Unit3TheworldonlineGrammarandusageTeachingaims:1.Afterlearningauxiliaryverbs,thestudentswillknowaboutsomebasicinformationaboutauxiliaryverbs(wordsusedasauxiliaryverbs;functionofauxiliaryverbs);2.Afterlearningauxiliaryverbs,thestudentswillbeabletosummarizeusagesofcommonandimportantauxiliaryverbs;3.Afterlearningauxiliaryverbs,thestudentswillapplywhatthey’velearnedaboutauxiliaryverbs.Teachingprocedures:Step1Lead-in(PPT4)Q:Whatareauxiliaryverbs?A:Auxiliaryverbsareusedinformingtenses,moodsandvoicesofotherverbs.Theverbsusedforthispurposeincludebe,do,haveandmodals.Step2Introduction(PPT5)Pointouttheauxiliaryverbs.1.Hedoesn'tlikeEnglish.2.Heissinging.3.Hehasgotmarried.4.HewassenttoEngland.5.Doyoulikecollegelife?6.DidyoustudyEnglishbeforeyoucamehere?7.Docometothepartytomorrowevening.8.Hedidknowthat.Step3Presentation(PPT6-24)Auxiliaryverbs:be(am/is/are/was/were/been)do(does/did)have（has/had）modals（shall/should/will/would/can/could/may/might/must/need/dare）Aphrasalauxiliaryverb（have(got)to,hadbetter/wouldsooner/rather(…than)/cannot(help)but/be(not)to/besupposedto/oughtto/usedto/beaboutto/beableto）1.be（am/is/are/was/were/been）Thesmallanimalsarekeptinthecages.Heisgivingalecture.TheInternethastoomuchinformationthathasnotbeenevaluatedforaccuracy.Yourhouseisbiggerandnicerthanmine.Iamtogoabroadonbusinesstomorrow.Tip:1）be作为本动词表示状态或客观存在等意思。2）be+不定词连用,表示约定、义务、命令等未来的动作或状态。3）be+现在分词构成各种进行时态。4）be+过去分词构成被动语态。5）be用于have/has/had后构成完成时。2.do（does/did）Hedidn’tfindanyusefulinformationontheInternet.Thesekindsoferrorsdonotoccurasoftenwhenpeopleusetraditionalreferencematerials.Then,whydoeshecomehere?Youdoknowalotaboutcomputers.NeverdidIseesuchastrangeman.Tip:1)do作为助动词时的时态、人称和数的变化有do,does,did三种形式。2)do+主词+原形动词构成疑问句。3)do+not+原形动词构成否定句。4)do(+not)+主词用于附带问句。5)do+原形动词用于加强语气句。6)Never(Only)等+do+主词+原形动词用于倒装句3.have（has/had）Ihaveneverseensuchastrangeman.CanIhavemyhaircutnow?Ioftenhavemyassistanthelpmedoit.Tip:1)助动词have+过去分词构成完成时态。2)have+受词+过去分词表示请或让别人做某事。3)have+受词+原形不定词表示请或让某人做某事。4.modals（shall/should/will/would/can/could/may/might/must/need/dare）Ok,Ishalldowhatyousaid.Ishallneverdosuchathing.Youshallgivemeacigarette,orIshalltelltheboss.WhereshallImeetyou?Youshouldworkharder.Youmustputonmoreclothesincaseyoushouldcatchacold.Willyougivemeacigarette?Thiswillbewhatyouneed.Shewillstandtheresleepingforhours.Ok,Iwilldoit.CanIhelpyou,sir?Iamcheckingout.Couldyougivemethebill?Ofcoursewecanwait.Coulditbethechargeforthefruit?Ican'thelpthinkingofit.MustIgowithyou?No,youneedn't.Youmustn'tforgetyourmedicalcard.Oh,itiswetoutside.Itmusthaverainedyesterday.Soitmustbeslipperyoutside.Dobecareful!Youneedn'thavetoldmethatmuch.Idarenotsayitisugly.Howdareyousayso?Tip:1)shall表示发言者的意志,包括诺言、决心、强制等;shall用于询问对方的意向。2)should表示义务，责任等。3)will用于第二人称疑问句中,询问对方意志或请求。will+原形动词用于所有人称,表意愿。would+原形动词表示过去一段时间的习惯。4)can,could在口语中相当于may,might,表示许可。can,could表示能力,相当于beableto。can,could表示怀疑、推测,一般用于疑问句或否定句。can,could用于惯用语。can‘thelp或couldn’thelp+动名词表示不得不、忍不住。5)must表示必须、义务等,强调主观因素。need...
