人教版 七年级英语下册 Unit4 Section A Grammar focus-Section B 1a-1d 课件 (共40张PPT)

Unit4Don'teatinclass.Period2SectionAGrammarfocus--SectionB1a-1d1.TolearnImperativesDon’t…:Don’truninthehallways.2.Tolearntousecanforpermission:Canweeatintheclassroom?3.Tolearntousemodalverbshaveto&must:Wehavetobequietinthelibrary.Wemustbeontimeforclass.ObjectivesObserveandLearnDon’teatintheclassroom.Don’t

fight.Don’t

runinthehallways.Don’tarrivelateforclass.Don’t

listentomusicinclass.Questions:祈使句是怎样构成的？一般在什么情况下会用祈使句？Don’t…不要做……祈使句一般用来表示请求、命令、劝说、号召、警告等。在祈使句中,通常省略第二人称主语you。肯定式以动词原形开头，否定式一般在动词原形前加don’t。祈使句一、祈使句的肯定式1.以行为动词原形开头，简称Do型。

e.g.Comehere.到这儿来。2.以动词be开头，简称Be型。e.g.Bequiet,please.请安静。3.以Let开头，简称Let型。e.g.Let’splaybasketball!咱们打篮球吧!

二、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’ttalk.不要讨论。

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。注意：“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！

Nosmoking！

禁止吸烟！【运用】将下列句子翻译成英语。1.请看这幅图画。2.不要在教室里跑。3.让我们帮助他。Don’trunintheclassroom.Let’shelphim.Pleaselookatthepicture./Lookatthepicture,please.4.在图书馆保持安静。5.上课不要迟到。Bequietinthelibrary.Don’tbelateforclass.ObserveandlearnHaveathink:1.情态动词在用法上有什么共同点？2.can在本单元主要表示什么含义？它还可表达什么意思？3.haveto在用法上与其他情态动词有何区别？情态动词can,must,haveto后面都接动词原形本单元can意为“可以”，表示请求、允许。如:I

can

dance

and

sing.2)can还可表示能力,“能，会”。如:--Can

the

students

run

in

the

hallways?

--Yes,theycan./No,theycan’t.Wecan’teatintheclassroom.

情态动词can语法归纳巩固提升情态动词must表说话人的主观看法，表示必须、必要。句型结构：主语+must+动词原形+其他.如:Youmustcomeintime.你必须按时来。

Thechildrenmustbebackbefore6o’clock.孩子们必须6点前回来。情态动词musthaveto表示必须,强调客观需要,有不得不、被逼无奈做某事的意思。此词既有人称、单复数的变化,也有动词时态的变化。其否定形式和疑问句形式均需要借助助动词do才可以进行变化。情态动词havetohaveto的句型结构:肯定句：主语＋have/has/had

to＋V原形＋其他.否定句：主语+don’t/doesn’t/didn’t

have

to＋V原形＋其他.疑问句:Do/Does/Did＋主语＋have

to＋V原形＋其他?如:Shehastolookafterhermotherathome.Wedon’thavetocleantheroomtoday.--Doeshehavetogotobednow?--Yes,hedoes.//No,hedoesn’t.LibraryRulesDon’ttalk.________________________________________________Writetherulesfortheschoollibrary.Don’tlistentomusic.Don’teatordrink.Don’ttakephotos.3aBequiet?(she/haveto/inthelibrary)Q:Doesshehavetobequietinthelibrary?A:Yes,shedoes.

Usethewordstomakequestionsabouttherules.Thenwriteanswersaccordingtoyourschool.3b2.Eat?(he/haveto/inthedininghall)Q:________________________________?A:_____________3.Listentomusic?(we/can/inthehallways)Q:________________________________?A:_____________4.Wearahat?(we/can/intheclassroom)Q:_____________________________?A:____________Yes,hedoes.DoeshehavetoeatinthedininghallCanwelistentomusicinthehallwaysNo,wecan’t.CanwewearahatintheclassroomNo,wecan’t.Atmydreamschool,wedon’thavetocometoschooleveryday…Wecaneatinclass…Makeupfivecoolrulesforyourdreamschool.Shareyourruleswiththeclass.YourclassmatesvotefortheCoolestSchool!3c小组合作拓展延伸Wedon’thavetowearschooluniforms…Wedon’thavetodohomeworkeveryday…Eachfamilyalsohasitsownrules.Canyoutelltherulesinyourfamily?FAMILYRULESI_______helpmymom_______________everymorning.makebreakfasthavetoLookandsayFAMILYRULESI______domyhomework____________.afterschoolmustFAMILYRULES______watchTVlateatnight.Don’tFAMILYRULES______goout__________.Don’tatnightLookatthepicturesanddescribethem.Whatcanyouseeineachpicture?Matchthepictures[a-h]withtherules.1a听说结合句型操练___goout___seefriends___dohishomework___practicetheguitar___dothedishes___watchTV___helphismommakebreakfast___cleanhisroomahcbegfdListenandputanx

forthingsDavecan’tdoanda√forthingshehastodo.RulesCan’tHaveto/mustgooutseefriendsdohishomeworkpracticetheguitardothedisheswatchTVhelphismommakebreakfastcleanhisroom√√√√xxx√1bListenagain.WritewhenDavehastofollowtherulesinthechartin1b.Choosefromthephrasesinthebox.onschoolnightsonschooldayseverySaturdayafterdinnerbeforedinnerafterschoolintheeveningeverymorning1c

RulesWhengooutseefriendsdohishomeworkpracticetheguitardothedisheswatchTVhelphismommakebreakfastcleanhisroomafterschoolbeforedinnerafterdinnereverymorningonschoolnightsonschooldaysintheeveningeverySaturdayTalkabouttherulesinDave’shouseingroups.TalkingHecan’tgooutonschoolnights.

Hecan’tseehisfriendsonschooldays.Hecan’twatchTVintheevening.1dHehastodohishomeworkafterschool.Hemustpracticetheguitarbeforedinner.HemustcleanhisroomeverySaturday.Hehastohelphismommakebreakfasteverymorning.Davecan’tgooutonschoolnights.Hecan’tseehisfriendsonschooldays.Hehastodohishomeworkafterschool.

Hemustpracticetheguitarbeforedinner.Hecan’twatchTVintheevening.Hehastohelphismommakebreakfasteverymorning.HemustcleanhisroomeverySaturday.ReportCanyoutelltherulesinotherplaces?Discussthemwithyourgroupmembers.librarydiningroomdormitory_________theguitar练习吉他

practicev.

意为“练习”后面可跟名词、代词或动词-ing形式。

e.g.ImustpracticeEnglisheverymorning.

我每天早晨必须练习英语。

TompracticesspeakingEnglisheveryday.Tom每天练习讲英语。practiceLanguagePointsI.根据句意，从方框中选择恰当的单词填空，有的需要变换形式。

dish,before,practice,out1.David________playingtheguitareverySunday.2.________Ileavehome,Ihavetomakebreakfastformyson.

3.Bob,helpmewashthese________inthekitchen.4.Charlottewenttothewindow(窗户)a