1、八下语法复习 unit 3-unit 4 情态动词情态动词could的用法的用法 情态动词could可用于有礼貌地向对方提出要求或请求，也可用于提出建议。它本身不能作谓语，必须和不带to的动词原形一起构成谓语。Unit 3 用于提出要求或请求用于提出要求或请求 “Could you please.?”意为“能请你能请你吗？吗？”，用于提出要求或请求。否定形式为Could you please not.?肯定回答 Yes,sure./Of cousre.是的，当然可以。No problem.没问题。With pleasure.乐意帮忙。Sure./Of course./Certainly,I c
2、an.当然可以。Could you please lend me your bike?Sure./Of course./Certainly,I can.Sorry,I cant.I have to.对不起，我不能，我得 Sorry,Im going to.对不起，我将 Im afraid I cant.I have to.我恐怕不能。我得 Im afraid not.恐怕不行。Could you please go hiking with me tomorrow?Sorry,I cant.I have to prepare for a competition.否定回答 肯定回答及否定回答中,均
3、不用could,而是要用can代替could。用于征得许可用于征得许可 “Could I.?”意为“我能我能吗？吗？”，用于请求对方允许自己做某事。Could I have a look at your new watch?Of course you can.Here you are.Mum,could I go out for a while?Im afraid you cant.You have to wash your clothes first.Yes,you can./Of course you can./Yes,please.Sorry,you cant./Im afraid yo
4、u cant./No,you mustnt.否定回答 肯定回答 特别提醒：特别提醒：Could/Can I come in?表示请求允许（即请求别人允许自己做某事），表示请求允许（即请求别人允许自己做某事），could和和can都可以用，但都可以用，但could语气更委婉。语气更委婉。Could I use your pen?Of course you can.对别人的请求许可的回答，一般只用对别人的请求许可的回答，一般只用can，而不用，而不用could。用于表示能力用于表示能力 could 表示过去的能力，表示现在的能力用表示过去的能力，表示现在的能力用can。此时。此时could是是ca
5、n的过去式。的过去式。Could you speak English then?Looking down from the plane,we could see the light on the runway.表示推测表示推测 You could be right,but I dont think you are.(对现在的推测)We could go there this summer.(对将来的推测)后接动词原形，表示对现在或将来的推测。后接动词原形，表示对现在或将来的推测。Where could he have gone?She couldnt have left so soon.后接动
6、词的完成式，表示对过去的推测。后接动词的完成式，表示对过去的推测。表示建议表示建议 You could go to the station by subway.You could do housework for your mother.“You could.”表示提建议，意为表示提建议，意为“你可以你可以”。Exercises 一、单项选择一、单项选择 1.Could you tell me how to pay for the food by QR code(二维码)on the phone?_.A.Take it easy B.It doesnt matter C.With pleasu
7、re D.Youre welcome 2.Gina,could you please play the drums on the art festival?_ I can only play the guitar.A.Im afraid I cant.B.Yes,I can.C.Sure,Id love to.C A 3.Could you please help me wash the car,Tony?_,Im studying for my coming English test now.A.Thats right B.Im sorry C.It doenst matter D.Not
8、at all 4.Could I invite my friends to the party on Saturday,Mom?Of course you _.That sounds like fun.A.may B.could C.must D.can 5.Li Ming _ speak two languages when he was eight years old.A.may B.can C.cant D.could D B D 6.David,_ you please sweep the floor and take out the rubbish?OK.Mum.A.could B.
9、may C.should D.must 7.Mum,its too hot._ I swim in the lake?No,you _.Thats too dangerous!A.Should;cant B.Need;mustnt C.Must;neednt D.Could;mustnt D A 二、二、完成句子完成句子 1.杰克，请你把垃圾倒掉好吗？Jack,_ _ _take out the rubbish?2.下课后我们能去踢足球吗？_ _ _ fooball after class?3.我能借你的伞用一下吗？_ _ _ your umbrella?could you please Co
10、uld I borrow Could we play until作连词，意为作连词，意为“直到直到”，引导时间状语从句。，引导时间状语从句。Ill stay here until you come back.1.主句是肯定句时，其谓语用延续性动词，强调主句的动作或状态一直持续到从句的动作发生时为止，译成“直到为止”。We cant get off the bus until it stops.We didnt start our discussion until he arrived.2.主句是否定句时，其谓语用非延续性动词，强调主句的动作在从句的动作发生之后才开始，一般译成“直到才”。unt
11、il 引导的引导的时间状语从句时间状语从句 Unit 4 so that 引导的引导的目的状语从句目的状语从句 so that意为意为“为了，以便为了，以便”，引导目的状语从句，相当于，引导目的状语从句，相当于in order that，从句中多含有，从句中多含有can,could,may,might等情态动词。等情态动词。I took a taxi so that I could get there earlier.The movie was boring so that half of the audience was asleep.【拓展延伸】so that还可引导结果状语从句，意为“因
12、此；所以”，此时从句中通常不含情态动词。although引导的引导的让步状语从句让步状语从句 although意为意为“尽管；然而尽管；然而”，引导让步状语从句，相当于，引导让步状语从句，相当于though。Although we are neighbors,I dont know them well.Although she was in poor health,she continued to carry out her duties.Although/Though he was badly ill,he still went to school.【注意】although或though不能
13、与but用在同一个句子中，但可以与yet,still同时使用。表建议的句型 1.Why dont you do sth.?=Why not do sth.?你为什么不做某事？你为什么不做某事？Why dont you try once more?=Why not try once more?2.Shall we do sth.?我们做某事好吗？我们做某事好吗？Shall we meet at the school gate?3.Lets do sth.让我们做某事吧。让我们做某事吧。Lets go to a restaurant for a change.4.You/We had better
14、 do sth.你（们）你（们）/我们最好做某事。我们最好做某事。Youd better go to hospital at once.5.You/We(not)should do sth.你（们）你（们）/我们（不）应该做某事。我们（不）应该做某事。We should ask our teacher for help.6.You/We could.你（们）你（们）/我们可以我们可以 You could go to the movies instead of staying at home.表建议的句型 7.Would you like sth./to do sth.?你想某物你想某物/做某事
15、吗？做某事吗？Would you like to go to the Great Wall?Would you like some drink?8.What/How about(doing)sth.?（做）某事（做）某事/某物怎么样？某物怎么样？What/How about watching a film this weekend?What/How about a bowl of noodles?【特别提醒】perhaps也可用于提建议，常位于句首。Perhaps you can park your car over there.表建议的句型 回答建议的句型 肯定回答肯定回答 Good ide
16、a./Thats a good idea.好主意。好主意。OK./All right./Great.好。好。Yes,please./Id love/like to.好的。好的。/我愿意。我愿意。Sounds good/great.听起来不错。听起来不错。No problem.没问题。没问题。Sure./Of course./Certainly.当然可以。当然可以。I cant agree more.我非常同意。我非常同意。Yes,I think so.好的，我也这样认为。好的，我也这样认为。否定回答否定回答 回答建议的句型 I dont think so.我不这样认为。我不这样认为。Sorry
17、,I cant.对不起，我不能。对不起，我不能。Id love/like to,but.我很乐意，但是我很乐意，但是 Im afraid.我恐怕我恐怕 What a pity!I have to.真遗憾！我不得不真遗憾！我不得不 Exercises 一、单项选择一、单项选择 1.Why not hold a Chinese Poetry Competition to welcome our schools 70th birthday?_ Lets make a plan together in our group.A.Thats all right.B.Yes,please.C.Good id
18、ea.D.Never mind.2.I feel stressed from time to time.Could you give me some advice?_ sharing your worries with your paretns?A.Why dont you B.How about C.Why not D.Would you like C B 3.Susan,would you like another cake?_.Im full.A.Yes,please B.My pleasure C.No,thanks D.Not at all 4.Its nearly lunchtim
19、e.How about having some noodles and dumplings?_.A.Youre welcome B.Thats all right C.Thats nice of you D.That sounds good C D 5.The old man leads a simple life,_ he has a lot of wealth.A.although B.so C.unless D.because 6.Lucy,you cant use the phone _ we are far from the gas(天然气)station.OK,I wont do
20、that again.A.after B.when C.though D.until A D 7._ its a public holiday today,some firefighters in our city are still on duty.A.Although B.Once C.If D.Unless 8.Jim,lets go out to play basketball.Oh,I wont do that _ I finish my homework.A.if B.until C.because D.since 9.You could climb the mountains _
21、 you can keep healthy.A.until B.so that C.as soon as D.in order to A B B 1.你为什么不和你父母谈谈?_ _ _ talk to your parents?2.你应该邀请她参加你的生日聚会。You _ invite her to your birthday party.3.虽然我尽力了，但考试还是没及格。_ I tried my best,I failed the exam.4.老师大声说话，以便所有的学生都能听到。The teacher spoke loudly _ _all the students could hear him.二、二、完成句子完成句子 Why dont you Although should so that