Unit2NoRulesNoOrderSectionAGrammarFocus课件人教版英语七年级下册

Unit2NoRules,NoorderSectionAWhatrulesdowefollow?GrammarFocus一、祈使句1.Do型，即以行为动词原形开头

。Comehere.过来2.Be型，即以be动词开头

。Bequiet!安静Becareful!小心3.Let型，即以动词let开头

。Letmedoit.让我来做吧一般以动词原形开头，表示请求、命令、劝说、警告等。在祈使句中，通常省略句子主语第二人称you。No型祈使句4一、肯定结构Imperatives祈使句否肯否肯否否Do型祈使句Be型祈使句Let型祈使句No型祈使句1234Don’t+动词原形(+宾语)+其他.Be+表语(名词/形容词)+其他.Don’t+be+表语(名词/形容词)+其他.Let+宾语+动词原形+其他.Don’tlet+宾语+动词原形+其他.Let+宾语+not+动词原形+其他.No+动词-ing形式.No+名词.Summary否定结构祈使句3.No+名词/动名词.Nophotos./Noparking.4.用never代替don’t来加强语气。Nevergiveup!二、情态动词can，haveto和must的用法（一）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。1.表示能力，意为“能，会”。WecanspeakEnglish.我们会说英语。Icanplaybadminton,butIcan’tplayvolleyball.

我会打羽毛球，但我不会打排球。2.表示许可，意为“可以”。IcanwatchTVattheweekend.

我可以在周末看电视。Wecan’truninthehallways.

我们不能在走廊里奔跑。3.表示请求，意为“可以”。—CanyouhelpmewithmyChinese?

你能帮助我学习中文吗？—Yes,Ican.是的，我可以。（二）情态动词haveto和must的用法haveto①常强调客观需要,意为“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，意为“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”。Hehastogothereonfootbecausehisbikeisbroken.

因为自行车坏了，他不得不步行去那里。Youdon’thavetogetupearlytoday.你今天不必早起。Wemustdosomethingtoprotecttheearth.

我们必须做点什么来保护地球。Youmustn’ttalktoyourmotherlikethat.

你不准那样跟你妈妈说话。Walkinthehallway.Don’trun!Bepoliteandtreatoneanotherwithrespect.Don’tlitter./Youmustn’t

litter./Youcan’t

litter.Canwebringourphonestoclass?No,wecan’t.Wemustkeeptheminourlockers.Canweeatsnacksinclass?No,wecan’t

eatinclass.Wehavetoeatinthedininghall.Readthesentences.Dotheverbsinboldneedtochangeforms?Why?3aWhatdotheyhaveincommon?can,must,haveto后都是加动词原形1情态动词除了haveto之外，其余没有人称和数的变化2情态动词不能单独作谓语，后跟动词原形特点情态动词ModalVerbsModalVerbs情态动词1.Wemustrespecttheelderly.2.Wehavetowearuniformsatschool.must表达说话者主观的看法，常用于表达个人的决心、义务感或内在的驱动力。haveto强调由于客观需要，导致不得不做某事，并非完全出于个人意愿。例句PhrasesjumpthequeuebeabsentfromclassfeedthedogPhrasestalkquietlyinthelibraryputontheseatbeltCompletethesentencesusingcan,haveto/must,orcan't/mustn't.3b1.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/mustcancan’t/mustn’thavetocanhaveto/musthaveto/mustLookatthefirstsignandreadtherules.Thenwritetherulesfortheothersigns.3cDon’tpark.Noparking.Youcan’t/mustn’tpark.Don’ttakephotos.Nophotos.Youcan’t/mustn’ttakephotos.Lookatthefirstsignandreadtherules.Thenwritetherulesfortheothersigns.3cDon’tswim.Noswimming.Youcan’t/mustn’tswim.Don’tfeedthebirds.Nofeeding.Youcan’t/mustn’tfeedthebirds.Ingroups,brainstormthreerulesforoneoftheplacesbelow.3dlibraryschooldininghallparkcinemahospitalInthelibrary,wemustkeepquiet.Wemustn’tmakenoise.Wecan’tbringfoodtothelibrary.Wecan’ttalkloudlyinthelibrary.…Thendrawsignstoshowtherules.Shareyoursignsinclassandexplainwhattheymean.SampleLibraryRulesInthelibrary,wemustkeepquietfirst.Wemustn’tmakenoise.Second,wecan’tbringanyfoodordrinktothelibrary.Wemustkeepitcleanandtidy.What’smore,wehavetoreturnthebooksafterwefinishreading.Let’s