情态动词的用法优质公开课重大三起6下课件.ppt

情态动词的用法,情态动词的用法,Yes,she can.,Can she come to the party?,Can she,Yes,she can.Can she come to th,No,he cant.He has to study.,Can he go to the baseball game?,Can he,No,he cant.Can he go to the b,Can they come to the party？,No，they cant.They have to study for the math test.,Can they,Can they come to the party？No,Grammar Focus,Can you come to my party on Sa,情态动词主要有：may/might,can/could,must,have to,shall/should,will/would,ought to,need,dare,used to。,Grammar focus,现在我们来着重学习情态动词can 以及have to 的用法。其特征主要有：,情态动词主要有：may/might,can/could,G,1.不能独立作谓语，只能和动词原形一起构成谓语，表示说话人的语气和情态。2.没有人称和数的变化。(have to除外)3.否定形式：在其之后加not(have to除外)。疑问形式：情态动词提到主语之前(have to 除外)。,1.不能独立作谓语，只能和动词原形一起构成谓语，表示说话人,can为情态动词,在本单元中表示请求,用于发出邀请，后跟动词原形。当同意接受对方的邀请时,常用Sure,Id love to./Certainly./Of course.等来回答；若不接受,常用Sorry等来有礼貌地拒绝,一般情况下需要说明不能接受邀请的原因以表示歉意。,can为情态动词,在本单元中表示请求,Can you come to my birthday party tomorrow？明天你来参加我的生日聚会，好吗？Sorry,I cant.I am going to visit my grandpa.很抱歉，我来不了，我要去看我爷爷。,Can you come to my birthda,1.can/may都可表示“许可”。may用于较正式、客气的场合，而can比较随便（口语）。You may/can smoke here.Borrowers may not take out of the library more than two books at a time.The policeman says you cant park here.,1.can/may,(2)May/Can I/we?表示征询对方许可。Can you?表示请求。May I use your phone?Yes,you may./Yes,please./No,you may not./No,you mustnt./No,youd better not./Im afraid not.,(2)May/Can I/we?表示征询对方许可。,/Im sorry.Id rather you didnt.Can I go out and play,Mum?Yes/Certainly,you can./No,you cant.Can you help me with this bag?With pleasure./Sorry,I cant.,/Im sorry.Id rathe,Mr.Reed looks pale.He may be ill.(事实上的可能).Mr.Read is in poor health.He can be ill at any time.(逻辑、理论上的可能)This news may be true.(=might/could)(事实上的可能)Wang Wei can be really stubborn.(有时或偶然可能会)(=could),(3)都可表示“可能性”,肯定句,Mr.Reed looks pale.He may,否定句This news may not be true.(也许不,=might not)This news cant be true.(不可能,=couldnt)疑问句Can this news be true?(=Could)May this news be true?,否定句,(4)can 还可表示“能力”、“能够”You can swim,cant you?No,I cant.I cant promise anything,but Ill do what I can.Tickets can be bought from the Tourist Information Center.,(4)can 还可表示“能力”、“能够”,2.might/could 分别为may和can的一般过去时，分别表示过去的“许可”、“可能”和“能力”、“能够”等。The children asked whether they could/might go for a swim.(过去许可)I was afraid it might rain that afternoon.(过去可能)He asked if the news could be true.(过去可能)(Can the news be true?),2.might/could,She said he could speak several languages.(过去能力)I couldnt find her telephone number.(过去能够)(2)都可表示现在或将来的“可能性”。语气没有may肯定。Theres someone at the door.It could/might(=may)be George.(肯定句),She said he could speak sev,/It couldnt(=cant)be George.(否定句)/Could(=Can)it be George?(疑问句)According to the radio it could/might/may rain tomorrow.Lightning could(=can)be dangerous.(3)Might/Could I/we?Could you?,/It couldnt(=cant)be,表示更委婉、更客气的请求。Might/Could I ask you one more question?Yes,of course you may/might/can/could.Could you help me with these boxes?Of course I can./With pleasure.,表示更委婉、更客气的请求。,有时在陈述句中也表示更委婉、更客气的请求或邀请：I wonder if I could/might leave now.I dont suppose you could/might.,有时在陈述句中也表示更委婉、更客气的请求或邀请,3.can/be able tocan=am/is/are able to=shall/will be able to No one can do it.=No one is able to do it.Can you come tonight?=Will you be able to come tonight?,3.can/be able to,(2)could 表示过去的技能、本能;was/were able to 表示过去某一具体场合经过努力而做成某事。I could swim when I was six.He started late,but he was able to catch the eight oclock train.=but he managed to catch=but he succeeded in catching,(2)could 表示过去的技能、本能;was/wer,But:Mr.Smith couldnt/wasnt able to see you because hes got a bad cold.(3)be able to还有完成式和非谓语形式。Im sorry I havent been able to answer your letter.=Im sorry for not being able to answer your letter.To be able to run is very important for a footballer.,But:,4.have to的意思是“必须、不得不”,往往 强调由于客观原因而必须做某事。have to 后接动词原形；have to有人称、数和时态的变化,其第三人称单数形式为 has to,其疑问形式和否定形式要借助于 助动词do或does来完成。例如：,4.have to的意思是“必须、不得不”,往往,We have to look after our sister at home.我们不得不在家照顾我们的妹妹。Does he have to get up early tomorrow morning?明天早上他必须早起吗？I dont have to stay at home today.今天我不必呆在家里。,We have to look after our sist,情态动词“have to”与其他的情态动词如“can”,“may”“must”和“should”不同。1)这4个情态动词没有人称的变化,而have to有,它的第三人称单数 为“has to”如：He should study hard.He has to study hard.,情态动词“have to”与其他的情态动词,2)这4个情态动词在一般疑问句中将它们放 在句首,在否定句中直接在他们后边加not即可。我们以can为例:-Can he go with us?他能和我们一起去吗？-He cant go with us.他不能和我们一起去。而“have to”要加助动词do,does或did才可能完成其疑问句、否定句。,2)这4个情态动词在一般疑问句中将它们放,5.must/have to must 表示主观“必须”；have to表示客观客观需要，即“不得不”。I dont like this TV set.I must buy a new one.This TV set doesnt work.We have to buy a new one.(now),5.must/have to,You must get up at five tomorrow.We(will)have to get up early tomorrow were going to Devon.(future)I had to leave early because I wasnt feeling well.She said she must/had to see the manager.(past),You must get up at five tom,表示邀请的句型:(你能来参加我的聚会吗?),Can you come to my party?,Could you come to my party?,Would you like to come to my party?,接受邀请:拒绝邀请:,Sure,Id love/like to.,Im sorry,I cant.I have to/Im V-ing,Task 总结,表示邀请的句型:(你能来参加我的聚会吗?)Ca,Exercise,一、选择正确的词1.Thank you for(ask/asking),but I cant go to the movies with you.2.Paul has to study(at/for)the math test tonight.3.My sister has too(much/many)homework to do.,asking,for,much,Exercise 一、选择正确的词askingformuch,4.Can you come to my party(at/on)Saturday night?5.She invites me(watch/to watch)the basketball match the day after tomorrow.6.I like playing(piano/the piano).,on,to watch,the piano,4.Can you come to my party,二.对话填空。每空一词，单词的首字母已给出。A:Hey,Xiao Wang,can you go to the m_ on Saturday?B:Im s_,I cant.I have too much h_ this weekend.And Im not f_ _ well today.A:Thats too b_.Whats the matter?,ovies,orry,omework,ad,eeling,二.对话填空。每空一词，单词的首字母已给出。ovies o,B:Im not sure.Maybe I have a c_,as Im feeling a little cold.A:I think youd b_ go to the d_.B:I also t_ so.A:Maybe Im asking you to come another time.B:Sure.T_ for asking.,old,etter,octor,hink,hanks,B:Im not sure.Maybe I have,三、选择题1.Can you play tennis with on Saturday?A.us B.we C.our D.ours2.Henry his homework this afternoon.A.have to do B.have to doing C.has to do D.has to doing3.Tony is playing tennis the school team.A.on B.in C.to D.with4.Jim play soccer with his friend this weekend,because he is very busy.A.can B.cans C.cannt D.cant,A,C,B,D,三、选择题ACBD,5.-?-Its October the 14th.A.When is today B.whats today C.What time is today D.What day is today6.He is with his father the whole day.A.fish B.fishes C.to fish D.fishing,B,D,5.-,7.Can you come to my party?-.A:Sure,I love B:Sure,I love to C:Sure,Id love to D:Sure,Id love.,C,7.Can you come to my party?C,8.-Would you like to play football with us?-_,but Im busy.A.No,I cant B.No,I wouldnt C.Yes,Im glad D.Yes,Id love to 9.-_I take the newspaper away?-No,you mustnt.You _ read it only here.A.Must;can B.May;can C.Need;must D.Must;must,A,B,8.-Would you like to play f,Its a Birthday Party,Friday,June30,at four hirty,Lisas house,15th Street,Come and have fun!,For whom:,Time:,Place:,Lisa,Homework,Write an invitation based on the following information.,Its a Birthday Party Friday,J,Thank You!,Thank You!,