Unit1TalesoftheunexplainedGrammarandUsage教案Teachingaims1.TeachSstoformandusethepresentperfecttense.2.TeachSstolearnhowtoformandusethepresentperfectcontinuoustense.3.Tellthedifferencebetweenthepresentperfecttenseandthepresentperfectcontinuoustense.TeachingproceduresStepⅠLeadin1.MakeSstolookatthefollowingsentencesandpointoutwhattenseortensesareusedinthemandthereasonwhytheyareused.1)WehavestudiedEnglishforaboutfiveyears.Webegantostudyitfiveyearsago.2)Theymovedtothesouthin1990andhavelivedtheresincethen.3)Thestudentisdoingherhomework.Shehasn’tfinishedityet.4)Ericlefthomelastyearandhasjusteback.Takesentenceoneasanexample:ThetimewebegantostudyEnglishwasatadefinitetimeinthepast,soweusethepastsimpletense.Buttheactionstudyhappensagainandagain,soweusethepresentperfecttense.TellSs:Whenanactionhappensoveraperiodoftimethatbeganinthepastandcontinuestothepresent,thepresentperfecttenseisoftenused.StepⅡReadingAskSstoreadpoint1—6onpage8andexplainthereasonswhytheyareusedinthesesentences.ThenaskSstoreadpoint1—3onpage9.TellSsthatweusepresentperfectcontinuoustensetotalkaboutactionsthatstartedinthepastandarestillcontinuing,orhavejustfinishedbutarestillconnectedtothepresentinsomeway.Examples:I’vebeenwaitingforanhourandhestillhasn’tturnedup.I’msosorryIamlate.Haveyoubeenwaitinglong?StepⅢDifferencebetweenPresentperfectandpresentperfectcontinuoustenseparethefollowingsentences:LiuJiahasreadabookaboutStonehenge.(Shehasfinishedreadingthebook.)LiJiahasbeenreadingabookaboutStonehenge.(Sheisstillreadingthebook.)IhavevisitedEgypttwicethismonth.IhavebeentouringEgyptfortwomonths.Howmanytimeshaveyouswuminthelake?Howlonghaveyoubeenswimminginthelake?Similarities:Differences:StepⅣ現(xiàn)在完成時(shí)&一般過去時(shí)的區(qū)別JustindisappearedlastFridaynight.Justinhasdisappeared,soKellyisverysad.②Ihaveseenthefilm.Isawthefilmlastweek.總結(jié)：______________________Practice1:1.I_____Englishatuniversityforthreeyears,butnowI’veforgotit.A.havestudiedB.hadstudiedC.studiedD.havebeenstudying2.—Haven’tseenyouforages.Wherehaveyoubeen?—IwenttoTibetand_____(stay)theretea