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高中英语Unit1《Talesoftheunexplained》Grammarandusage课件2牛津译林版必修2.ppt

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Unit1TalesoftheunexplainedThedisappearanceofJustin(make)Kellyveryunhappy.I(notsee)JustinsincelastFridaynight1.We(study)Englishforaboutfiveyears.2.They(live)inthesouthsincetheirdaughterwasborn.3.I(read)yourarticlethreetimes.It’swellwritten.4.Thestudent(finish)herhomeworkalready.5.Eric(go)backtohishometowntoday.6.Thepolice(justfinish)searchingthearea.Weusethepresentperfecttensewhentheexacttimeofanactionisnotclearorimportant.Weuseitwithtimeexpressionssuchas:alreadyeverforjustlatelyneverrecentlysinceyetWeusealreadyforaffirmativestatementsandyetfornegativestatements.Weusefor+aperiodoftimeandsince+apointintime.Hehasjustgoneout.(=Hewentoutafewminutesago.)Weusethepresentperfecttenseheretotellothersthatheisn’therenow.Ihavejustheardthenews.(NowIknowthenews.)Wecanalsousethepresentperfecttenseforrepeatedactions,thatis,weusethepresentperfecttensewiththetimeexpressionsonce/twice/threetimes…Tomhasrungupthreetimesthismorning.(Nowitisstillinthemorning.)Tomrangupthreetimesthismorning.(Nowitisnotstillinthemorning.)Lookatthefollowingsentencesandpointoutwhattenseortensesareusedinthemandthereasonswhytheyareused.4.Justinhasbeenawayfromhomeforseveraldays.HedisappearedlastFriday.5.Theyboughtthishousethreeyearsagoandtheyhavelivedheresincethen.6.Mybrotherwenttoseemygrandpalastweek.Hehasvisitedhimthreetimesthismonth.ThepresentperfecttenseandthepastsimpletenseThepresentperfecttenseisnormallyusedforanactionwhichlaststhroughoutanincompleteperiod,butwiththepastsimpletense,weusetimeexpressionswhichafixedpointinthepast.Sometimes,however,theactionfinishesatthetimeofspeaking.Ithasbeenverycoldlatelybutit’sjustbeginningtogetwarmer.Onmeetingsomeone,youmaysay:Ihaven’tseenyouforages.(ButIseeyounow.)1Tomhashadabadcarcrash.(He’sprobablystillinhospitalnow.)Tomhadabadcarcrash.(Buthe’sprobablyoutofhospitalnow.)2Thelifthasbrokendown.(Wehavetousethestairs.)Theliftbrokedown.(Butit’sprobablyworkingagainnow.)Readthediaryentryandthencompleteitusingthecorrectformsoftheverbsinbrackets.TheusesofthePresentperfectcontinuo