情态动词的用法PPT课件

Unit2InEngland,youusuallydrinkteawithmilk.Wemustopenagiftlater.Wemustacceptagiftwithbothhands.Wemustuseredpaperforhongbao.wemustn’tdoanycleaningonthefirstdayoftheSpringFestival.We’dbetternothaveourhaircutduringtheSpringFestivalmonth.Wemustn’tbreakanything.somedifferencesbetweenChinaandtheUSChinatheUSTheycanopenthegiftimmediately.Theyneedn’twait.Theyneedn’tacceptagiftwithbothhands,theycanuseonehand.somedifferencesbetweenChinaandEnglandChinaEnglandgreetingsmannersatthebusstopTheymustsayMrorMrswhentheymeetsomeoneforthefirsttime.Whentheymeetfriends,theycanusetheirfirstnames.Wemayshakehandsorsmileateachotherwhenwemeetforthefirsttime.Theymuststandinalineandwaittheirturn.Theymustn’tpushtheirwayontothebus.Wemaypushourwayontothebus.用法:1.表示请求或允许:MayIgohome，please?注意：在疑问句中不用于第二人称2.表示可能性:Youmayberight.—No,you_________may/might—Yes,youmay.注意：might为may的过去式，但也可以代替may，语气较为婉转客气或更加不肯定。mustn’t/youcan’t.情态动词may,might,can,must,need的用法用法:1.表示能力:HecanspeakalittleEnglish.Canyoufly?3.表示请求或允许:CanIhelpyou?2.表示猜测:ThatcannotbeourEnglishteacher,becauseshehasgonetoShanghai.注意：could也可表示请求，语气委婉，主要用于疑问句，不可用于肯定句，答语应用can。CouldIcometoseeyoutomorrow?Yes,youcan.（否定答语可用No,I'mafraidnot.）can情态动词may,might,can,must,need的用法多用于否定句用法:2.表示推测“肯定，一定”:1.表示必须或命令:Youmustcomeearlytomorrow．—MustIfinishmyhomeworkfirst?Theymustbeathome.Thelightison.—Yes,youmust.—No,youdon'thaveto/needn't.注意：must开头的疑问句，其否定回答通常用don‘thaveto或needn’t，而不用mustn‘t.3.否定时表示“禁止”:Youmustn’tsmokehere.mustmustn’t情态动词may,might,can,must,need的用法[注意]⑴在表示客观需要时一般用haveto(不得不)，而不用must。It’srainingheavilysowehavetostayathomeanddosomereading.⑵在表示能力时，can可以和beableto互换,后者有人称变化和更多的时态变化。Hewasabletomendthemachineat18.Mybrotherwasveryill,soI()callthedoctorinthemiddleofthenight.Hesaidthatthey()workhard.hadtomustExercises:用法:既可以做情态动词,也可以做实义动词2.实意动词(needtodosth):1.情态动词(needdosth)—DoIneedtobuyabighouse?Heneedstobuyabighouse.NeedIbuyabighouse?—Yes,youmust.—No,youneedn’t/don’thaveto.(不必要)—Yes,youdo./--No,youdon’t.need情态动词may,might,can,must,need的用法()1.—Who’ssinginginthenextroom?—It____beher.ShehasgonetoNewYork.(2011浙江湖州)A.can’tB.mustC.shouldn’tD.canA中考链接()2.---Dad,thebreadisnotenough.Iamstillhungry._____Ihavesomethingmore?---Butthere’snothinginthefridgenow.(2011四川绵阳)A.MustB.NeedC.WillD.CanD()3.—Ican’tstopsmoking,doctor.—Foryourhealth,I’mafraidyou______.(2011贵州安顺)A.mayB.canC.havetoD.needC()4.—________Iswimhere?—I’msorry.Children_______swimalonehere.(2012年广东省)A.Must,can’tB.May,mustC.Can,mustn’tD.Can’tcanC（）5.You___theretoday.A.needn’tgoingB.needn’ttogoCdon’tneedtogoD.don’tneedgoingC（）6.Thebook___beLingling’s.Look,here’shernameonthebook.A.mustB.mayC.canD.needA1.A:CanyoudriveacarattheageofseventeeninEngland?B:Yes,we.HowaboutChina?A:No,we.2.A:CanyouopenagiftimmediatelyafteryoureceiveitinEngland?B:.WhataboutChina?A:No,weusuallydon’t.1Completetheconversationswithcanorcan’t.cancan’tYes,wecan3.A:CanyoupushyourwayontoabusinEngland?B:.HowaboutChina?A:No,weeither.4.A:Canyoudriveontheright-handsideoftheroadinEngland?B:.WhataboutChina?A:Yes,wemust.No,wecan’tcan’tNo,wecan’t3Underlinethecorrectwords.Itisimportanttoknowwhatyoumustandmustnotdowhenyoumeetpeoplefromadifferentcountry.You(1)may/mustnotaskWesterners“Howoldareyou?”becauseitisnotpolite.You(2)might/canknowsomeonewell,but(3)youmust/neednotask“Howmuchmoneydoyoumake?”He(4)may/canneverspeaktoyouagain!Inpublicplaces,you(5)must/canaskpeoplebeforeyoutakephotosofthem,andyou(6)mustnot/mightnoteatordrinkinshopsormuseums.Insomecountriesyou(7)cannot/cangointosomeone’shousewithyourshoeson.You(8)neednot/mustnottakethemoff.Butinsomeothercountriesyou(9)might/mustnotwearshoesinthehouse.