现在完成时讲解ppt课件.ppt

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1、ThePresentPerfecttensepresent(now)futurepastPresentPerfectTense现在完成时主语+have/has+过去分词（pp）助动词,无意义现在完成时的结构Winterhasalreadycome，willitstillbefarinspring?主语+have/has+过去分词（pp）否定形式haven’t(havenot）+过去分词hasn’t(hasnot)+过去分词疑问句把助动词have/has放在句首现在完成时的结构注：主语若是第三人称单数助动词用hasYouhaveplantedallthetrees.Ihavep

2、lantedallthetrees.He/shehasplantedallthetrees.Theyhaveplantedallthetrees.区别have和has的用法主语若是第三人称单数助动词用has1)表示到现在为止已经完成或刚刚完成的动作。Nowwehaveplantedallthetrees.Hehasjustcomeback.Theyhavebuiltmanybuildingsinthiscity.现在完成时的用法2)表示过去发生的动作,强调结果或对现在的影响。Someonehasbrokenthewindow.(窗户现在是坏的)Ihavealreadylost

3、thekey.(我现在没有钥匙)Ihaven’treadthatbookyet.(不了解书的内容)Ihavejustcleanedmyhands.(手是干净的)常与already(已经),yet(已经),just(刚刚),ever(曾经)等词连用.already:常用于肯定句中.yet:常用于否定句,疑问句尾.3)表示从过去开始并持续到现在的动作或状态，常与包括现在在内的一段时间的状语连用。ShehaslearnedEnglishfor5years.HehaslivedinBeijingsince5yearsago.since:(自…以来)1)since+时间点He has 

4、stayed heresince 5 o’clock.2)since+时间段+agoHe has stayed heresince 5 hours ago.3)since+从句She has taught Englishsince he came here.for:(长达）for+时间段Hehaskeptthebookfor2weeks.since,for的用法:Takenotes用for或since填空Mr.BrownhashadhisTV______15years.I’vetakendrivinglessons_______lastmonth.Mysisterhashad

5、hercellphone______amonth.Myfriendshaven’tvisitedme______fewdaysago.Wehaven’tusedourcar_____alongtime.Shehasn’thadagoodcupofcoffee_____years.Tomhaswornglasses_______hewas7yearsold.forsinceforsinceforforsince注：并非所有for作为时间状语的句子都用现在完成时搞清一般过去时和现在完成时的区别Iworkedhereformorethantwentyyears.(我现在已经不在这里

6、工作了)Ihaveworkedhereformorethantwentyyears.（现在我仍在这里工作）疑难点辨析havebeento和havegonetoMyfatherhasgonetoShanghaiforameeting.他（已经）去了上海。MyfatherhasbeentoShanghaiforameeting.他（曾经）去了上海。ShehasbeentoChina.她（曾经）去过中国。（人已经回来了）havebeentosomeplace.曾经去过某地，已经回来．hasgonetosomeplace.某人去了某地，还没有回来．ShehasgonetoChinal

7、astweek.上周她去了上海。（人可能回来了也可能没回来）用have/hasbeento,have/hasgoneto填空：1.—Whereisyourbrother?—He____________theshop.He’llbebacksoon.2.—______youever_________toAmerica?—Yes,I___________NewYorktwice.3.—Hereyouareatlast!Where_____you_____?—I_____________London.4.—D