高一英语下情态动词PPT课件.ppt

Grammar 情态动词 非推测性情态动词shall will must mustn t should would的用法 情态动词could should oughtto may might needn t havedone表示假设的用法 情态动词must can could may might should oughtto表猜测的用法 情态动词的一些惯用法 表示推测 情态动词的重要用法 肯定的推测可能的推测否定的推测疑问的推测 must 对将来对现在对过去 情态动词 may might can t couldn t can could V V havedone常见mustbe bedoing V V havedone bedoing可以用not表示 可能不 V V havedone bedoing V V havedone bedoing Must havedone表示对过去已经发生的行为进行推测 意为 想必 准是 一定作了某事 1 Wemusthavelearned2 000wordsbytheendoflastterm 到上学期为止我们一定学了有两千个单词 2 HemusthavegonetoBeijing 他一定已经去北京了 can could havedone表示对过去的行为的怀疑和不肯定 通常用在否定句和疑问句中 1 Cantheyhavewonthebasketballmatch 他们可能赢了篮球赛吗 2 Itcouldn thavebeenMr Green HehasgonetoNewYork 那不可能是格林先生的 他已经去北京了 could 不用can havedone 在肯定句中表示 本来能够 而没能 具有婉转的批评和责备之意 Youcouldhavetoldmeearlier 你本该早点告诉我的 should oughtto havedone用于肯定句时 表示 本该做某事而实际上没做 用于否定句时 则表示 不该做的事反而做了 1 Youshouldhavetoldhimaweekago 你本来应该在一周前告诉他的 might 不用may havedone表示 本来可能 但实际上没有发生的事 另外 还可表示 本来应该或可以做某事 之意 含有轻微的责备语气 1 Youmightnothavetoldher 你本可以不告诉他的 事实上你告诉他了 2 Youmighthavecomeearlier 你本可以早点来的 但没有这样 needn t havedone表示做了本来不必去做的事 1 Sheneedn thavegonetothestationyesterday 昨天她本不必到火车站去的 昨天她去了 2 Youneedn thaveboughtit 你本可不必买它的 你买了 巩固练习 1 Oh I mnotfeelingwellinthestomach I somuchfriedchickenjustnow A shouldn teatB shouldn thaveeatenC mustn teatD mustn thaveeaten2 Whyhasn tJanearrivedyet She againinthemorning A shouldn thaveoversleptB mayhaveturnedoffthealarmclockC musthavenoonetocallherD shouldhavesomeonetowakeherup3 Didyougotothemoviethedaybeforeyesterday No We butwedecidednotto A shouldhavegoneB couldgoC shouldgoD couldhavegone B B A 4 Asitturnedouttobeasmallhouseparty we soformally needn tdressB didn thavetodressupC MightnothavedressedupD needn thavedressedup5 I mrathersurprisedyouhaven treportedhimtoyourteacher Inmyopinion you thisassoonasyoufoundouthewascheating musthavedoneB mighthavedoneC shouldhavedoneD couldhavedone D C 1 作为情态动词用 常用在否定句和疑问句中 Dare need S VS daren t needn t V Idaren twalkthroughtheforestatnight Dareyouwalkthroughtheforestatnight Youneedn treturnthebooknow Needhegoyesterday 可兼做行为动词的情态动词 need dare 2 作实义动词用 常用在肯定句中 有人称 时态 和数的变化 Heneedstogotherehimself Hehasgrownup wedon tneedtoworryabouthim 3 Sth sb need want request doing tobedoneThehouseneedscleaning tobecleanedTheboyneedssendingtothehospitalatonce 句型时态动词情态动词dare实义动词dare肯定句现在时daredodare darestodo过去时daredodaredtodo否定句现在时daren t darenotdodo doesnotdare to do过去时darednotdodidnotdare to do疑问句现在时Darehedo Doyou Doeshedare to do 过去时Daredhedo Didhedare to do 2 Iwonderhowhe thattotheteacher A daretosayB daresayingC notdaresayD daredsay D 4 Asitturnedouttobeasmallhouseparty we soformally Aneedn tdressB didn thavetodressupC MightnothavedressedupD needn thavedressedup D 1 判断正误 Howdareyousaysuchathing Howdareyoutosaysuchathing Hedaren ttospeakEnglishbeforesuchacrowd didhe Hedaren tspeakEnglishbeforesuchacrowd darehe Exercises Nobodyneedtobeafraidofcatchingthedisease Nobodyneedbeafraidofcatchingthedisease Thesedishesneedbecleanedcarefully Thesedishesneedtobecleanedcarefully Thesedishesneedcleaningcarefully hadbetter 最好 should 应该 与oughtto 应该 均为提建议 阐述观点的情态动词 其后接动词原形 should比hadbetter语气强 oughtto语气最强 一般情况下should与oughtto可通用 例1 你最好立即去那里 Youhadbettergothereatonce 例2 你应该努力工作 Yououghtto shouldworkhard 一 否定句hadbetter should oughtto用于否定句时 否定词均位于其后 具体形式为 hadbetternotdo shouldn t shouldnotdo oughtn ttodo 例1此时你最好别出发 Youhadbetternotstartatthistime 例2 她不应该浪费时间 Sheoughtn ttowastetime 二 一般疑问句hadbetter should oughtto用于一般疑问句时 分别将had should ought提至句首 例1 他最好立即出发吗 Hadhebetterstartearlyatonce 例2 你应该这么做吗 Shouldyoudolikethis 例3 他应该去那里吗 Oughthetogothere 三 反意疑问句陈述句谓语动词含hadbetter should oughtto时 反意疑问句为 had should与ought 主格人称代词或hadn t shouldn t oughtn t 主格人称代词 例1 你最好别回家 是吗 Youhadbetternotgohome hadyou 例2 你应该认真学习 是吗 Youshouldstudyhard shouldn tyou 例3 你上课不应该讲话 是吗 Heoughtn ttospeakinclass oughthe 1 Theflowerisdead I ityesterday A shouldwaterB mustwaterC shouldhavewateredD mustn thavewatered2 WhattimeoughtI A arrivedB arrivingC arriveD toarrive3 He speaktohismotherlikethat A oug