人教 七年级 英语 下册《Unit2 SectionA Grammar Focus》课件

SectionAGrammarFocusUnit2NoRules,NoOrder能够通过观察和分析示例句子，深入理解并准确辨析祈使句和情态动词的表意功能能够熟练运用祈使句和情态动词谈论规则课时教学目标Let’senjoyavideo!Doyouknowtherules？Lead-in新课讲授3aReadthesentences.Andtrytotranslatethem.在

祈使句中

和

情态动词后，动词均用原形。Walkinthehallway.Don’trun!Bepoliteandtreat

oneanotherwithrespect.Don’tlitter./Youmustn’tlitter./Youcan’tlitter.Canwe

bringourphonestoclass?No,wecan’t.Wemustkeeptheminourlockers.Canweeat

snacksinclass?No,wecan’teatinclass.Wehaveto

eatinthedininghall.祈使句中情态动词后Dotheverbsinboldneedtochangeforms?Why?ImperativeSentences(祈使句)Walkinthehallway.Don’trun!Bepoliteandtreat

oneanotherwithrespect.Don’tlitter./Youmustn’tlitter./Youcan’tlitter.祈使句一般用来表示命令、请求、劝说、号召、警告、禁止等。1.什么是祈使句？Walkinthehallway.Don’trun!Bepoliteandtreat

oneanotherwithrespect.Don’tlitter./Youmustn’tlitter./Youcan’tlitter.1.通常省略主语you。2.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。3.祈使句句尾用句号或感叹号。2.祈使句的特点？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3.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.ing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，其肯定形式常以动词原形开头，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，可以在句首或句末加上please。句末用please时，前面通常加逗号。SummaryModalVerbs(情态动词)Walkinthehallway.Don’trun!Bepoliteandtreat

oneanotherwithrespect.Don’tlitter./Youmustn’tlitter./Youcan’tlitter.Canwe

bringourphonestoclass?No,wecan’t.Wemustkeeptheminourlockers.Canweeat

snacksinclass?No,wecan’teatinclass.Wehaveto

eatinthedininghall.1.出现了哪些情态动词？can,must,haveto含义：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。没有人称和数的变化；

后面必须跟动词原形来构成完整的谓语。2.情态动词的含义?情态动词can的用法can可表示能力、许可、请求等。其否定形式为can’t/cannot.eg.IcanspeakalittleFrench.我会说一点法语。（能力）Wecan’truninthehallways.我们不能在走廊上奔跑。（许可）Canyouhelpme?你能帮助我吗？（请求）3.情态动词的用法?情态动词must的用法常表示说话人的主观看法，多译为“必须”；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”。eg.MustIfinishmyhomeworkbeforeeighto’clock?Yes,youmust.No,youmustn’t.No,youneedn’t.No,youdon’thaveto.mustn’t表示禁止：不许情态动词haveto的用法haveto表示不得不。常强调客观需要。有时态、人称和数的变化，其否定形式为don’thaveto。1.肯定句：主语+_____________+___________.2.

否定句：主语+_____________haveto+__________.3.

一般疑问句：__________+主语+haveto+__________?

回答：Yes,主语+_________./No,主语+____________.do/doesdon’t/doesn’thave/hasto动词原形动词原形动词原形Do/Doesdon’t/doesn’t3bCompletethesentencesusingcan,haveto/must,orcan’t/mustn’t.1.Don’tjumpthequeue.You______________waityourturn.2.I_____feedmydogmanykindsoffood,butI_______givehimchocolate.Itisbadforhim!3.A:CanIleavetheclassroomifIdon’tfeelwell?B:Yes,butyou___________tellyourteacheraboutitwhenyou______beabsentfromclass.4.A:Hey!CanIlookatyourbook?B:Shh,we___________talkquietlyinthelibrary.5.A:Canyouputonyourseatbelt?We___________wearonewhenwe’reinacar.B:Sure.Thanks!haveto/mustcanhaveto/musthavetocan’thaveto/musthaveto/must插队等待你的顺序缺席系上安全带3cLookatthefirstsignandreadtherules.Thenwritetherulesfortheothersigns.Donoteatordrink.Noeatingordrinking.Youcan’t/mustn’teatordrink.Donotparkhere.Noparking.Youcan’t/mustn’tparkhere.Donottakephotoshere.Nophotos.Youcan’t/mustn’ttakephotos.Donotswimhere.Noswimming.Youcan’t/mustn’tswimhere.Donotfeedbirds.Nofeeding.Youcan’t/mustn’tfeedbirds.3dIngroups,brainstormthreerulesforoneoftheplacesbelow.Thendrawsignstoshowtherules.Shareyoursignsinclassandexplainwhattheymean.libraryschooldininghallparkcinemahospitalInthelibrary,wemustkeepquiet.Wemustn’tmakenoise.Wecan’t...祈使句肯定：1.Do型：动词原型+其他2.Be型：Be动词+形容词3.Let型：Let's+动词原型+其他否定：1.Don't型：Don't+动词原型2.No型：No+动名词/名词3.Let型：Let's+not+动词原型can,must,haveto情态动词课堂总结1．—Mustwesingasongattheparty?—No,you________.A．mustn’t B．haven’tto C．nothaveto D．don’thaveto2．It’ssnowing.Please________warmclothes.A．wear B．wears C．wearing D．towear3．________inbed.It’sbadforyoureyes.A．Nottoread B．Don’ttoread C．Don’tread D．Notread4．It’s7:15.Let’s________toschool.A．togo B．going C．go D.goneDACC一、单项选择当堂检测1.Youmustwearauniformatschool.（改为否定句）___________________________________________________2.Wecanlistentomusicintheclassroom.（改为一般疑问句，并作否定回答）___________________________________________________3.Don'ttalkinthelibrary.（改为同义句）___________________________________________________4.Hehastogetupearly.（改为一般疑问句）___________________________________________________5.Let'splaybasketballa