七年级下学期U6Grammar.ppt

Grammar,A Can and cannot,We can use electricity to make many things.We cannot/cant see electricity.Can you think of an example?Yes,I can./No,I cannot/cant.,Modal verbs,We use can and cannot(cant)to say we are able or unable to do something.,can/cannot are words to show our abilities,can be able to 能，能力 e.g.我可以唱一首英语歌曲。I can/am able to sing an English song.过去式：could e.g.我十年前就能做到那样。I could do that 10 years ago.否定式：cannot=cant could not=couldnt,Peter can speak English.否定 Peter cant/cannot speak English.一般疑问句 Can Peter speak English?(一般疑问句，提前情态动词)特殊疑问句 What can Peter speak?,Hi and Lo are talking about themselves.What are they saying?Read their conversation and then complete the statements below with Can or Cannot.,1.Hi _ play football.2.Lo _ paint.3.Hi _ speak as many languages as Lo.4.Both Hi and Lo _ dance.5.Lo _ drive a car,but he _ play chess.6.Hi _ swim,but he _ play the guitar.,can,can,can,can,cannot,cannot,cannot,cannot,May/Can I use your mobile phone？Yes,you may/can.Sure./Certainly.No,you may not/cant.You may/can turn on the TV.You may not/cannot play in the kitchen.,B May and may not,We use may and may not to ask for and give permission(许可).We also use can and cannot(cant)for the same purpose（目的）.,may=can 许可 e.g.你可以睡在这儿。You may sleep here.e.g.May I sit here?(更礼貌)=Can I sit here?Tell difference:e.g.You can smoke here.(口语)=You may smoke here.(礼貌，正式)否定式：may not(无缩写),Daisy is not feeling well today.Benny is at home with her.Read their conversation below.Fill the blanks with may or can.,Benny:How are you feeling,Daisy?Daisy:Not very well.Benny:_ I get you a chair?Daisy:Yes,thanks.Benny:Im going out._ I borrow your bicycle,Daisy?Daisy:Yes,you may.Before you go to meet your friends,can you come and see the doctor with me?Benny:Yes.I _._ I carry your bag for you?Daisy:Yes,you may.Thats so kind of you,Benny.Im ready to go._ you open the door for me?,May,May,can,Can,May,C Must and must not,We use must and must not(mustnt)to tell people what to do or what not to do.,You must not/mustnt do that，Benny.We must always be careful with electricity.They must not/mustnt play near the heater.,After modal verbs such as can,may and must,we use(the base form/the ing form/the ed form)of a verb.,Work out the rule,must=have to 必须 e.g.You must make a plan before doing any work.否定式：must not=mustnt-Must I stay here?-No,you neednt.,Daisy saw a doctor.The doctor told her what to do and what do not do.Help her write down the doctors instructions.,drink more water go to bed earlyeat cold food share cups with othersgo out alone take the medicine on time,I must drink more water._I must not _,I must go to bed early.,I must take the medicine on time.,eat cold food,I must not go out alone,I must not share cups with others,“肯定推测”must+V原“一定是”e.g.-What is Tom?-He is wearing school uniform.He must be a student.must can could may might“否定推测”cant+V原“不可能”e.g.-Where is Tom?-He went away with Tom.He cant be in the library.cant couldnt may not might not,拓展-推测,拓展(推测,“可能”),He is in the classroom.100%must 99%(must表推测，用于肯定句)e.g.He must be in the classroom.他肯定在教室。may 50%(may表推测，用于肯定句)e.g.He may be in the classroom.他有可能在教室。cant/couldnt(can/could表推测，用于否定句)e.g.He cant be in the classroom.他不可能在教室。,must 表示说话人的主观看法 have to 表示外界客观事实，即“不得不”。e.g.The head teacher gives us such an important work to do.We must do our best.e.g.The room is dark.I have to turn on the light.,拓展（must 与 have to 的区别）,can 用于一般现在时（can）一般过去时（could）be able to 用于一般现在时（am/is/are able to）一般过去时（was/were able to）一般将来时（will be able to）,拓展（can与 be able to 的区别）,用本单元所学的情态动词填空。1.Kate,you have won the English competition!Oh,it _ be true.I made a lot of mistakes in it.2.You _ talk to your grandparents like that.Its impolite.3.We _ wash our hands before meals.It is good for our health.,cant,mustnt,must,4.Excuse me,_ you tell me the way to the nearest park?5.You _ go with us to the zoo if you want to.6.I _ speak Chinese very well,but I _ speak French at all.,could,can/may,can,cant,1.我会游泳但玛丽不会。I _ _ but Mary _.2.我八点之前必须完成作业。I _ _ my homework before eight oclock.3.我可以进来吗，陈老师？_ _ come in,Miss Chen?4.你不可以在这里打篮球。You _ _ _ here.,Exercise 1:根据中文意思完成句子。,can swim cannot,must finish,May I,mustnt play basketball,单项选择。,()1._ you help me with this maths problem?I _ not work it out.A.Can;may B.Must;must C.Can;can D.May;may()2.The boy _ run very fast.He wants to be a top runner as Liu Xiang in the future.A.canB.cantC.mayD.may not,C,A,()3.May I go to the cinema,Mum?Certainly.But you _ be back by 11 oclock.A.can B.may C.mustD.need()4.Must I finish the work before five oclock?No,you _.A.mustntB.neednt C.may not D.cant()5.You _ talk here.It is against the rules.A.mustnt B.must C.may not D.can,C,B,A,Exercise 2:单项选择。,6.-May I watch TV,Dad?-No,you _.You must finish your homework first.A.mustnt B may not C.couldnt D.might not7.-_ you carry the bag by yourself?-Yes,I can.A.MustB.CanC.Should D.May8.You _ throw rubbish everywhere.A.mustntB.cant C.may notD.couldnt,Exercise 2:单项选择。,9.-_ I borrow these magazines?-Sorry,only the magazines over there can be borrowed.A.NeedB.would C.MustD.May 10.Its the library!So you _ not shout here.A.mustB.canC.should D.may11.Many people like Jay Chou because he _ write and sing popular songs.A.mustB.canC.should D.may,