Unit1,grammar：Modalverbs,Festivalsaroundtheworld,1.can與could,（1）表示能力。（2）表示客觀的可能性。（3）表示請示和允許。could較委婉。,（4）表示驚異、懷疑、不相信的態(tài)度：（用于否定、疑問和驚嘆句中）“難道會，究竟”。Canthisbetrue?,(4)may/mightaswell=hadbetter最好;不妨Youmightaswellhaveatry.,（1）表示允許或征詢許可。（2）表示可能性。might語氣更不肯定。（3）Maysb.do!表示祝愿。,2.may與might,3.shall與should,shall用于第一、第三人稱疑問句中，表示征求意見和向?qū)Ψ秸埵?。用于二、三人稱陳述句中，表示說給對方的命令、警告、允諾或威脅。should表示勸告和建議，“應(yīng)該”。表示推測，表示某個情況是合理的，指按常理判斷。表示說話人的態(tài)度，“竟然”。Icantbelievethatheshouldbesorudetooldpeople.,4.will與would,（1）表示意志或意愿。will指現(xiàn)在，would指過去。（2）表示請示、建議，would比will委婉。（3）表示習(xí)慣性動作，“總是，慣于”。will指現(xiàn)在，would指過去。（4）表示預(yù)料或猜想。,5.must與haveto,must“必須，應(yīng)該”，語氣強(qiáng)。mustnt表示“不準(zhǔn)，不應(yīng)該，禁止”。表示推測，“一定，想必”，只用于肯定句中。must表示發(fā)生了某種與說話人的愿望相反，不受歡迎的事，“偏偏，偏要”。,Whymusthedoitthatway?為什么他偏要那樣做？,haveto表示“必須，不得不”。,must和haveto的區(qū)別：must一種形式；主觀看法haveto有人稱、時態(tài)的變化；客觀需要,2.How_yousaythatyoureallyunderstandthewholestoryifyouhaveonlycoveredonlypartofthearticle?A.canB.mustC.needD.may,練習(xí)：,1.Mum，_IgooutandplaywithTomforawhile?No,Imafraidnot.Besides,itsrainingoutsidenow.A.cantB.wouldntC.mayD.wont,A,A,may表示請求。,B,can,may,could，might表示詢問或征求意見的問句中，肯定應(yīng)答用can或may，而否定應(yīng)答時用mustnt,D,3.Itakethebookout?Imafraidnot.A.WillB.MayC.MustD.Need,4.-MayItakethisbookoutofthereadingroom?-No,you.Youreaditinhere.A.mightntB.wontC.needntD.mustnt,5.Whenhewasthere,hegotothatcoffeeshopatthecornerafterworkeveryday.A.wouldB.shouldC.hadbetterD.might,6.Johnpromisedhisdoctorhe_notsmokeandhehasneversmokedeversince.A.mightB.shouldC.couldD.would,A,D,7.-Ihaventgotthereferencebookyet,butIllhaveatestonthesubjectnextmonth.-Dontworry.You_haveitbyFriday.A.couldB.shallC.mustD.may,shall在第二人稱中表示允諾。,B,8.Youcantimaginethatawell-behavedgentleman_besorudetoalady.A.mightB.needC.shouldD.would,C,9.Johnny,you_playwiththeknife,you_hurtyourself.A.wont;cantB.mustnt;mayC.shouldnt;mustD.cant;wouldnt,B,11.John,lookatthetime._youplaythepianoatsuchalatehour?AMustBCanCMayDNeed,A,12.Imissedthebus,soI_gohomeonfoot.A.mustB.mayC.canD.hadto,D,11.-Mustwedoitnow?-No,you_.A.wontB.needntC.cantD.dont,B,1.對現(xiàn)在(事情)推測：（情態(tài)動詞+動詞原形）,must+v.(肯定)may/might/could/can+v.(可能)cant+v.(不可能),情態(tài)動詞表示推測的用法,2.表示對過去事情的推測或估計,musthavedone“想必或肯定已經(jīng)做了某事”may/mighthavedone“可能/大概已經(jīng)做了某事”cant/couldnthavedone“不可能已經(jīng)做了某事”,注意：在疑問句中can/could表示對過去情況的推測，“可能已經(jīng)了嗎？”e.g.Someonemusthavebrokenintoourbedroom,Whocouldhavedoneit?,1.Shelooksveryhappy.She_havepassedtheexam.Iguessso.Itsnotdifficultafterall.A.shouldB.couldC.mustD.might,C,2.Youmustbeawriter,_?A.mustntyouB.areyouC.mustyouD.arentyou,D,3.Theymusthavegonetothelecture,_?A.didnttheyB.donttheyC.mustnttheyD.haventthey,D,4.Youbehungryforyouhadlunchonlyonehourago!A.wouldntB.cantC.mustntD.neednt5.She_haveleftschool,forherbikeisstillhere.A.cantB.wouldntC.shouldntD.neednt6.ItisusuallywarminmyhometowninMarch,butit_berathercoldsometime.A.mustB.canC.shouldD.would,A,B,B,8.-Lizawellnotwanttogoonthetrip-Shehatestraveling.A.willB.canC.mustD.may,7.Icantfindmypurseanywhere.Youhavelostitwhileshopping.A.mayB.canC.shouldD.would,maywell為固定搭配，意為：很可能，極有可能。,A,D,表示對過去所發(fā)生事情的遺憾或責(zé)備,1.should/oughttohavedone“過去本該做而沒做”2.shouldnt/oughtnttohavedone“過去不該做的事卻做了”3.could/mighthavedone“本來能夠做的事卻沒做”eg:Hecouldhaveworkedouttheproblem.,4.neednthavedone“原本不必做的事卻做了”eg:Youneednthaveleftinsuchahurry.,Heneednthavecome.Hedidntneedtocome.,他本沒有必要來（實際也沒來）,他本沒有必要來（實際卻來了）,5.didntneedtodo/didnthavetodo“沒有必要做，實際也沒做”,1.Iwasreallyanxiousaboutyou.You_homewithoutaword.A.mustntleaveB.shouldnthaveleftC.couldnthaveleftD.needntleave,2.Thankyouforyourhardworklastweek.Idontthinkwe_itwithoutyou.A.canmanageB.couldhavemanagedC.couldmanageD.canhavemanaged,B,B,4.Whatapity!Consideringhisabilityandexperience,he_better.A.needhavedoneB.musthavedoneC.canhavedoneD.mighthavedone,3.Catherine,Ihavecleanedtheroomforyou.Thanks.You_it.Icouldmanageitmyself.A.needntdoB.neednthavedoneC.mustntdoD.shouldnthavedone,B,D,5.H