情态动词,情态动词基本用法,你能说出哪些情态动词1.can/could2.may/might3.should/oughtto4.need5.must6.will/would/shall7.dare,情态动词的用法1.情态动词不能单独使用，必须放在谓语动词之前2.情态动词后的谓语动词必须用原型3.变否定直接在情态动词后加not4.变一般疑问句，直接把情态动词提到句首,情态动词表推测对比---表达“也许，大概，可能，一定”等意思都是表示推测1.must:表“一定”，常用语肯定句中举个栗子：Theymustbeanxioustolearnaboutlocalcustoms.2.can/could:表“可能”，用于疑问句；can't/couldn't,表“不可能”，用于否定句中,举个栗子：--Canwhathesaidbetrue?--No,whathesaidcan'tbetrue.再举个栗子：--Canshebeintheparadenow?--No,shecan't.Itcan'tbethepostmanatthedoor.It'sonlysixo'clock.,情态动词表推测对比3.may/might:表“可能”,用于肯定句；maynot/mightnot,表”可能不”，用于否定句举个栗子：Sheiscoming.Shemay/mightbeournewteacher.Theremay/mightnotbeanyinkinthebottle.总结：句型情态动词中文含义肯定句must一定may/might可能否定句can't/couldn't不可能，一定不maynot/mightnot可能不疑问句can/could.....可能.....吗？,不同时间的推测对现在（常态）或将来事情的推测：情态动词+do对正在发生的事情的推测：情态动词+bedoing对过去发生事情的推测：情态动词+havedone举个栗子：Itmustoftenrainhereinspring.(对常态的推测）Itmayraintomorrow,forthereisnostarsintheskytonight.Listentothesound.Itmustberainingoutside.Theroadisn'twet.Itcan'thaverainedlastnight.,情态动词表请求，许可：可以吗？可以呀！句式情态动词中文意思区别疑问句Can/Could/May/Might......?可以......吗？能....吗？委婉性：could>canmight>may场合：can/could---口语may/might--正式肯定句can/could/may/might可以同上;一般疑问句的肯定回答用can/may否定句mustn't/can't/couldn't/may/mightnot不可以同上；一般疑问句的否定回答用can't/mustn't举个栗子：1.--May/MightIcomeintotheroomtoseemymother?---Yes,youcan.---No,youcan't/mustn't.2.Youmay/might/can/could/mustnotleavethereadingroomtillyoureturnthebook.3.---Could/CanIborrowyourdictionary?---Yes,youcan.No,youcan't/mustn't.4.Visitorscan'tlitterthegroundwithpaper.,情态动词can/could的其他用法1.表能力，“能，会”，此时could时can的过去式举个栗子：IcanspeakEnglishandFrench,butIcan'tspeakJapanese.Bythetimeshewaseight,shecouldplayseveralinstruments.2.表“一时之可能性”，常与sometimes，或attimes连用举个栗子：ItisusuallywarminmyhometowninMarch,butitberathercoldsometimes.can,情态动词may的其他用法1.用于祈使句中，表祝愿举个栗子：Mayyousucceed!MayGodblessyou!,情态动词must的其他用法1.表“必须”举个栗子：Everybodymustobeytherule.---MustIdoasIamtold?--Yes,youmust.No,youneedn't/don'thaveto.2.mustn't表“禁止”举个栗子：Fatherissleeping.Youmustn'twakehimup.3.表“偏要，偏偏要”，指做令人不愉快的事情举个栗子：Whymustyoualwaysinterruptme?句式情态动词中文疑问句Must.......必须.....吗？肯定句must必须否定句needn't/don'thaveto不必要，不需要,其他情态动词的用法---should1.should表“应该”=oughtto举个栗子：Youshouldn'tpalyatrickonher.Youknowsheisasensitivegirl.2.should表“竟然”，表示惊讶，难以置信的情绪举个栗子：It'sstrangethatheshouldbelievetheprediction.Themanshouldenterthedangerzonewithpermission.有题有真相：Itwassadtomethatthey,sopoorthemselves,bringmefood.should,其他情态动词的用法----will/would1.表“会，愿意”举个栗子：Iwillsupportyouforeverwhateverhappens.Willyoumarryme?2.表“注定会...”举个栗子：Manwilldiewithoutwater.Oilwillfloatonwater.3.would表“过去常常做”，且现在也可能还在进行。,其他情态动词的用法---shall1.表征求对方意见的疑问句中，此时句子主语必须是第一，或第三人称Shallwegotothecinematonight?ShallTomgowithus?2.表说话人给对方的许诺，命令，警告等。此时句子主语是第二，第三人称。--Ihaven'tgotthereferencebookyet,butI'llhaveatestonthesubjectnextmonth.---Don'tworry.YoushallhaveitbyFriday.3.表条约，规定中的义务或责任，翻译为“应当，应该”，此时主语为第三人称.Studentsshallwearschooluniformsintheschool.,其他情态动词的用法----need&dare(情态动词的两大叛徒）判断下列句子的正误。Heneednotgonow.Heneednottogonow.Hedoesn'tneedgonow.Hedoesn'tneedtogonow.need作实意动词，”需要做某事”needtodosthdare作实意动词，“敢做某事”daretodosth,情态动词+havedone情态动词的虚拟语气,情态动词的虚拟语气----情态动词+havedone情态动词+havedone:表示与过去事实相反的虚拟语气有题有真相1.We（face)thedifficultytogether,butwhydidn'tyoutellme?They（arrive)atlunchtimebuttheirflightwasdelayed.3.We（notwait)forhim.Wewastedawholeafternoon.should(not)havedone=ought(not)tohavedone过去本(不)应该做某事would(not)havedone过去本(不)会做某事could(not)havedone过去本(不)可以做某事might(not)havedone过去本(不)可能做某事need(not)havedone过去本(不)有必要做某事couldhavefacedwouldhavearrivedneedn'thavewaited,举个栗子：1.Heusedtobeveryrichbutsomethingmusthavehappenedtohim.2.Ishouldn'thavewatchedthatmoive--it'llgivemehorribledreams.3.Withouttheirhelp,Icouldn'thavewontheprize.Ortheycouldhavegoneexploringontheirownandlosttheirwaybacktothegroup.4.Thechildrenmighthavearrivedtherebynow.5.Iwouldratherhavegonetothemoiveyesterday.
