Unit2SectionGrammarFocus课件人教版英语七年级下册

Unit2

Norules,NoorderSectionAGrammarDon'tletthemin,Don'tletthemseeBe

thegoodgirlyoualwayshavetobeConceal,don't

feel,Don't

letthemknowWell,nowtheyknowLet

itgo,letitgoCan'tholditbackanymoreLet

itgo,letitgoTurn

awayandslamthedoorIdon'tcarewhatthey'regoingtosayLet

thestormrageonThecoldneverbotheredmeanywayWatchandsingDon'tletthemin,Don'tletthemseeDon't

letthemknowTurn

awayandslamthedoorLet

itgo,letitgoLet

itgo,letitgoBe

thegoodgirlyoualwayshavetobeWhatkindofsentencesarethey?Do型Be型Let型Watchandthink祈使句

(Imperativesentences)Walkinthehallway.Don’trun!Bepoliteandtreatoneanotherwithrespect.Don’tlitter./Youmustn’tlitter./Youcan’tlitter.Canwebringourphonestoclass?No,wecan’t.Wemustkeeptheminourlockers.Canweeatsnacksinclass?No,wecan’teatinclass.Wehavetoeatinthedininghall.Readthesentences.Dotheverbsinboldneedtochangeforms?Why?3aImperativeSentences1.什么是祈使句？祈使句一般用来表示命令、请求、劝说、号召、警告、禁止等。ImperativeSentences2.祈使句的特点？通常省略主语you其肯定形式常以动词原形开头，否定形式是在动词原形前加don’t。更礼貌，前面或后面加pleaseImperativeSentences3.祈使句的类型？肯定式Turnback!Gotobednow!Do型：动词原形+其他Bequiet,please!Becareful!Be型：Be+其他Let’sgo!Let’shavearest!Let型：Letsbdo+其他ImperativeSentences3.祈使句的类型？否定式Don’tbelate!Don’tsmokehere!Don’tlethimleave!Don’t型

Don’tbe+其他Don’tdo+其他Don’tlet+其他Nophotos!Nosmoking!No型

No+n.No+v.ingImperativeSentencesSummary

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，通常省略主语you，其肯定形式以动词原形开头，否定形式是在动词原形前加don’t。祈使句句尾用句号或感叹号，读时用降调。为表示礼貌，可以在句首或句尾加上please。句末用please时，前面通常加逗号。Let’spracticeDon’tbe1.It’sanimportantmeeting.

(not,be)late.2.

(not,make)anynoise!Yourmotherissleeping.3.

(not,talk)and

(read)aloud.4.Thenoticeonthewallsays“

”.(nosmoke)5.

(look)out!Acariscoming.6.

(not,let)thebabycry.7.Let’s

(notsay)anythingaboutit.Don’ttalkDon’tmakereadNosmokingLookDon’tletnotsayWalkinthehallway.Don’trun!Bepoliteandtreatoneanotherwithrespect.Don’tlitter./Youmustn’tlitter./Youcan’tlitter.Canwebringourphonestoclass?No,wecan’t.Wemustkeeptheminourlockers.Canweeatsnacksinclass?No,wecan’teatinclass.Wehavetoeatinthedininghall.Readthesentences.Dotheverbsinboldneedtochangeforms?Why?3a1情态动词没有除了have

to之外，其余没有人称和数的变化2情态动词后跟动词原形特点情态动词ModalVerbs情态动词用于表达说话人的态度、意愿、推测、建议、能力、义务等。一、情态动词can的用法Canwebringourphonestoclass?No,wecan’t.Wemustkeeptheminourlockers.can可表示能力、许可、请求等。其否定形式为can’t/cannot。1.表示能力，意为“能，会”。Thetwinscandraw,buttheycan’tswim.2.表示许可，意为“可以”。Youcan’tswimintheriver.3.表示请求，意为“可以”。CanIborrowyoureraser?Yes,youcan.

情态动词haveto和must的用法No,wecan’t.Wemustkeeptheminourlockers.No,wecan’teatinclass.Wehavetoeatinthedininghall.haveto①常强调客观需要,多译为“不得不”；②有时态、人称和数的变化，其一般现在时的第三人称单数形式为hasto，过去式为hadto。haveto的否定形式为don’thaveto，表示“不必”。must①常表示说话人的主观看法，多译为“必须”；②没有时态、人称和数的变化。must的否定形式为mustn’t，表示“禁止，不准”。Payattention!MustIdothedishesnow?Yes,youmust.No,youneedn’t.No,youdon’thaveto.Must开头的一般疑问句肯定回答用must否定回答用needn’t或don’thaveto.PresentationModalverbs情态动词Readandsummarize:Lookandlearnmusthaveto表达意义人称,数和时态否定形式123havetoSummarymust客观需要,“不得不”说话者的主观意愿,认为有必要或者有义务去做某事有人称,数和时态的变化,第三人称单数形式为hasto无人称,数和时态的变化don’t/doesn’thaveto“不必”mustn’t禁止“不要;不许”1.Don’tjumpthequeue.You______________waityourturn.2.I_____feed

mydogmanykindsoffood,butI______givehimchocolate.Itisbadforhim!3.A:CanIleavetheclassroomifIdon’tfeelwell?B:Yes,butyou_______________tellyourteacheraboutitwhenyou______beabsentfromclass.Completethesentencesusingcan,haveto/must,orcan’t/mustn’t.haveto/mustcanhaveto/musthavetocan’t3bjumpthequeue插队waityourturn等待你的顺序feedmydog喂狗leave离开bebadfor...对。。。有坏处tellsb.aboutsth.告诉某人关于某事tellsb.todosth.告诉某人做某事e.g.Hetellsme____

(wait)myturn.beabsentfrom...缺席...4.A:Hey!CanIlookatyourbook?B:Shh,we___________

talkquietlyinthelibrary.5.A:Canyouputonyour

seatbelt?We___________wearonewhenwe’reinacar.B:Sure.Thanks!haveto/musthaveto/mustlookat看puton穿上、系上talkquietly小声说话seatbelt安全带wear穿着，强调状态puton穿上，强调动作—Amy,___________talkingnow.Wearehavingaclass!—Sorry,Iwon’t.A.tostop B.stop C.stops D.stopping2LetKen________youhisnewtimetable.A.show B.shows C.toshow D.showing3—________eatanythinginclass,Mike.—Oh,I’msorry.A.Can’t B.Not C.Doesn’t D.Don’t1Multiplechoice.1.Letme_____(tell)youaboutmyfamily.2.___________(notlisten)tomusicinclass.3.Doyouhaveto______(wear)schooluniformseveryday?4.Youcan’teatintheclassroom.Youcan_____(eat)inthedininghall.5.Youmust_____(be)quietinthelibrary.6.No___________(swim)intheriver!Itistoodangerous