Unit4Don'teatinclass.学习目标:1、重点学习用祈使句的肯定句和否定句表达规则:Stoptalking,please.Bequick!Let'scleanthebedroomontime.Don'truninthehallways.Don'tlistentomusicintheclassroom.2、重点掌握haveto与must的用法。Whatcan/can’twedotobeagoodstudent?Canwe…?Yes,youcan.No,youcan’t.()dohomeworkintheclassroom()playcomputergameseveryday()listentotheteachersinclass(在课堂上)()runinthehallways()readEnglishbooksinEnglishclass()wearhatsinclass()listentomusicintheclassroom()arriveontimeforclass()drawonthewall()eatinthedininghall()fight…√√××××√×√×√Canwefight?No,wecan’t.So,don’tfight!Pairwork:A:Canwe…?B:No,wecan’t./Yes,wecan.B:So,don’t….Activity1.____listentomusicinthehallways.cancan’t2.____eatintheclassroomcancan’t3.____wearahatinclasscancan’t4.____arrivelateforclasscancan’t5._____fightcancan’t6.____wearauniformatschoolcancan’t7.____eatinthedinningroomcancan’t8.____eatoutside9.____runinthehallwayscancancan’tcan’t√√√√√√√√√全方位透视“祈使句”类型祈使句是用来表示请求、命令、建议的句子,它的特点是以动词原形开始,句末用”!”或”.”朗读时常用降调。祈使句的主语you通常不表示出来,但如果要特别强调对方或表达某种情绪时可以有主语或呼语。如:Comein,everybody!大家都进来吧!1.Do型:实义动词原形+其它,(please).常表示客气的请求,有时please也放在句尾,其前加逗号如:请坐Sitdown.请进Pleasecomein.=Comein,please.2.Be型:Be+表语(名词或形容词)+其他.如:做个好学生。_____agoodstudent.安静!____________!BeBequiet!3.Let型:Let+代词宾格+动词原形+其他常表示请求和建议。如:让我来读吧__________readit.咱们练习吉他吧______practicetheguitar!4.Don’t型:Don’t+动词原形+其他是否定的祈使句,表示告诉某人不要做某事。如:不要和他打架。___________withhim.不要吵闹。__________noisy.LetmeLet'sDon’tfightDon’tbeDon’twalk.Walk.Ridehorses._____ridehorses.Don‘t想想你能行Run._____run.Don’t_____right.__________right.TurnDon’tturn这次你更能行5.No型:No+名词或动名词+其他这种否定的祈使句多用于公共警示语。如:禁止拍照!________________!禁止游泳!___________________!练一练:改正下列句子中的错误1.Notdothedishes.2.Benotangrywithme.3.Don’tpleaselookatme.4.Letmetohelpyou.5.Don’tlateforschool.6.Noswim!7.Let’sgoodfriends!8.Eatpleaseinthedininghall.NophotosNoswimming注:letus与let’s的区别(1)letusdosth.让(或允许)我们做某事;即提出请求,请对方允许,而对方不做,只有我们做。如:Letusgoout.让我们出去吧(2)let’sdosth.咱们去做某事吧;即提出建议,希望对方一同做某事。如:Let'sfollowtherules.让咱们遵守规则吧.。must与haveto在英语中,must与haveto都可以表示“必须”,但其用法有所不同。(1)must表示说话人的主观看法,认为有义务有必要。如:我们必须学会游泳。(是我们要这样做的)We____________________________.(2)haveto表示客观需要,即周围的环境、习惯、协约等要求某人“不得不作某事”。如:我们不得不记住规则。(环境使我们不得不这样)We___________________________________.(3)must的否定形式为_________,haveto的否定形式为_______________,两者意义也不同。前者表示“不应该”、"不许可”、“禁止”等,后者表示“不必要”。mustlearntoswimhavetoremembertherulesmustn'tdon'thaveto如:你们不能在马路上踢足球。You_______playfootballontheroad.你今天不必练钢琴了。You______________practicethepianotoday.(4)haveto的相应形式。如:他不得不每天按时读书。He__________read_________everyday.他不必每天早早起床。He_________________getupearlyeveryday.mustn'tdon'thavetohastoontimedoesn'thavetoDoyouhaveto…?Yes,wedo.Wehaveto…No,wedon’t.Wedon’thav...