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1、Unit3OnlinetoursGrammarPre-taskEnjoyasongIt’sbeenalongdaywithoutyoumyfriendAndI’lltellyouallaboutitwhenIseeyouagainWe’vecomealongwayfromwherewebeganOhI’lltellyouallaboutitwhenIseeyouagainWhenIseeyouagainDifferencesbetweenthesimplepasttenseandthepresentperfecttense(1)TenseStructure(结构）thesimplep
2、asttensethepresentperfecttense主语+动词过去式+其他主语+have/has+动词过去分词+其他Pre-taskFindoutthetensesmainlyusedinthepassageMilliehadadreamlastnight.ShedreamtoftravellingtotheUSA.MilliehasbeentotheUSAonce.Shewenttherein2013.Shehadawonderfultimethere.HeruncleisintheUSA.Hehaslivedthereforethreeyears.Differencesb
3、etweenthesimplepasttenseandthepresentperfecttense(2)TenseConcept(概念)thesimplepasttensethepresentperfecttense表示过去某时发生的动作，和现在（有/没有）关系。表示过去发生的某一动作,强调和现在（有/没有）关系。没有有1.FinishPartA&PartBonPage41byyourselves.2.Checkanswersingroupsandgiveyourreasons.Pre-taskFinishsomeexercisesDifferencesbetweenthesimpl
4、epasttenseandthepresentperfecttense(3)TenseThetimeexpressions(标志词)thesimplepasttensethepresentperfecttenseyesterday,Lastyear,inMay,in+过去某一年，twodaysago,justnow等already,just,yet,ever,never,recently,before,for+一段时间,since+过去的时间点,theseyears,sofar,upto/tillnow,in/during/overthepast/lastfew/threeyears
5、 once,twice,severaltimes等accordingtothecontext(语境)Weusethepresentperfecttensetotalkaboutanactionthatstartedinthepastandcontinuestothepresent.DanielhaslivedinBeijingfortwoyears.Weusethesimplepasttensetotellwhathappenedinthepast.DanielwenttoBeijingtwoyearsago.Differencesbetweenthesimplepasttensea
6、ndthepresentperfecttense.Danielhasboughtanewcomputer.(Danielhasanewcomputernow.)Weusethesimplepasttensetotellwhathappenedinthepast.Danielboughtanewcomputerlastmonth.Weusethepresentperfecttensetotalkabouttheresultofanaction.Whentheactionhappenedisnotveryimportant.Itmighthappenjustnoworsometimeag
7、o.MrWuhasbeentoCanadatwice.MrWuvisitedCanadain2010and2011.Weusethesimplepasttensetotellwhathappenedinthepast.Weusethepresentperfecttensetotellhowmanytimesanactionhappenedtillnow.Lookatthepicturesandcompletethesentenceswiththekeywo
