英语：Grammar and Usage课件(新人教版必修1).ppt

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1、GrammarandusagePresentPerfectTense现在完成时&PresentPerfectContinuousTense现在完成进行时Form:have/has+donePresentPerfectTensePartATheboyisveryhappy.Theboy___________(catch)abird.(Connectionwiththepast:Theboycaughtabird.Connectionwiththepresent:Theboyishappy.)hascaughtLook,thewindowisopen.Ericope

2、nedthedoorjustnow.Eric___________________(alreadyopen)thewindow.(Connectionwiththepast:Ericopenedthewindow.Connectionwiththepresent:Thewindowisopen.)hasalreadyopenedWeusethepresentperfecttensetotalkaboutthingsthathappenedintherecentpast,butareconnectedtothepresent.Summary(1):haslived

3、Daniel__________(live)inBeijingsincehecametoChina.(Connectionwiththepast:DanielcametoChina.Connectionwiththepresent:DanielislivinginChina.)Weusethepresentperfecttensetotalkaboutsomethingthatstartedinthepast,andisstillhappeningnow.camehaslived________________________________pastnowfut

4、ureSummary(2):Theboysaretired.They_____________(justplay)aballgame.(Connectionwiththepast:Theboysplayedaballgame.Connectionwiththepresent:Theboysaretired.)hasjustplayedWeusethepresentperfecttensetotalkaboutactionsthatwerecompletedonlyashorttimeago.Summary(3):IwenttoEgyptin1986.Iwentt

5、oEgyptin2004.I__________(be)toEgypttwice.havebeenWecanalsousethepresentperfecttenseforrepeatedactions.Summary(4):______itever_______(snow)inHongKong?No,it_______never_________(snow)there.HassnowedhassnowedWeusethepresentperfecttensewhentheexacttimeofanactionisnotclearorimportant.Weus

6、eitwithtimeexpressionssuchas:already,ever,for,just,lately,never,recently,since,yetSummary(5):Weusealreadyforaffirmativestatementsandyetfornegativestatementsandinterrogativesentences.2.Weusefor+aperiodoftimeandsince+apointoftime.3.Structuresconnectedwiththepresentperfecttense:1)Itis(h

7、asbeen)+aperiodoftime+since-clause.2)This(That/It)isthefirst(second…)time+that-clause(presentperfecttense).3)This(That/It)istheonly…+that-clause(presentperfecttense).4)This(That/It)isthebest/finest/mostinteresting…+that-clause.Notes:Exercises:MyfriendJackhasjustsentmeane-mail,telling

8、meabouthistr