Unit+4+Section+A+Grammar+focus-3c+課件【高效備課精研+知識(shí)精講提升】 人教版七年級(jí)英語(yǔ)下冊(cè)

SectionAGrammarfocus-3cDon’teatinclassUnit4RevisionCanwe......?Lead-inLibrary

RulesWe____________bequiet.We______eat.______listentomusic.______run....

must/havetocan’tDon’tDon’tLet'sobserveandthink.4.Wealsohavetobequietinthelibrary.1.Don’tbelateforclass.3.Wecan'tbringmusicplayerstoschool.5.Wealwayshavetoweartheschooluniform.2.Wemustbeontime.dosdon'ts1.Don’tbelateforclass.2.Wemustbeontime.3.Wecan'tbringmusicplayerstoschool.4.Wealsohavetobequietinthelibrary.5.Wealwayshavetoweartheschooluniform.Whatcanyoufindinthesephrases?Don’tturnrightDon’tparkDon’tgofishingKeepquiteDon’tfightGrammarFocusDon’truninthehallways.Don’tfight.Whataretherules?Wemustbeontimeforclass.Canweeatintheclassroom?No,wecan’t,butwecaneatinthedininghall.Canwewearahatinclass?Yes,wecan./No,wecan’t.Doeshehavetowearauniformatschool?Yes,hedoes./No,hedoesn’t.Whatdoyouhavetodo?Wehavetobequietinthe

library.Observeandlearn.Don’teatintheclassroom.Don’t

fight.Don’t

runinthehallways.Don’tarrivelateforclass.Don’t

listentomusicinclass.Haveathink: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(lái)表示請(qǐng)求、命令、勸說(shuō)、號(hào)召、警告等。在祈使句中，通常省略主語(yǔ)you，其肯定形式以動(dòng)詞原形開(kāi)頭，否定形式是在動(dòng)詞原形前加don’t。祈使句句尾用句號(hào)或感嘆號(hào)，讀時(shí)用降調(diào)。為表示禮貌，可以在句首或句尾加上please。句末用please時(shí)，前面通常加逗號(hào)。祈使句

LanguagepointsDon’truninthehallways.Wecaneatinthedininghall.Wemustbeontimeforclass.Wehavetobequietinthelibrary.The

expression

of

rules:祈使句canmusthaveto祈使句的形式(1)let開(kāi)頭的祈使句的肯定句：Let+sb.+v.（原形）例:讓我們幫助你。Don’tletthemcomein.Letushelpyou.否定為：Don’t+let+第三人稱代詞+v.（原形）例:不要讓他們進(jìn)來(lái)。

Languagepoints祈使句的形式Do

型肯定句：動(dòng)詞原形（+賓語(yǔ)）+其他.請(qǐng)坐。否定句：Don’t+動(dòng)詞原形（+賓語(yǔ)）+其他.不要在這兒跑。Sitdown,please.Don’trunhere.否定句Don’t+行為動(dòng)詞+其他.Don’t+be+其他.No+n./v.-ing.例:Don’tplaycomputergames.例:Don’tbelateagain.例:Nophotos.Noswimming.不要玩電腦游戲。不要再遲到。不許拍照。不許游泳。LanguagepointsBe

型肯定句：Be+表語(yǔ)+其他.請(qǐng)安靜。否定句：Don’t+be+表語(yǔ)+其他.不要吵鬧。Bequiet,please.Don’tbenoisy.祈使句的形式Languagepoints情態(tài)動(dòng)詞can1.表示能力：“會(huì)，可以，能，能夠”2.不能單獨(dú)作謂語(yǔ)，后必須接動(dòng)詞原形一起構(gòu)成謂語(yǔ)3.沒(méi)有人稱的數(shù)的變化4.否定形式加not:cannot,cannot,或縮寫(xiě)can't疑問(wèn)句can提前。

例：Ican'tplaythegutar.

Canweeatintheclassroom?情態(tài)動(dòng)詞must與haveto1.情態(tài)動(dòng)詞must的用法(1)意為“必須”，表示主觀的義務(wù)或必要，無(wú)人稱、數(shù)和時(shí)態(tài)的變化。以must開(kāi)頭的一般疑問(wèn)句，肯定回答一般用must，否定回答一般用needn’t或don’t/doesn’thaveto，意為“不必”，不用mustn’t；mustn’t

常用于否定句中，表示“不允許；禁止”。(2)意為“一定；準(zhǔn)是”，表示肯定推測(cè)，用于肯定句中。這本書(shū)一定是瑪麗的。

ThebookmustbeMary’s.Languagepoints情態(tài)動(dòng)詞情態(tài)動(dòng)詞must與haveto在回答must引起的問(wèn)句時(shí)，如果是否定的答復(fù)，可用don’thaveto或needn’t(不必),但不能用mustn’t(一定不,必須不,不允許,不得)

如：Youmustn'tdriveveryfastneartheschool.haveto的否定形式為nothaveto，相當(dāng)于needn’t，意為“不必”如：Shedoesn'tneedtocleanitnow.祈使句定義：表示請(qǐng)求、命令、建議、警告等語(yǔ)氣的句子，通常省略主語(yǔ)（第二人稱）形式：1.肯定句Do型V.原型+其他Standup!Sitdown!Be型Be+其他Bequiet!Beagoodstudent.2.否定句Do型句首+Don'tDon'ttalk.Be型Don'tbelateforclass.注意：表否定，禁止有些可用No+n./doing.Notalking.Nodrinking.Nofire.注意：有時(shí)可在祈使句的句首或句尾加上please，使語(yǔ)氣顯得客氣、有禮貌。如果在句尾加please，應(yīng)該用逗號(hào)與前句隔開(kāi)。e.g.Sitdown,please.請(qǐng)這邊走。練習(xí)：1.Don't________(think)toomuch.2.Tom________(play)basketballwithyourbrother.3.Tom,________(play)basketballwithyourbrother.4.__________(notrun)intheclassroomplease.5._____(be)careful.6.No__________(sing).7.No_______(food).thinkplaysplayDon'trunBesingingfoodmust和haveto同：都可以表示“必須”異：1.must表示主觀的意愿，haveto強(qiáng)調(diào)客觀的必要性，意為“不得不”Teacher,Imustgohomenow.(周六放學(xué)回家）Mom,Ihavetogotoschoolnow.(周天返校）2.must沒(méi)有人稱和數(shù)的變化，而haveto有人稱和數(shù)的變化I/He/She/Theymustworkeveryday.I/We/They/Youhavetoworkeveryday.

He/She/Bob

hastoworkeveryday.3.兩者的否定形式大不相同mustn't表示“禁止，不準(zhǔn)”don'thaveto表示“不必”Youmustn'tswimintheriver.（你不準(zhǔn)在河里游泳）Youdon'thavetogetupearly.（你不必早起）3aWritetherulesfortheschoollibrary.

LibraryRules1.______________________________2.______________________________3.______________________________4.______________________________Don’ttalk.1234Don’teatinthelibrary.

Don’tlistentomusicinthelibrary.Don’ttakephotosinthelibrary.Tips1.由圖示可知都是一些禁止類的祈使句。2.可知應(yīng)用“Don’t+動(dòng)詞原形”句子。Usethewordstomakequestionsabouttherules.Thenwriteanswersaccordingtoyourschool.Bequiet?(she/haveto/inthelibrary)Q:Doesshehavetobequietinthelibrary?A:Yes,shedoes.

2.Eat?(he/haveto/inthedinninghall)Q:_________________________________________A:_________________________________________Doeshehavetoeatinthedininghall?Yes,hedoes.3bTips1.觀察疑問(wèn)句，提出助動(dòng)詞、情態(tài)動(dòng)詞。2.第二位提出主語(yǔ)+動(dòng)詞，剩下按常規(guī)寫(xiě)完。3.Listentomusic?(we/can/inthedininghall)Q:_________________________________________A:_________________________________________4.Wearahat?(we/can/intheclassroom)Q:_________________________________________A:_________________________________________Canwelistentomusicinthedininghall?No,youcan’t.Canwewearahatintheclassroom?No,youcan’t./Yes,youcan.MydreamschoolThedreamschoolrules:Wedon’thavetowearuniformseveryday..Wecanchoosethesubjectswewant.…3cMakeupfivecoolrulesforyourdreamschool.Shareyourruleswiththeclass.YourclassmatesvotefortheCoolestSchool!1.Wecaneatinclass.2.Wedon’thavetocometoschooleveryday.3.…Atmydreamschool,wedon’thavetocometoschooleveryday.We…Atmydreamschool,wedon’thavetocometoschooleveryday.Wecaneatinclass.We…(be)ontime

準(zhǔn)時(shí),listentomusic

聽(tīng)音樂(lè)inthehallways

在走廊里inthedininghall

在餐廳里inclass

上課；聽(tīng)課；在課堂上alotof

許多；大量,haveto

必須；不得不musicplayers

音樂(lè)播放器weartheschooluniform

穿校服dreamschool

夢(mèng)想中的學(xué)校Bequiet.

安靜。Don’tbelateforclass.

上課不許遲到。ExercisesⅠ.

根據(jù)語(yǔ)境從方框中選擇恰當(dāng)?shù)膯卧~填空。1.IlikeLucy.Sheisa(n)_________girl.

2.It’svery_________forallofustobehealthy.3.Tinais_________.Pleaseaskhertocomein.4.Jackie_________awhiteT-shirt.Helooksverycool.5.—Tony,please_________yourviolintoschoolthisafternoon.

—OK,Iwill.quietoutside,wear,important,bring,quietimportantoutsidewearsbringⅡ.

根據(jù)句意及提示完成下列句子。1.In

Beijing,Mr.Greenhas____________(許多)friends.2.Where’smy_____________(校服),Mom?3