情态动词用法课件.ppt

Unit5Canyoucometomyparty Period3 3a 3 GrammarFocus 情态动词主要有 may might can could must haveto shall should will would oughtto need dare usedto Grammarfocus 现在我们来着重学习情态动词can以及haveto的用法 其特征主要有 1 不能独立作谓语 只能和动词原形一起构成谓语 表示说话人的语气和情态 2 没有人称和数的变化 haveto除外 3 否定形式 在其之后加not haveto除外 疑问形式 情态动词提到主语之前 haveto除外 can为情态动词 在本单元中表示请求 用于发出邀请 后跟动词原形 当同意接受对方的邀请时 常用Sure I dloveto Certainly Ofcourse 等来回答 若不接受 常用Sorry等来有礼貌地拒绝 一般情况下需要说明不能接受邀请的原因以表示歉意 Canyoucometomybirthdaypartytomorrow 明天你来参加我的生日聚会 好吗 Sorry Ican t Iamgoingtovisitmygrandpa 很抱歉 我来不了 我要去看我爷爷 1 can may都可表示 许可 may用于较正式 客气的场合 而can比较随便 口语 Youmay cansmokehere Borrowersmaynottakeoutofthelibrarymorethantwobooksatatime Thepolicemansaysyoucan tparkhere 2 May CanI we 表示征询对方许可 Canyou 表示请求 MayIuseyourphone Yes youmay Yes please No youmaynot No youmustn t No you dbetternot I mafraidnot I msorry I dratheryoudidn t CanIgooutandplay Mum Yes Certainly youcan No youcan t Canyouhelpmewiththisbag Withpleasure Sorry Ican t 3 都可表示 可能性 肯定句 Mr Reedlookspale Hemaybeill 事实上的可能 Mr Readisinpoorhealth Hecanbeillatanytime 逻辑 理论上的可能 Thisnewsmaybetrue might could 事实上的可能 WangWeicanbereallystubborn 有时或偶然可能会 could 否定句Thisnewsmaynotbetrue 也许不 mightnot Thisnewscan tbetrue 不可能 couldn t 疑问句Canthisnewsbetrue Could Maythisnewsbetrue 4 can还可表示 能力 能够 Youcanswim can tyou No Ican t Ican tpromiseanything butI lldowhatIcan TicketscanbeboughtfromtheTouristInformationCenter 2 might could分别为may和can的一般过去时 分别表示过去的 许可 可能 和 能力 能够 等 Thechildrenaskedwhethertheycould mightgoforaswim 过去许可 Iwasafraiditmightrainthatafternoon 过去可能 Heaskedifthenewscouldbetrue 过去可能 Canthenewsbetrue Shesaidhecouldspeakseverallanguages 过去能力 Icouldn tfindhertelephonenumber 过去能够 2 都可表示现在或将来的 可能性 语气没有may肯定 There ssomeoneatthedoor Itcould might may beGeorge 肯定句 Itcouldn t can t beGeorge 否定句 Could Can itbeGeorge 疑问句 Accordingtotheradioitcould might mayraintomorrow Lightningcould can bedangerous 3 Might CouldI we Couldyou 表示更委婉 更客气的请求 Might CouldIaskyouonemorequestion Yes ofcourseyoumay might can could Couldyouhelpmewiththeseboxes OfcourseIcan Withpleasure 有时在陈述句中也表示更委婉 更客气的请求或邀请 IwonderifIcould mightleavenow Idon tsupposeyoucould might 3 can beabletocan am is areableto shall willbeableto Noonecandoit Nooneisabletodoit Canyoucometonight Willyoubeabletocometonight 2 could表示过去的技能 本能 was wereableto表示过去某一具体场合经过努力而做成某事 IcouldswimwhenIwassix Hestartedlate buthewasabletocatchtheeighto clocktrain buthemanagedtocatch buthesucceededincatching But Mr Smithcouldn t wasn tabletoseeyoubecausehe sgotabadcold 3 beableto还有完成式和非谓语形式 I msorryIhaven tbeenabletoansweryourletter I msorryfornotbeingabletoansweryourletter Tobeabletorunisveryimportantforafootballer 4 haveto的意思是 必须 不得不 往往强调由于客观原因而必须做某事 haveto后接动词原形 haveto有人称 数和时态的变化 其第三人称单数形式为hasto 其疑问形式和否定形式要借助于助动词do或does来完成 例如 Wehavetolookafteroursisterathome 我们不得不在家照顾我们的妹妹 Doeshehavetogetupearlytomorrowmorning 明天早上他必须早起吗 Idon thavetostayathometoday 今天我不必呆在家里 情态动词 haveto 与其他的情态动词如 can may must 和 should 不同 1 这4个情态动词没有人称的变化 而haveto有 它的第三人称单数为 hasto 如 Heshouldstudyhard Hehastostudyhard 2 这4个情态动词在一般疑问句中将它们放在句首 在否定句中直接在他们后边加not即可 我们以can为例 Canhegowithus 他能和我们一起去吗 Hecan tgowithus 他不能和我们一起去 而 haveto 要加助动词do does或did才可能完成其疑问句 否定句 5 must havetomust表示主观 必须 haveto表示客观客观需要 即 不得不 Idon tlikethisTVset Imustbuyanewone ThisTVsetdoesn twork Wehavetobuyanewone now Youmustgetupatfivetomorrow We will havetogetupearlytomorrow we regoingtoDevon future IhadtoleaveearlybecauseIwasn tfeelingwell Shesaidshemust hadtoseethemanager past 表示邀请的句型 你能来参加我的聚会吗 Canyoucometomyparty Couldyoucometomyparty Wouldyouliketocometomyparty 接受邀请 拒绝邀请 Sure I dlove liketo I msorry Ican t Ihaveto I mV ing Task总结 Exercise 一 选择正确的词Thankyoufor ask asking butIcan tgotothemovieswithyou Paulhastostudy at for themathtesttonight Mysisterhastoo much many homeworktodo asking for much 4 Canyoucometomyparty at on Saturdaynight 5 Sheinvitesme watch towatch thebasketballmatchthedayaftertomorrow 6 Ilikeplaying piano thepiano on towatch thepiano 二 对话填空 每空一词 单词的首字母已给出 A Hey XiaoWang canyougotothem onSaturday B I ms Ican t Ihavetoomuchh thisweekend AndI mnotf welltoday A That stoob What sthematter ovies orry omework ad eeling B I mnotsure MaybeIhaveac asI mfeelingalittlecold A Ithinkyou db gotothed B Ialsot so A MaybeI maskingyoutocomeanothertime B Sure T forasking old etter octor hink hanks 三 选择题1 CanyouplaytenniswithonSaturday A usB weC ourD ours2 Henryhishomeworkthisafternoon A havetodoB havetodoingC hastodoD hastodoing3 Tonyisplayingtennistheschoolteam A onB inC toD with4 Jimplaysoccerwithhisfriendthisweekend becauseheisverybusy A canB cansC cann tD can t A C B D 5 It sOctoberthe14th A WhenistodayB what stodayC WhattimeistodayD Whatdayistoday6 Heiswithhisfatherthewholeday A fishB fishesC tofishD fishing B D 7 Canyoucometomyparty A Sure IloveB Sure IlovetoC Sure I dlovetoD Sure I dlove C 8 Wouldyouliketoplayfootballwithus butI mbusy A No Ican tB No Iwouldn tC Yes I mgladD Yes I dloveto9 Itaketh