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1、TalesoftheunexplainedUnit1Grammarandusage現(xiàn)在完成時態(tài)have/has+過去分詞PresentperfecttenseThestructureofthePresentPerfectTenseis:subjectaux.vmainv+IhaveseenET.+Youhaveeatenmine._ShehasnotbeentoRome._Wehavenotplayedfootball.?HaveyoufinishedIt??HashedoneIt?通常使用現(xiàn)在完成時的幾種情況：1表示發(fā)生在過去對現(xiàn)在仍有影響的動作。Wehavealr
2、eadycleanedtheclassroom.ThedisappearanceofJustinhasmadeKellyveryunhappy.Ihavealreadyreadthebook.Theboyhascomeback.2.表示一個剛剛完成的動作TheyhavejustreturnedfromFrance.3表示過去發(fā)生反復(fù)多次的動作。ThecityisveryfamiliartomebecauseIhavevisitedittwice.Youdon’tneedtodescribeher,forIhavemetherseveraltimes.Thismonth
3、IhavebeentoBeijingfor5times.常與twice,threetimes等連用4表示過去開始的動作或狀態(tài)一直延續(xù)到現(xiàn)在表示動作只能用于某些帶有延續(xù)意義的動詞。Shehastaughtheresincetenyearsago.Since1949,Chinesepeoplehavelivedabetterlife.Wehavebeeninthisschoolfor3months.WehavelearnedEnglishfor10years.瞬間動作要用否定式才能延續(xù)Ihaven’tseenherfor3years.Ihaven’tseenhersinc
4、elastyear.since+時間點(diǎn)for+時間段thesedaysrecentlysofarinthepastfewyearslatelybynow延續(xù)性與非延續(xù)性動詞：判斷正誤：延續(xù)性動詞常與for,howlong,since等引導(dǎo)的表示一段時間的狀語或狀語從句連用。一些非延續(xù)性動詞如come,go,leave,die,join,marry等用于現(xiàn)在完成時，一般不可以與表示一段時間的時間狀語連用，此時應(yīng)改為意義相近的延續(xù)性動詞來表達(dá)。1Hehasdiedfor3years.2Hehasbeendeadfor3years.3Hedied3yearsago.4Ith
5、asbeen3yearssincehedied.5Howlonghaveyouborrowedit?FTTTFkept注意：非延續(xù)性動詞的否定形式可以與表示延續(xù)時間的狀語連用。即動作不發(fā)生的狀態(tài)是可以持續(xù)的。判斷正誤：（）Ihavereceivedhisletterforamonth.（ ?。㊣receivedthisletteramonthago.（）Ihaven'treceivedhisletterforalmostamonth.錯對對1.I’llgiveyouthebookassoonasI______________(finish)it.2.Ifyou____
6、_________(see)thefilm,youwilllikeit.3.I’llgotothepartyassoonas(orwhen)I_____________(finish)myhomework.havefinishedhaveseen5.在時間或條件從句中表示在將來某個時間前要完成某個動作havefinished1We_____________(study)Englishforaboutfiveyears.2They______________(live)inthesouthsincetheirdaughterwasborn.3I___________(r
7、ead)yourarticlethreetimes.It’swellwritten.4Thestudent_________________(finish)herhomeworkalready.5Thepolice____________________(justfinish)searchingthearea.havestudiedhavelivedhavereadhasfinishedhavejustfinished現(xiàn)在完成時的時間標(biāo)志1不表示具體或確定時間的一些狀語往往可成為現(xiàn)在完成時的標(biāo)志。（1）already和yetalready一般用于肯定
