情态动词表推测用法总结及练习

1情态动词表推测用法总结（一）情态动词表推测的三种句式能用于表推测的情态动词：must,can,could,will,would,may,might,should,oughtto1.在肯定句中一般用must(一定)，may（可能），might/could（也许，或许）。（1）Hemust/may/mightknowtheanswertothisquestion?他一定/可能/也许知道这个问题的答案。（2）Itiscoldintheroom.Theymusthaveturnedofftheheating.屋里很冷，他们肯定把暖气关了。2.否定句中用can’t/couldn’t(不可能),maynot/mightnot(可能不)。（1）Itcan’t/couldn’tbetheheadmaster.HehasgonetoAmerica.这不可能是校长，他去美国了。（2）Hemaynot/mightnotknowthescientist.他也许不认识那位科学家。3.疑问句中用can/could(能……?)。（1）Couldhehavefinishedthetask?他可能把任务完成了吗？（2）Canhebeathomenow?他现在能在家吗？注：以上三种句式中情态动词的语气按程度都是依次递减的。might,could并非may,can的过去式，而表示语气较为委婉或可能性较小。Couldn’t比can’t语气弱一些。（二）情态动词表推测的三种时态1.对将来情况的推测，用“情态动词+动词原形”。（1）Shemust/may/might/couldarrivebefore5.5:00前她一定/可能/也许到。（2）Shemust/may/might/couldwalkmilesandmilesamongthehillswithoutmeetinganyone.她一定/可能/也许会在山里一连走好几英里而遇不到一个人。2.对目前或一般情况的推测，用“情态动词+be”或“情态动词+动词原形”。（1）Hecan’t(couldn’t)/may(might)notbeathomeatthistime.这个时候他不可能/可能不在家。3.对正在发生动作的推测，“情态动词+bedoing”（1）Hemust/may/might/couldbelisteningtotheradionow.他一定/可能/也许正在听收音机。4.对过去情况的推测，用“情态动词+have+过去分词”。（1）Itmust/may/might/couldhaverainedlastnight.Thegroundiswet.地湿了，昨晚肯定/可能/也许下雨了。（2）Thedoorwaslocked.Hecan(could)not/may(might)nothavebeenathome.门锁着，他不可能/可能不在家。（3）Can/Couldhehavegottenthebook？难道他找到书了吗？补充强调：推测的句型特点（对某一次的推测句型有两部分：语气和时态）（1）语气部分：（以下情态动词语气由强至弱）肯定句：must、may、might（=could）否定句：can’t（=couldn’t）、mayn’t、mightn’t疑问句：can、could（语气更加委婉不确定）（2）时态部分：be表示对现在的推测havedone表示对过去的推测bedoing表示对正在进行的推测语气部分写在前时态部分写在后，组合在一起就是推测（三）几组表推测的情态动词用法“情态动词＋完成时”是历年高考的热点，在做此类练习时，既需要掌握这一结构的基本用法，又应该仔细体会题干所提供的语言信息，准确理解语言环境和说话人的含义，尤其要注意题干中时态给予的暗示。.musthavedone表示对已经发生的事情的推测，意为“一定，想必”,句子中表示的是一种肯定的推测。这种结构一般只用于肯定句，其否定形式是can’t（couldn’t）havedone，表示“不可能，肯定不会”。例如：Hedidn’thearthephone.Hemusthavebeenasleep.他没有听到电话响，他肯定是已经睡着了。一、单项选择1John___cometoseeustonight,butheisn'tverysureyet.A.mayB.needC.can’tD.must2Johnisn’tintheclassroom.He___playsoccerontheplaygroundwithBob.A.canB.mustC.shouldD.can’t3-Willyougotothecinemawithus?-No,I___ratherreadamagazineathome.A.shouldB.mightC.wouldD.hadbetter4You___goandseeadoctoratoncebecauseyougotafever.A.canB.mustC.dareD.would5-CanyouspeakJapanese?-No,I____.A.mustn'tB.can'tC.needn'tD.maynot26-He___beintheclassroom,Ithink.-No,he___beintheclassroom.Isawhimgohomeaminuteago.can;maynotB.must;maynotC.may;can'tD.may;mustn't7-IsLenaswimminginthepool?-No,she___swim.Sheisterrifiedofwater.A.maynotB.mustnotC.can'tD.needn't8Heisn'tatschool.Ithinkhe___beill.A.canB.shallC.mustD.might9-Whatdoyouthink“upset”means?-I’mnotsure.It___mean“sad”.mayB.mustC.canD.should10Thechildren___playfootballontheroad.A.can'tB.canC.mustn'tD.must二、根据句子意思用must,might,could或can’t填空1.Thewhiteruler______________belongtoLucy.Hersisred.2.Ican’tfindmykeys.They______________bestillathome.3.Theexercisebook______________belongtoBob.Ithashisnameonit.4.Jim______________beathome.Hehasgonetohishometown.5.Thisblueshirt______________belongtoKen.Helikesbluebest.6.Theschoolbag______________bePaul’s.Therearealotofbooksinit.7.Thevolleyball______________belongtoAlice.Sheplaysvolleyballeveryday.8.Theclassroomisclean.Someone______________cleanitjustnow.9.–IsthatBobthere?–No,it______________behim.HehasgonetoShanghaiwithhisfamily10.–whereisMr.Lee?–Thelightinhisbedroomisstillon.He__________bethere.11.I______________findmypencilcase.IthinkIhavelostit.12.Theboyisclever.He______________tellmanystorieswhenhewasyoung.13.Themanisrunningfast.He______________becatchingthebus.14.LiLeihaslearnedEnglishfor15years.He______________knowthemeaningofthissentence.15.–Whatareyougoingtodothisweekend?–I’mnotsure.I______________visitmygrandparents.16.–Whoisthatboyinblue?–It______________beTim.HeisalwaysreadingEnglishthereeverymorning.–It______________behim.HeistalkingwithMissLiuintheclassroom.17.Ithoughtyou__________behungry,soIhavebroughtyousomecakes.18.-Herearesomeearrings.Theowner______beaboy.-Well,it_______beaboy.Theearrings______beapresentforhismother.19.-AreyoucomingtoJeff’sparty?-I’mnotsure.I___________gototheconcertinstead20.Ihavetriedtocallhimattheoffice,butthereisnoreply.He______________beathome.三、根据所给汉语提示完成句子。1.他脸色苍白,准是病了。Helookssopale,he____________________________2.她戴着钻石项链，一定很有钱。She’swearingadiamondnecklace.She____________________________3.他现在可能正在打篮球。He_____________________________basketballnow.4.我确信她不在家。I’msurethatshe______________stayathome.5.他肯定在花园里散步。He______________inthegarden.6.这本字典肯定是我的，上面有我的名字。Thedictionary____________mine.Ithasmynameonit.7.这张CD可能是属于Tony的，因为他喜欢听流行音乐。TheCD______________belongtoTonybecausehelikeslisteningtopopmusic.8.这个发带不可能是鲍勃的，终究他是个男孩。Thehairband______________beBob’s.Afterall,heisaboy!9．气温可降至—60℃，也就是零下60℃。Thetemperature______________fallto–60℃,thatis60℃belowfreezing.10．她可能不知道这件事。____________________________11．他担心他们可能不同意他的意见。Hewasafraid______________12．你辛苦干一整天，一定累了Youhaveworkedhardallday.______________13.再等十分钟，我弟弟可能正开车到这里来。Waitanother10minutes!Mybrother______________herenow.14.公园里现在肯定有一些老人正在散步。There_________someoldpeopletakingawalkintheparknow.15.别玩小刀，你可能会伤到自己的。Don’tplaywiththeknife.You______________3when，while，as引导时间状语从句的区别When1.表示“当……时候”，“当……之后”