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时间:2020-04-10
《高中英语 Unit3 Grammar课件 牛津版必修3.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、Unit3BacktothepastGrammarPresentperfecttenseGooverthenewsstoryonPage2andfindthesentencesusingthepresentperfecttense.Pleaseexplainwhythetenseisusedinthesesentences.ThedisappearanceofJustin(make)Kellyveryunhappy.hasmadeWeusethepresentperfecttensetotalkaboutthingsthathappenedint
2、herecentpast,butareconnectedtothepresent.TheusesofthepresentperfecttenseI(notsee)JustinsincelastFridaynight.havenotseenWealsousethepresentperfecttensetotalkaboutsomethingthatstartedinthepast,andisstillhappeningnow.Completethefollowingsentenceswiththepropertense.1We(study)Engli
3、shforaboutfiveyears.2They(live)inthesouthsincetheirdaughterwasborn.3I(read)yourarticlethreetimes.It’swellwritten.4Thestudent(finish)herhomeworkalready.5Eric(go)backtohishometowntoday.6Thepolice(justfinish)searchingthearea.havestudiedhavelivedhavereadhasfinishedhasgonehavejustf
4、inishedWeusethepresentperfecttensewhentheexacttimeofanactionisnotclearorimportant.Weuseitwithtimeexpressionssuchas:alreadyeverforjustlatelyneverrecentlysinceyetalready,yet;for,sinceWeusealreadyforaffirmativestatementsandyetfornegativestatements.Weusefor+aperiodoftimeandsince+a
5、pointintime.Hehasjustgoneout.(=Hewentoutafewminutesago.)Weusethepresentperfecttenseheretotellothersthatheisn’therenow.Ihavejustheardthenews.(NowIknowthenews.)Weusethepresentperfecttensetotalkaboutactionsthatwerecompletedonlyashorttimeago.Inthiscase,justisused.Payattentiontothe
6、positionofjust.Wecanalsousethepresentperfecttenseforrepeatedactions,thatis,weusethepresentperfecttensewiththetimeexpressionsonce/twice/threetimes…Tomhasrungupthreetimesthismorning.(Nowitisstillinthemorning.)Tomrangupthreetimesthismorning.(Nowitisnotstillinthemorning.)Actionsoc
7、curringinanincompleteperiodmightbeindicatedbytodayorthismorning/afternoon/evening/week/month/year/centuryorallday/night/week,allthetime,alwaysetc.Lookatthefollowingsentencesandpointoutwhattenseortensesareusedinthemandthereasonswhytheyareused.1WehavestudiedEnglishforaboutfiveye
8、ars.Webegantostudyitfiveyearsago.2Theymovedtothesouthin1990an
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