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时间:2020-03-31
《高中英语 Unit3 Amazing people-grammar and usage精品教案 牛津译林版必修2.doc》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、●GrammarandUsageHerewewilllearntorecognizesituationswherethepastperfecttenseisusedandthetimeexpressionsusedtogetherwiththetense.Wewillalsoseehowthetenseisformed.Youwillreadtwostoriesandcompletethemusingthecorrectverbforms.Payattentiontothedifferencesbetweenthepastperfecttenseandthes
2、implepasttense.Step1:PastperfecttensePastperfecttenseisusedtoindicatethatoneactionoccurredbeforeanotheractioninthepast.Inotherwords,pastperfecttenseindicatesthefirstofthetwoactions.FormofPastPerfect[had]+[pastparticiple]Examples:IhadstudiedalittleEnglishwhenIcametotheU.S.Theyhadneve
3、rmetanAmericanuntiltheymetJohn.-9-用心爱心专心-9-用心爱心专心Note:WhenyouareusingaverbtensewithmorethanonepartsuchasPastPerfect(hadmet),adverbsoftencomebetweenthefirstpartandthesecondpart(hadnevermet).USE1CompletedActionBeforeSomethinginPastThePastPerfectexpressestheideathatsomethingoccurredbef
4、oreanotheractioninthepast.Itcanalsoshowthatsomethinghappenedbeforeaspecifictimeinthepast.Examples:IhadneverseensuchabeautifulbeachbeforeIwenttoKauai.HadyouevervisitedtheU.S.beforeyourtripin1992?Yes,IhadbeentotheU.S.oncebeforein1988.USE2DurationBeforeSomethinginthePast(Non-continuous
5、Verbs)WithNon-progressiveVerbsandsomenon-progressiveusesofMixedVerbs,weusethePastPerfecttoshowthatsomethingstartedinthepastandcontinuedupuntilanotheractioninthepast.Examples:Wehadhadthatcarfortenyearsbeforeitbrokedown.BythetimeAlexfinishedhisstudies,hehadbeeninLondonforovereightyear
6、s.IMPORTANTSpecificTimeswiththePastPerfectUnlikethePresentPerfect,itispossibletousespecifictimewordsorphraseswiththePastPerfect.Althoughthisispossible,itisusuallynotnecessary.-9-用心爱心专心EXAMPLE:ShehadvisitedherJapaneserelativesoncein1993beforeshemovedinwiththemin1996.IfthePastPerfecta
7、ctiondidoccurataspecifictime,theSimplePastcanbeusedinsteadofthePastPerfectwhenbeforeorafterisusedinthesentence.ThewordsbeforeandafteractuallytellyouwhathappensfirstsothePastPerfectisoptional.Bothsentencesbelowarecorrect.EXAMPLE:ShehadvisitedherJapaneserelativesoncein1993beforeshemov
8、edinwiththemin1996.
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