人教版 七年級(jí)英語下冊(cè) Unit4 Section A Grammar focus-Section B 1a-1d 課件 (共40張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:祈使句是怎樣構(gòu)成的？一般在什么情況下會(huì)用祈使句？Don’t…不要做……祈使句一般用來表示請(qǐng)求、命令、勸說、號(hào)召、警告等。在祈使句中,通常省略第二人稱主語you?？隙ㄊ揭詣?dòng)詞原形開頭，否定式一般在動(dòng)詞原形前加don’t。祈使句一、祈使句的肯定式1.以行為動(dòng)詞原形開頭，簡(jiǎn)稱Do型。

e.g.Comehere.到這兒來。2.以動(dòng)詞be開頭，簡(jiǎn)稱Be型。e.g.Bequiet,please.請(qǐng)安靜。3.以Let開頭，簡(jiǎn)稱Let型。e.g.Let’splaybasketball!咱們打籃球吧!

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.不要討論。

Don’tbelate.別遲到。2.以let開頭的祈使句，其否定式有兩種：一種是直接在句首加don’t，另一種是“l(fā)et+賓語+not+動(dòng)詞原形+(其他)”。e.g.Don’tlethimgo.不要讓他走。Let’snotgothere.咱們別去那兒。注意：“No+名詞/動(dòng)詞?ing形式”表示禁止或規(guī)勸，常用于公共場(chǎng)所。e.g.Nophotos!禁止拍照！

Nosmoking！

禁止吸煙！【運(yùn)用】將下列句子翻譯成英語。1.請(qǐng)看這幅圖畫。2.不要在教室里跑。3.讓我們幫助他。Don’trunintheclassroom.Let’shelphim.Pleaselookatthepicture./Lookatthepicture,please.4.在圖書館保持安靜。5.上課不要遲到。Bequietinthelibrary.Don’tbelateforclass.ObserveandlearnHaveathink:1.情態(tài)動(dòng)詞在用法上有什么共同點(diǎn)？2.can在本單元主要表示什么含義？它還可表達(dá)什么意思？3.haveto在用法上與其他情態(tài)動(dòng)詞有何區(qū)別？情態(tài)動(dòng)詞can,must,haveto后面都接動(dòng)詞原形本單元can意為“可以”，表示請(qǐng)求、允許。如:I

can

dance

and

sing.2)can還可表示能力,“能，會(huì)”。如:--Can

the

students

run

in

the

hallways?

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

情態(tài)動(dòng)詞can語法歸納鞏固提升情態(tài)動(dòng)詞must表說話人的主觀看法，表示必須、必要。句型結(jié)構(gòu)：主語+must+動(dòng)詞原形+其他.如:Youmustcomeintime.你必須按時(shí)來。

Thechildrenmustbebackbefore6o’clock.孩子們必須6點(diǎn)前回來。情態(tài)動(dòng)詞musthaveto表示必須,強(qiáng)調(diào)客觀需要,有不得不、被逼無奈做某事的意思。此詞既有人稱、單復(fù)數(shù)的變化,也有動(dòng)詞時(shí)態(tài)的變化。其否定形式和疑問句形式均需要借助助動(dòng)詞do才可以進(jìn)行變化。情態(tài)動(dòng)詞havetohaveto的句型結(jié)構(gòu):肯定句：主語＋have/has/had

to＋V原形＋其他.否定句：主語+don’t/doesn’t/didn’t

have

to＋V原形＋其他.疑問句:Do/Does/Did＋主語＋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小組合作拓展延伸Wedon’thavetowearschooluniforms…Wedon’thavetodohomeworkeveryday…Eachfamilyalsohasitsownrules.Canyoutelltherulesinyourfamily?FAMILYRULESI_______helpmymom_______________everymorning.makebreakfasthavetoLookandsayFAMILYRULESI______domyhomework____________.afterschoolmustFAMILYRULES______watchTVlateatnight.Don’tFAMILYRULES______goout__________.Don’tatnightLookatthepicturesanddescribethem.Whatcanyouseeineachpicture?Matchthepictures[a-h]withtherules.1a聽說結(jié)合句型操練___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練習(xí)吉他

practicev.

意為“練習(xí)”后面可跟名詞、代詞或動(dòng)詞-ing形式。

e.g.ImustpracticeEnglisheverymorning.

我每天早晨必須練習(xí)英語。

TompracticesspeakingEnglisheveryday.Tom每天練習(xí)講英語。practiceLanguagePointsI.根據(jù)句意，從方框中選擇恰當(dāng)?shù)膯卧~填空，有的需要變換形式。

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

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