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1、enjoy dinner with my family.A:Mum,could I go out for dinner with my friends?B:Sure,that should be OK.A:Could I get something to drink with my friends after the movie?B:Sure,you can.A:Could I get something to drink with my friends after the movie?B:No,you cant,you have a basketball game tomorrow.take
2、 the dog for a walk遛狗遛狗A:Can you please take the dog for a walk?B:OK,but I want to watch one show first.take out the rubbish扔垃圾扔垃圾A:Can you please take out the rubbish?B:Yes,sure.Could I go out for dinner with my friends?Sure,that should be OK.Could we get something to drink after the movie?No,you c
3、ant,you have a basketball game tomorrow.Grammar FocusCan you please take the dog for a walk?OK,but I want to watch one show first.Can you please take out the rubbish?Yes,sure.只作情態(tài)動(dòng)詞的只作情態(tài)動(dòng)詞的 can/could,may/might,ought to,must可情態(tài)可實(shí)義的可情態(tài)可實(shí)義的 need,dare 可情態(tài)可助動(dòng)詞的可情態(tài)可助動(dòng)詞的 shall/should,will/would相當(dāng)于情態(tài)動(dòng)詞的相當(dāng)于情
4、態(tài)動(dòng)詞的 have to,used to情態(tài)動(dòng)詞的語法特征情態(tài)動(dòng)詞的語法特征1)情態(tài)動(dòng)詞不能單獨(dú)做謂語情態(tài)動(dòng)詞不能單獨(dú)做謂語,除除ought和和have外外,后面只能接不帶后面只能接不帶to的不定式。的不定式。2)情態(tài)動(dòng)詞沒有人稱情態(tài)動(dòng)詞沒有人稱,數(shù)的變化數(shù)的變化,但有些情但有些情態(tài)動(dòng)詞態(tài)動(dòng)詞,如如can、will也有一般式和過去式也有一般式和過去式的變化。的變化。3)情態(tài)動(dòng)詞的情態(tài)動(dòng)詞的“時(shí)態(tài)時(shí)態(tài)”形式并不是時(shí)間區(qū)別形式并不是時(shí)間區(qū)別的主要標(biāo)志的主要標(biāo)志,不少情況下不少情況下,情態(tài)動(dòng)詞的現(xiàn)在式情態(tài)動(dòng)詞的現(xiàn)在式形式和過去式形式都可用來表示現(xiàn)在時(shí)間、形式和過去式形式都可用來表示現(xiàn)在時(shí)間、過去時(shí)間
5、和將來時(shí)間。過去時(shí)間和將來時(shí)間。1)can的主要用法是：的主要用法是：A.表示體力或腦力的能力：表示體力或腦力的能力：e.g.The girl can dance very well.B.表示說話的推測(cè)表示說話的推測(cè)事物的可能性等事物的可能性等:e.g.Can the news be true?C.在口語中在口語中,can可以表示請(qǐng)求或允許可以表示請(qǐng)求或允許:e.g.Can I sit here?can 和和could：can表示表示“能夠能夠”時(shí)與短語時(shí)與短語be able to同義同義，但但can只用于一般現(xiàn)在時(shí)或過去時(shí)只用于一般現(xiàn)在時(shí)或過去時(shí)，而，而后后者可用于各種時(shí)態(tài)者可用于各種時(shí)態(tài)。
6、另外，。另外，can表示個(gè)人表示個(gè)人有某種能力，而有某種能力，而be able to表示某人通過努表示某人通過努力、克服困難做成某事，相當(dāng)于力、克服困難做成某事，相當(dāng)于succeed in doing sth.；敘述過去事實(shí)時(shí)，最好用；敘述過去事實(shí)時(shí)，最好用was/were able to，因?yàn)?，因?yàn)閏ould只表示過去具有只表示過去具有某種能力。某種能力。如：如：Can you understand the different kinds of English these people are using?Two years later,he was able to speak very g
7、ood Chinese.2)could的主要用法是：的主要用法是：A.could 是是can的過去式的過去式,表示與過去表示與過去 有關(guān)的能力和推測(cè)有關(guān)的能力和推測(cè):e.g.We all knew that the young man couldnt be a doctor.B.could可以代替可以代替can表示請(qǐng)求表示請(qǐng)求,但語但語氣較氣較can客氣、委婉客氣、委婉:e.g.Could you lend me your dictionary?Could I use your bike?3)can和和could接動(dòng)詞的完成形式，表接動(dòng)詞的完成形式，表示可能已經(jīng)做某事。示可能已經(jīng)做某事。can
8、用在否定和疑用在否定和疑問句中問句中,表示不相信、懷疑等態(tài)度。表示不相信、懷疑等態(tài)度。e.g.They cant have gone out because the light is still on.以以could或或would提問時(shí)，不能再以提問時(shí)，不能再以could或或would作答，而應(yīng)該用作答，而應(yīng)該用can或或will。如：如：Could I borrow your dictionary?Yes,of course you can.情態(tài)動(dòng)詞用法小結(jié)情態(tài)動(dòng)詞用法小結(jié)1.情態(tài)動(dòng)詞不能表示正在發(fā)生或已經(jīng)發(fā)情態(tài)動(dòng)詞不能表示正在發(fā)生或已經(jīng)發(fā)生的事情生的事情,只表示期待或估計(jì)某事的發(fā)只表示期待
9、或估計(jì)某事的發(fā)生。生。2.情態(tài)動(dòng)詞除情態(tài)動(dòng)詞除ought 和和have 外外,后面只能后面只能接不帶接不帶to 的不定式。的不定式。3.情態(tài)動(dòng)詞沒有人稱，數(shù)的變化，即情態(tài)動(dòng)詞沒有人稱，數(shù)的變化，即情態(tài)動(dòng)詞第三人稱單數(shù)不加情態(tài)動(dòng)詞第三人稱單數(shù)不加-s。4.情態(tài)動(dòng)詞沒有非謂語形式，即沒有情態(tài)動(dòng)詞沒有非謂語形式，即沒有不定式、分詞等形式。不定式、分詞等形式。could與與can的區(qū)別的區(qū)別 could與與can都是情態(tài)動(dòng)詞都是情態(tài)動(dòng)詞,could是是can的過去式。二者都可用于表示請(qǐng)的過去式。二者都可用于表示請(qǐng)求求,但是用法稍有不同。但是用法稍有不同。can 表示一般性的請(qǐng)求，語氣隨便表示一般性的請(qǐng)
10、求，語氣隨便,常用于常用于熟人之間或長輩對(duì)晚輩熟人之間或長輩對(duì)晚輩,上級(jí)對(duì)下級(jí)的上級(jí)對(duì)下級(jí)的場合。場合。e.g.Can you tell us your story,Tony?Tony，你能給我們講講你的故事嗎？，你能給我們講講你的故事嗎？could表示有禮貌的請(qǐng)求，語氣委婉，表示有禮貌的請(qǐng)求，語氣委婉，常用于非熟人之間或晚輩對(duì)長輩，下級(jí)常用于非熟人之間或晚輩對(duì)長輩，下級(jí) 對(duì)上級(jí)的場合。比如：對(duì)上級(jí)的場合。比如：-Could you tell us if it snows in winter in Australia?-Sure.-請(qǐng)告訴我們請(qǐng)告訴我們,澳大利亞冬天下雪嗎澳大利亞冬天下雪嗎?-
11、當(dāng)然可以。當(dāng)然可以。注意：注意：1.提出委婉的請(qǐng)求在回答中不可提出委婉的請(qǐng)求在回答中不可用用could。A:Could I have the television on?B:Yes,you can./No,you cant.2.在否定、疑問句中表示推測(cè)或懷疑用在否定、疑問句中表示推測(cè)或懷疑用couldnt。He couldnt be a bad man.他不大可能是壞人。他不大可能是壞人。may和和might 表示允許或請(qǐng)求表示允許或請(qǐng)求;表示沒有把握的推測(cè)表示沒有把握的推測(cè);may放在句首放在句首,表示祝愿。表示祝愿。May God bless you!He might be at home
12、.注意注意:might 表示推測(cè)時(shí)表示推測(cè)時(shí),不表示時(shí)態(tài)，只是可不表示時(shí)態(tài)，只是可能性比能性比may小。小。1.兩詞都是兩詞都是“必須必須”的意思的意思,have to 表示客觀的需要表示客觀的需要,must 表示表示 說話人主觀上的看法說話人主觀上的看法,既主觀既主觀 上的必要。上的必要。have to和和must My brother was very ill,so I had to call the doctor in the middle of the night.我弟弟病得很厲害，我只得半夜里我弟弟病得很厲害，我只得半夜里把醫(yī)生請(qǐng)來。把醫(yī)生請(qǐng)來。(客觀上需要做這件事客觀上需要做這件事
13、)He said that they must work hard.他說他們必須努力工作。他說他們必須努力工作。(主觀上要做這件事主觀上要做這件事)2.have to 有人稱、數(shù)、時(shí)態(tài)的變化有人稱、數(shù)、時(shí)態(tài)的變化,而而must只有一種形式。但只有一種形式。但must 可用可用于間接引語中表示過去的必要或義于間接引語中表示過去的必要或義務(wù)。務(wù)。He had to look after his sister yesterday.3.在否定結(jié)構(gòu)中在否定結(jié)構(gòu)中:dont have to 表示表示“不必不必”,mustnt 表示表示“禁止禁止”。You dont have to tell him abo
14、ut it.你不一定要把此事告訴他。你不一定要把此事告訴他。You mustnt tell him about it.你一定不要把這件事告訴他。你一定不要把這件事告訴他。4a.Write R for requests and P for permissions.Then match each one with the correct response.1._ Could I hang out with my friends after the movie?2._Could you please pass me the salt?3._Could I borrow that book?4._Co
15、uld you help me do the dishes?5._Could you lend me some money?PRPRRa.Yes,here you are.b.Hmm.How much do you need?c.Yes,sure.No problem.I finished reading it last night.d.Yes,but dont come back too late.e.No,I cant I cut my finger and Im trying not to get it wet.1d 2-a 3-c 4-e 5-b4b Fill in the blank
16、s in the conversationA:I hate to_ chores.B:Well,I hate some chores too,but I like other chores.A:Really?Great!_I ask you to_ me with some chores then?B:What do you need help with?A:_ you please _my clothes for me?B:I dont want to do that!Its boring!Could dohelpCould foldA:OK.Then_ you _do the dishes
17、 for me?B:Sure,no problem.But_ we go to the movies after that?A:Sure,Ill finish my homework while you help me with the dishes.Then we can go to the movies.couldpleasecould4c Make a list of things your group needs to do for a camping trip.Then discuss who will do bring a tent them and complete the ch
18、art.A:Could you please bring Liu Chang?B:Sure.And could you please?C:Sorry,I cant.I have toTodo list Name Bring a tentLiu Chang Pair work用情態(tài)動(dòng)詞用情態(tài)動(dòng)詞can/could,cant,may,must,mustnt,neednt填空。填空。1.-_ you come and play with us now?-Im afraid I _.I _ do the cooking.I _ come later.2.-_ we clean the windows
19、today?-No,you _.You _ clean them tomorrow.CouldcantmustcanMustneedntcan3.-_ I watch TV this evening,mum?-No,you _.Work _ come first.4.-_ I come in,please?-Yes,please.5.Excuse me._ you tell me the way to the cinema?MaymustntmustCanCanA:Could you help me,please?B:_!A:I want to _these boxes to my home
20、Lets _ the boxes _ the car now.B:_right.A:Oh,the box _ heavy.Can you carry it?B:Yes,I_A:_you _ it to my room?B:Certainly.完成對(duì)話完成對(duì)話CertainlytakeputinAlliscanCouldtakecan;couldWhen I was young I _ climb any tree in the forest.Learning a language _ be a real challenge.couldcan選用正確的情態(tài)動(dòng)詞填空。選用正確的情態(tài)動(dòng)詞填空。Homework 這個(gè)暑假你與父母要去法國去度假，這個(gè)暑假你與父母要去法國去度假，你的寵物你的寵物小貓小貓Mimi需要請(qǐng)需要請(qǐng)Jimmy幫忙照顧。請(qǐng)用下面的幫忙照顧。請(qǐng)用下面的提示詞給提示詞給Jimmy寫份留言。寫份留言。take care of,take for a walk,feed and give some water,play with him,cleanDear Jimmy,_.Li Ming
八年級(jí)英語下冊(cè) Unit 3 Could you please clean your room課件2
