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ImperativeSentenceWhatcanwedoatschoolorintheclassroom?Whatcan’twedo?Howtobeagoodstudent?Don'teatinclass.Don'tarrivelateforclassDon'tsleepinclass.Don'tdrawonthewall.Don'ttalk.Don'tplaysportsintheclassroom.Don'tfight.Don'tlistentomusicinclass.schoolrules祈使句是表示请求、命令、建议或劝告等的句子。一.祈使句的概念ImperativeSentence二.祈使句的特点Wecleantheclassroomeveryday.Heusuallygoestothelibraryonweekends.2.谓语动词一律用原形。1.主语通常为you,但常省略。3.句末根据语气的强弱用感叹号或句号。Don'tarrivelateforclass.Sitdown,please!Ms.ChensaysCleantheblackboard.Standup!Sitdown,please!Pleaseopenthedoor.TurntoPage21.Listentomecarefully.Game:Isay,youdoReadandobserve(观察)Cleantheblackboard.Standup!Listentomecarefully.TurntoPage21.Sitdown,please!Pleaseopenthedoor.Don'tbelateforclass.Don'teatintheclassroom.Don'truninthehallways.Don'tfight.Don'tsleepinclass.Don'twearahatinclass.Drawtheconclusion(得出结论)祈使句的结构如下：(Please)+Dosth.(Please)+Don’tdosth.肯定：否定：注意：有时可在祈使句的句首或句尾加上please，使语气显得客气、有礼貌。如果在句尾加please，应该用逗号与前句隔开。e.g.Gothisway,please.请这边走。Pleasegothisway.三.祈使句的形式1.祈使句的肯定式(1).以行为动词原形开头，简称Do型。e.g.Comehere.(2).以动词be开头，简称Be型。e.g.Bequiet,please.Bekindtoyourclassmates.(3).以Let开头，简称Let型。e.g.Let’sgo!Let'splaybasketballafterschool.“三姐妹”Turnright!Turnleft!Bequiet.Goupstairs！Godownstairs!signs2.祈使句的否定式(1).Do型和Be型的否定式是在句首加don’t。e.g.Don’tsithere.不要坐在这儿。Don’tbelate.别迟到。(2).以let开头的祈使句，其否定式有两种：一种是直接在句首加don’t，另一种是“let+宾语+not+动词原形+(其他)”。e.g.Don’tlethimgo.不要让他走。Let’snotgothere.咱们别去那儿。“三兄弟”注意：(3)“No+名词/动词-ing形式”表示禁止或规劝，常用于公共场所。e.g.Nophotos!禁止拍照！Noswimming！禁止游泳！GuessingGameDon’tparkyourcar.Don’tsmoke!Noparking!Nosmoking!GuessingGameDon’ttakephotos!Don’tswimhere!Nophotos!Noswimming!LibraryRules1.Don’ttalk.2.________________3.________________4.________________Writetherulesfortheschoollibrary.Don’tlistentomusic.Don’teatordrink.Don’ttakephotos.方法指导：1.由图示可知都是一些禁止类的祈使句。2.可知应用祈使句的否定形式。Task1:Ifyouaretheheadteacher(班主任),discussandmakerulesforourclass.Seewhichgroupcansaythemostclassrules.RulesofClass111._______________2._______________3._______________4.________________5.________________...Task2RulesofCass111.___________________________________2.___________________________________3.___________________________________4.___________________________________5.___________________________________...Don'tbelateforclass.Don’teatordrinkintheclassroom.Don’truninthehallways.Wearschooluniformsonschooldays.Cleantheclassroomeveryday.祈使句的用法主语是you常省去，动词原形开头记。否定形式要注意，句首要把don’t加。要讲客气用please，句首、句末没关系。SummaryBeagoodstudent.祈使句句式肯定形式否定形式Do型：动词原形+其他Openthedoor.Don’topenthedoor.Let型：let+宾语+动词原形+其他Let'sgothere.1.Don’tlet'sgothere.2.Let'snotgothere.Be型：Be+表语Bequiet！Don’tbelateforclass.No型：No+名词∕动名词Nophotos!Nosmoking!HomeworkTrytowritedownatleastfivesentencesaboutyourfamilyrules.1.Don’twaste(浪费)water.7.Don’treadinbed.2.Makethebedeveryday.3.Washyourhandsbeforemeals.4.Turnoffthelightsbeforeyouleavetheroom.5.Don’treadoreatatthesametime.6.Don'ttalkloudlyonthephone.