ModalVerbs情態動詞情態動詞?表示說話的語氣或情態。情態動詞本身有詞義，但不完全，不能單獨作謂語，必須和動詞一起構成謂語。?情態動詞沒有人稱和數的變化。?大多數情態動詞有過去式。主要情態動詞CanMayWill.MustShallNeedDareHadbetterWouldsoonerWouldassoonCouldMightWouldHavetoShouldOughttoUsedtoWouldrathermightaswell情態動詞問題解析：

maybe&maybeMaybe（可能是）???maybe（或許）（副詞）Thenewsmaybetme.Mavbethenewsistme.Shemaybewaitingforyouathome.Maybesheiswaitingforyouathome.Maynot&cannotmaynot譯為“可能不”、"也許不會''而非“不可以氣“不可以”為mustnot或caift（不許，不可以）。——MavIsmokehere?■一No,youmustn't,/youcan't/youcannot.Thenewsmaynotbetine.Youmustn'tmoveanyofthepapersonthedesk.Can&beabletoBeableto可以表示更多的時態。Wewillbeabletofinishtheworktomorrow.Hewasnotabletorealizehisgreatestambition.Areyouabletodesignanewcomputerprogram?Shehasnotbeenabletoworkoutthecomplexproblem.oughtto的否定土oughtto的否定式是oughtnotto,疑問句只把ought提前。Yououghttoberesponsiblefbryourself.Weoughtnottolookdownondisabledpeople.Oughtwetocountonhimforthesettlementofthedebate?MustMustdoMustbeMusthavedoneMust的反意疑問句Imustgetupatsix,?Shemustbeintheclassroomnow,?Theymusthavehadgreattroubletiyingtogetthere,?用must提問時的回答?肯定回答：must?否定回答：needn't或don't/doesn'thavetoMustIcomeasearlyas6tomorrowmornmg?Yes,voumust.7JNo,youneedn^./No,youdon'thaveto.Mustift&Needn'tMusthearriveveiyearly?No,hedoesn'thaveto/No,heneedn't.Must&havetoMust:主觀上認為“必須”作某事。Haveto:受客觀情況迫使而“不得不”作某事Youmustworkhardernowifyouwanttofindasatisfactoiyjobaftergraduation.Childreninremoteareashavetoquitschoolsimplybecausetheirparentscannotaffordtheireducation.Imusthelphim.(obligation,responsibility}Ihavetohelpliim.{unwillingness)Must&haveto的否定?否定must表示“禁止，不允許，一定不要”?否定doiTthaveto表示“不必，不一定非得，不一定要-We/ off-the/tvip whcuC.We/dovx/thave/to^puct:off-the/tvip,althou毋Must&haveto時態的區別Must只用于現在，而haveto則可用于不同時態。用hadto表示過去，用willhaveto表示將來。Wehadtoresorttoforceinthatcase.Wewillhavetoreconsiderthewholethingifthisplanfails.Onemusthavefaithinlife.havetohaveto的疑問句和否定句都要用助動詞do/does,過去式則用didoDowehavetowaitfbrhimtostartdiimer?Doeshehavetoshowyoutheticketstoenterthecinema?DidIhavetodotheothertaskaswell?Youdoifthavetocomeinperson.Shedoesn'thavetobringherdictionaiy.Wedidn'thavetomakepreparationsforthequiz.Need&dareNeed&dare既能作實義動詞，又能作情態動詞。Need&dare在肯定句中，通常為實義動詞，后面的不定式要帶to,單數第三人稱加s,有時態變化。Need&dare作情態動詞時，多用于否定句和疑問句。ExamplesSheneedstoworkevenharderifshewantstosucceedinherstudy.Hedarestospeakthetmth.Doyouneedtotakeabreak?Theydidiftdaretodisobey.Needheleavesosoon?Youneedifthavedonealltheheavywork.Shedarenotgohomelateatnight.HowdareyousayIamunfair?mightaswellmightaswell譯為“不妨"表示規勸。YoumightaswellwaittoseewhatIcandoforyou.Youmightaswellleavenow.Wemightaswelltiyasecondtimetoseewhat'swrongwiththeequipment.beto可視為情態動詞beto的三種意義?①系表結構Mydutyisinstinctstudentsonwhatiswrongandwhatisright.?②將來'時的特殊表達法Iwastogobackhomewhenthephonecalled.?③"應當”“規定是”可視為情態動詞-besupposedtoYouaretoobeytheschoolmlesandregulations.Wouldrather表意愿：Iwouldrather/soonernotgothereonmyown.表選擇：Shewouldratherdiethansurrendertotheenemy.(句型Wouldratherdosth.thandosth.else)?表虛擬：wouldrathersb.did/didn'tdosth.Iwouldratheryoudidn'tdoanythingforthetimebeing.Usedto&would?情態動詞usedto表“過去常常做”。往往含有“不再如此”之意。Would只能表示動作，不能表示狀態。而usedto都可以。.Hewouldasktheteachersomestrangequestions.Heusedtoasktheteacher Heusedtobemuchbetteroffthanheisnow.Hewouldbemuch (wrong)MoreInformationWould側重敘述過去，而usedto強調過去和現在的對比。Sometimesshewouldgivemesomepleasantsurprises.Mymotherusedtobehot-tempered,butnowsheisveryniild.情態動詞的完成式needn'thavedone表示過去本不必做的事情Youneedifthavedoneallthecalculationbyyourself.Wehavecomputerstodothatsortofwork.Sheneedn,thaverisensoearly.Therewasnohuny.Theyneedifthavebroughtsomuchfoodwiththem.Wehadenoughforalltheguests.Musthavedone對過去事情的肯定猜測Hemusthaveworkedveiyhard,fbrhedidagoodjobillthelastexam.Theymusthavehadaquanel.Theyhadn'ttalkedwitheachotherfornearlyaweek.Theremusthavebeenablackout.Thewholestreetwasindarkness.can't/couldn^thavedone對過去事情的否定猜測（musthavedone的否定形式）Itcan^havebeenher.ShehasgonetoShanghai.Youcan'thaveseenmeinthemeetinglastweek.Iwasonabusinesstripthen.Hecan'thaveworkedhard.Ihaveseenhimplayingwithhisneighborsveiyoften.could&may/mighthavedone

表示對過去事情的可能性的推測Youmay/mighthavebeeninjuredinthecaraccident.Youmayhavebeenhurtbythewildanimal.Youmayhavereadthebook.Youmighthavebeenmorecarefill.Willhavedone表示將來完成時Bytheendofthisweek,thebuildingwillhavebeencompleted.ByMayorJune,wewillhavealreadyknownwhetherChinasucceedsinbiddingforthe2008OlympicGames.Bynextmonth,wewillhavelearnedthefirst5chapters.Would/couldhavedone表示對過去虛擬Youcould/wouldhavedonemuchbetterifvonhadfollowedtheteacher'sinstmctions.Theearthcouldhavebeenabetterplaceifwehadallknowntheimportanceofprotectingtheenviromnent.Youcouldn'thavebeensomiserablehadyoulistenedtomyadvice.Shewouldn'thavefailedtheEnglishexamifshehaddoneenoughrevisionexercises.