1、 情态动词can may mustThey can sing!简介They can ride a bike.He can not drive a car.can+动词原形（无人称和数的变化）1.1.表示能力（体力，知识，技表示能力（体力，知识，技能等）。能等）。Mary can speak three Mary can speak three languages.languages.=Mary_=Mary_speak three speak three languages.languages.（1 1）.can.can只有一般现在时一只有一般现在时一般过去时。般过去时。I will not b
2、e I will not be able to come this able to come this afternoon.afternoon.(2).(2).表示经过努力才得以做成表示经过努力才得以做成某事某事 -be able to-be able to2.2.表示请求，允许表示请求，允许-Can I go now?-Can I go now?-Yes,you can/No,you can-Yes,you can/No,you can not.not.3.3.表示可能性猜测表示可能性猜测He cant(couldnt)have He cant(couldnt)have enough mon
3、ey for a new enough money for a new car.car.4.4.表示对现在动作或状态的猜表示对现在动作或状态的猜测，主要用于否定句和疑问句测，主要用于否定句和疑问句中或感叹句中中或感叹句中:He cant(couldnt)be He cant(couldnt)be over sixty.over sixty.他不可能超过他不可能超过六十岁。六十岁。5.could5.could表示比表示比cancan更委婉客气更委婉客气的提出问题或陈述看法，指的的提出问题或陈述看法，指的是现在时间。是现在时间。Could you lend me a Could you lend
4、me a hand?hand?帮我一把好吗？帮我一把好吗？1._ I take it out?Im sorry,you _.()A.Could.couldnt B.Might.might not C.Could.can D.May.can2.Listen!Helen is singing in the next room.It_be Helen.She has gone to Beijing.()A.cant B.mustnt C.may D.should3._I smoke here?()No,you mustnt.A.Can B.May C.Must D.Need简介-May I visi
5、t Lucy on Sunday,Mum?-Yes,you may.1）表允许，询问或说明一件事可不可以做，might指过去时间；但在疑问句中might也可指现在时间，语气比may更委婉。May(Might)I ask for a photo of your baby?在回答以may引起的问句时，肯定回答是一般可仍用may,或Yes,please./Certainly./Sure./Of course.；否定回答根据说话人的语气由强到弱分别选用:must not(mustnt)（禁止）/had better not（最好别）/may not（不行）用用 法法简介 1 1）表示）表示“必须必须”
6、（主观看法）时，用于肯定（主观看法）时，用于肯定句或疑问句；用于否定句时表示句或疑问句；用于否定句时表示“禁止禁止”。We must do everything step by step.We must do everything step by step.我们一切都必须循序渐进地做。我们一切都必须循序渐进地做。You must get home before 9:00.You must get home before 9:00.2 2）表示揣测。意为）表示揣测。意为“想必、准是、一定想必、准是、一定”等，等，只用于肯定句。只用于肯定句。He must be ill.He looks so p
7、ale.He must be ill.He looks so pale.他准他准是病了。他的脸色苍白。是病了。他的脸色苍白。3)must3)must的疑问句，肯定回答用的疑问句，肯定回答用mustmust，否定回否定回答用答用needntneednt或或dont have todont have to。1._ to have lunch with us today?()A.Do you likes B.Would you like C.Will you liked D.Have you liked2.-Is John coming by train?-He should,but he _ no
8、t.He likes driving his car.()A.must B.can C.need D.may3.Peter _ come with us tonight,but he isnt very sure yet.()A.must B.can C.may D.will4.I thought you _ be hungry,so I have brought you some cakes.()A.may B.might C.can D.could5.Come on!We _ hurry because there isnt much time left.()A.may B.must C.
9、can D.need6.Would you like to drink some juice?Thanks._,but I have drunk a lot if tea.A.Id love to B.I think so C.Im afraid not D.I dont think so.7.May I smoke here?No,you_!Look,there is a“NO SMOKING”sign here.A.may B.may not C.neednt D.mustnt8.Listen!Helen is singing in the next room.It_be Helen.Sh
10、e has gone to Beijing.A.cant B.mustnt C.may D.should9.What do drivers do when the traffic lights turn red?They_stop and wait till the green light.A.must B.can C.may D.need10.She _ know the answer，but Im not sure.A.maybe B.may be C.may D.mustAcan/couldBmay/mightCmust课堂小结1.-You must come back every mo
11、nth.-Yes，I _.A.will B.must C.should D.can2.She _ know the answer，but Im not sure.A.maybe B.may be C.may D.must3.-Must we clean the room right now？-No，you_.You _clean it after lunch.A.neednt；may B.neednt;must C.Mustnt；can D.mustnt；may4.John_ come to see us tonight，but he isnt very sure yet.A.may B.ca
12、n C.has to D.must5.Children _ play with fire.A.mustnt B.cant C.shouldnt D.neednt6.-_ I come in，Mr Green？-Yes,come in，please.A.Must B.Need C.Will D.May7.-Must I finish the work today？-No，you _.You _ finish it tomorrow.A.mustnt；may B.cant；can C.neednt；may D.neednt；must8.John_ come to see us tonight,but he isnt very sure yet.A.may B.can C.has to D.must9.They _ do well in the exam.A.can be able to B.be able to C.can able to D.are able to10.-May I take this book out?-No,you_.A.cant B.may not C.neednt D.arent
