪，他竟会迟到。(4)用于从句中表示虚拟语气。If it should rain tomorrow/Should it rain tomorrow，dont exp
11、ect me.万一明天下雨，就不要等我了。(5)should have done sth.表示“本应该做某事，但事实上却没有做”；shouldnt have done sth.表示“本不该做某事，但事实上做了”。You should have got up earlier.你本应该早点起床的。3would的用法(1)表示请求、建议等，would比will委婉客气。在疑问句中用于第二人称。Would you please lend me your pencil?请把铅笔借给我用用好吗？(2)表示意愿，在陈述语气和虚拟语气中都可用。He would not leave before he fini
12、shed his work.他在完成工作以前不愿离开。(3)表示过去的习惯、例行的活动或过去的一种倾向。He would sit at the table，deep in thought.他总是坐在桌边，陷入沉思。(4)用在虚拟语气的主句中。If you went to see him，he would be delighted.如果你去看他，他一定非常高兴。She would have come if she hadnt been so busy.要不是因为忙她就来了。即时演练3选词填空：could，should，wouldThe door would not open，no matter
13、how hard she pushed.You cant imagine that a wellbehaved gentleman should be so rude to a lady.I could not have enjoyed myself moreit was a perfect day.单句语法填空1It can not be our headmaster.He has gone to America.2Why must you interrupt me while Im watching TV?3I was surprised that he should pass the e
14、xam.4I love the weekend，because I neednt get up early on Saturdays and Sundays.5It was really annoying；I couldnt get access to the data bank you had recommended.6The train is to start soon and Mike hasnt arrived.What can have happened to him?7I should have handed in my homework yesterday，but unfortu
15、nately I forgot about it totally.8She looks very happy.She must have passed the exam.I guess so.Its not difficult after all.9It may sound like a perfect destination，but it is really adventurous to go there.10When he was there，he would go to that coffee shop at the corner after work every day.单句改错(每小
16、题仅有1处错误)1He must put his wallet somewhere else last night.must后加have2Someone has cleaned the room.Who may it be？maycan/could3It mustnt be the postman at the door.Its only six oclock.mustntcant4He can come this afternoon，but he said he wasnt certain what his plans were.canmay/might5My MP5 isnt in my
17、bag.Where must I have put it？mustcan/could6When he lived in the city，he will go to the park every day.willwould7Im surprised that he shall speak to his mother in that way.shallshould8You should to help her with English in your spare time.去掉to9You can have passed the exam，but you were too careless.cancould10He was able escape from the burning building.able后加to