资源描述：
《八下unit8课件.ppt》由会员上传分享，免费在线阅读，更多相关内容在教育资源-天天文库。
1、Welcometoourclass!presentperfecttense:have/has+done助动词（have/has+过去分词）godowriteseetakebreakbuydrinkdriveCompetition1wentgonediddonewrotewrittensawseentooktakenbrokebrokenboughtboughtdrankdrunkdrovedriven用法一：表示完成了的动作对现在造成影响,常与下列词连用（already,yet,just,ever,before,never
2、,recently,sofar,inthepast/lastfewyears)Ihaveeverseentigers.Wehavealreadyfinishedunit7..Jimhasn’teatenbreakfastyet.Makesentencesasmanyaspossible（already,yet,just,ever,before,never,recently,sofar,inthepast/lastfewyears)competition2用法二：从过去某一时间开始的状态或动作持续到现在，有可能继续持续下去。
3、Hehasbeenillforaweek./sinceaweekago.Ihavebeenasoldierfor2years./since2yearsago.Shehaslearnttodriveforamonth./sinceamonthago.Istartedteachingin2002./14yearsago.IhavetaughtEnglishfor14years.Ihavebeenateacherfor14years.IhavetaughtEnglishsince2002.Ihavebeenateachersin
4、ce2002.IhavetaughtEnglishsince14yearsago.Ihavebeenateachersince14yearsago.2002nowWecametoNo2MiddleSchoolin2013./3yearsago.Wehavestudiedherefor3years.Wehavebeenherefor3years.Wehavestudiedheresince2013.Wehavebeenheresince2013.Wehavestudiedheresince3yearsago.Wehavebe
5、enheresince3yearsago.2013nowLook.Jeffisplayingtheguitar..Look.Itisrainingoutside.Itstartedtorain5daysago.Howlong…..?Hebegantoplayit3hoursagoHowlong…..?Hehasplayedbasketballsincehewasfiveyearsold.Hestartedplayingbasketballin1986.Howlong…..?成龙（JackieChan）wasborn:195
6、4act:1961~nowHowlonghasJackieChanacted?sinceIhavemade5goodfriendsheresince2013.Ihavemade5goodfriendsheresinceIenteredthemiddleschool.MsJinhastaughtusEnglishsinceweenteredthemiddleschool.Since接过去时间点Since引导时间状语从句For+时间段MsJinhastaughtusfornearly3years.Since&for1.Ihav
7、ebeenstudyinginthisschool____twoyears.2.Hedanced_____oneandahalfhoursyesterday.3.MissWanghastaughthere_____lastyear.5.ShehasbeenintheU.S.A_______sixyearsago.4.Hehaslivedhere________hewasborn.forforsincesincesinceJackisanAmericanboy,heisstudyinginBeijingnow.Hehasco
8、metoChinafortwoyears.helikesChineseculturesomuchthathehasborrowedmorethan10booksaboutChinesehistoryfromtheschoollibraryinthepastoneyear.AlthoughheleftAm
