Unit2SectionA3a-3dGrammar课件人教版级下册

七下Unit2

NoRules,NoOrder

SectionA3a-3dGrammar祈使句

和

情态动词的用法总结Walkinthehallway.Bepoliteandtreatoneanotherwithrespect.Canwebringourphonestoclass?Canweeatsnacksinclass?Don’trun!Don’tlitter./Youmustn’tlitter./Youcan’tlitter.No,wecan’t.Wemust

keeptheminourlockers.No,wecan’teatinclass.Wehavetoeatinthedinninghall.3a.Readthesentences.Dotheverbsinboldneedtochangeforms?Why?礼貌待人，互相尊重。我们可以带手机来上课吗?

我们能在课堂上吃零食吗?不要跑！不要乱扔垃圾。/你一定不能乱扔垃圾。/你不能乱扔垃圾。不，我们不能。我们必须把它们放在储物柜里。不，我们不能在课堂上吃零食。我们必须在餐厅吃。3aTranslatethesentences.

在走廊里走。

发现归纳：祈使句

祈使句是用来表示请求、命令、劝告、警告、禁止等语气的句子。一般省略主语_____________。肯定式以___________开头，否定式在动词原形前加___________。you动词原形don’t祈使句类型：1.Do型

动词原形+其他2.Be型Be+表语3.Let型

Let+宾语+动词原形4.No型No+V-ing./No+n.

Do型,Be型

和Let型

的否定形式都是在句首加____________.Don’t情态动词can,haveto,must：canhavetomust含义1.表能力，意为“能；会”2.表请求、许可，意为“可以”不得不；必须(客观)必须(主观)例句Icansing,butIcan’tdance.We

havetoweartheschooluniform.

Wemustbeontime.共同点后跟动词原形后跟动词原形后跟动词原形情态动词否定形式：can’t,don’thaveto,mustn’t：can’tdon’thavetomustn’t含义不能；不可以不得不；必须表示禁止,“一定不能;不许”.例句Wecan’teatsnacksinclass.We

don’t

havetoweartheschooluniformathome.

Wemustn’tbelatefoeschool.共同点后跟动词原形后跟动词原形后跟动词原形3b.Completethesentencesusingcan,

haveto

/

must,

can’t

/mustn't.1.Don’tjumpthequeue.You_____________waitforyourturn.2.I______feedmydogmanykindsoffood,butI____________givehimchocolate.Itisbadforhim!3.A:CanIleavetheclassifIdon’tfeelwell?B:Yes,butyou_____________tellyourteacheraboutitwhenyou____________beabsentfromclass.4.A:Hey!CanIlookatyourbook?B:Shh,we______________talkquietlyinthelibrary.5.A:Canyouputonyourseatbelt?We______________wearonewhenwe’reinacar.B:Sure.Thanks!haveto/mustcancan’tmusthavetohaveto/musthaveto/must3c.Lookatthefirstsignandreadtherules.Thenwritetherulesfortheothersigns.Donoteatordrink.Noeatingordrinking.Youcan’t/mustn’teatordrink.Donotpark.Noparking.Youcan’t/mustn’tpark.Donottakephotos.Nophotos.Youcan’t/mustn’ttakephotos.3c.Lookatthefirstsignandreadtherules.Thenwritetherulesfortheothersigns.Donotswim.Noswimming.Youcan’t/mustn’tswim.Donotfeedthebirds.Nofeeding.Youcan’t/mustn’tfeedthebirds.3c.Lookatthefirstsignandreadtherules.Thenwritetherulesfortheothersigns.3d.Ingroups,brainstormthreerulesforoneoftheplacesbelow.Thendrawsignstoshowtherules.Shareyoursignsinclassandexplainwhattheymean.library

schooldininghall

park

cinema

hospitalInthelibrary,wemustkeepquiet.Wemustn’tmakenoise.Wecan’teatsnacks.Wecan’t...3d.Ingroups,brainstormthreerulesforoneoftheplacesbelow.Thendrawsignstoshowtherules.Shareyoursignsinclassandexplainwhattheymean.library

schooldininghall

park

cinema

hospitalIntheschooldininghall,wemustn’tlitter.Wecan’tfight.Wecan’twastethefood.Wecan’t...根据汉语意思完成英语句子，每空一词。1.不要插队。那是不礼貌的。_______________________________.That'snotpolite.2.请每天准时到校。___________________school_____________everyday.3.你绝不能缺席今天下午的会议。

You_______________________________________theme