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

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Unit1TalesoftheunexplainedThedisappearanceofJustin(make)Kellyveryunhappy.I(notsee)JustinsincelastFridaynight1.We(study)Englishfor aboutfiveyears. 2.They(live)inthesouthsince theirdaughterwasborn. 3.I(read)yourarticlethree times.It’swellwritten. 4.Thestudent(finish)herhomeworkalready. 5.Eric(go)backtohishometowntoday. 6.Thepolice(justfinish)searchingthearea. Weusethepresentperfecttensewhentheexacttimeofanactionisnotclearorimportant.Weuseitwithtimeexpressionssuchas: alreadyeverforjustlatelyneverrecentlysinceyet Weusealreadyforaffirmativestatementsandyetfornegativestatements. Weusefor+aperiodoftimeandsince+apointintime.Hehasjustgoneout.(=Hewentoutafewminutesago.) Weusethepresentperfecttenseheretotellothersthatheisn’therenow. Ihavejustheardthenews.(NowIknowthenews.)Wecanalsousethepresentperfecttenseforrepeatedactions,thatis,weusethepresentperfecttensewiththetimeexpressionsonce/twice/threetimes…Tomhasrungupthreetimesthismorning.(Nowitisstillinthemorning.) Tomrangupthreetimesthismorning.(Nowitisnotstillinthemorning.) Lookatthefollowingsentencesandpointoutwhattenseortensesareusedinthemandthereasonswhytheyareused.4.Justinhasbeenawayfromhomefor severaldays.HedisappearedlastFriday. 5.Theyboughtthishousethreeyearsago andtheyhavelivedheresincethen. 6.Mybrotherwenttoseemygrandpalast week.Hehasvisitedhimthreetimesthis month.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.The