七年级英语下册Unit4Don’teatinclass课件人教新目标版.ppt

Tolearnimperatives(Dont.).Tolearntousecanforpermission.Tolearntousemodelverbshaveto,must.,Objectives,PartIWords&ExpressionsPartIIGrammarFocusPartIIIExercises,PartIWords&Expressions,Letslearnsomenewwords.,hallway,hall,dininghall,fight,uniform,dish,dishes,dothedishes,makeonesbed,kitchen,hair,PartIIGrammarFocus,KeyStructures,1.Dontruninthehallways.2.Dontfight.3.Whataretherules?Wemustbeontimeforclass.,4.Canweeatintheclassroom?No,wecant,butwecaneatinthedininghall.5.Canwewearahatinclass?Yes,wecan./No,wecant.,6.Doeshehavetowearauniformatschool?Yes,hedoes./No,hedoesnt.7.Whatdoyouhavetodo?Wehavetobequietinthelibrary.,KeyPoints,一、祈使句功能：命令、警告、要求。结构：省略了主语You的句子。1.动词原形（+宾语）！/Be动词+形容词/名词！(1)Closethedoor,please!,(2)Becareful!Herecomesthecar.2.Dont+动词原形（+宾语）！/Dontbe动词+形容词/名词!(1)Donteatintheclassroom!(2)Dontbelateforclass!3.No+名词/doing！(1)Nosmoking!,(2)Notalking.4.含有祈使句的复合句：祈使句+and+句子。祈使句+or+句子。(1)Workhardandyoullsucceed.=Ifyouworkhard,youwillsucceed.(2)Workhardoryoullfail.=Ifyoudontworkhard,youwillfail.,二、情态动词can的用法（can在肯定句、疑问句、否定句的用法）1.肯定句：Sb.candosth.Wecaneatinthedinninghall.2.疑问句：Cansb.dosth.?Canwelistentomusic?,3.否定句：Sb.cant(cannot)dosth.Wecantlistentomusicinthehallways.,haveto的用法1.肯定句：主语+haveto+动词原形+其他注意：一般现在时：主语是第三人称单数时用hasto，其它时候用haveto（过去时：无论人称和单复数都用hadto.）,(1)Wehavetowearsneakersforgymclass.在体育课上我们必须穿运动鞋。(2)Tomhastopracticetheguitareveryday.汤姆每天必须练习弹吉它。(3)Ihadtogetupat5:00amlastMonday.上周一我不得不早上5点起床。,2.否定句:主语+donthaveto+动词原形+其他。一般现在时:主语是第三人称单数时用doesnthaveto,其它时候用donthaveto。(过去时:无论人称和单复数都用didnthaveto),(1)Nickdoesnthavetowearauniform.尼克不必穿制服。(2)Wedidnthavetodoourhomeworkatonce.我们不必马上完成作业。,3.疑问句：Do/Does/Did+主语+haveto+动词原形+其他(1)Doyouhavetostayathomeonweekends?Yes,Ido./No,Idont.(2)Didhehavetogotobedby11:00lastnight?,情态动词must的用法：must表示说话人的主观看法，及主观上的必要性，还用于命令或愿望。只用于现在时，无人称和单数的变化。在表示过去、将来和完成时，用haveto的相应形式来代替must。,1.在表示有做某一个动作的必要和义务时，它的意思是“必须，应该”。Youmustfinishyourhomeworkfirst.你必须先完成作业。2.表示有很大把握的判断或者推测，意思是“一定，准是”。Thetallmanmustbeyourfather.那个高个子男人一定是你的爸爸。,3.以must开头的一般疑问句，它的否定回答用neednt（不必要），不用mustnt（不允许），mustnt常用于否定句中表示“不允许，禁止”。,(1)MustIgothereonfoot?我必须得走过去吗？No,youneednt.不，你不需要。(2)Youmustntparkyourcarhere.你的车不允许停在这儿。,PartIIIExercises,趁热打铁,一、单项选择1.Canwewearhatsinclass?_.A.Yes,wedoB.No,wedontC.No,wecanD.No,wecant,D,2.CanIuseyourruler?Yes,you_.A.mayB.needC.canD.must3._doyouhavetodoafterschool?Domyhomework,ofcourse.A.WhatB.WhenC.WhereD.How,C,A,4._lateforschoolagain.Sorry,Iwont.A.NotbeB.DontbeC.NotD.Dont5._yourhomeworkafterschool.A.DoingB.TodoC.DoD.Bedo,B,C,1.上课迟到_late_lass2.清洗餐具_the_3.帮妈妈做早饭_mom_breakfast4.整理床铺_onesbed5.对某人要求严格be_sb.,arrive/be,for,do,dishes,二、短语互译,help,make,make,strict,with,1.(Can/Does)_weeatinclass?2.(Dont/Hasto)_wearahattoschool!3.DoesBill(haveto/can)_gotobednow?4.(Do/Haveto)_theywearsneakers?,三、选择正确的动词填空。,Can,Dont,haveto,Do,1.Wehavetostayathome.(改为一般疑问句)_you_tostayathome?2.Bobhastogethomebeforenineoclock.(改为否定句)Bob_gethomebeforenineoclock.,四、句型转换,Do,have,doesnt,have,to,3.Wecanwearourownclothes.(改为一般疑问句,并作否定回答)_you_yourownclo