PresentPerfectPresentPerfectTenseTense((现在完成时))一、什么叫现在完成时1.IhavejustlentmybooktoJohn.(Idon’thavethebooknow.)现在完成时表示动作发生在过去，但和现在情况有关，既用一个发生在过去的动作来说明现在的情况。2.Myunclehaslivedinthatstreetsincehecametothiscity.(Hebegantolivetheremanyyearsago,helivestherenowandhewillgoonlivingthere.)Exercises:一、按要求变化下列各句。1.Shehaslistenedtoapieceofforeignmusic.（否定句）2.Ihavegotsomethingimportanttodo.（一般疑问句）3.Haveyouevertraveledonatrain?（否定回答）Shehasn’tlistenedtoapieceofforeignmusic.Haveyougotanythingimportanttodo.No，Ihaven't4.Hefinishedreadingastory-book.（改成现在完成时）5.LiLeihaseatensomedumplingsforhisbreakfast.（对划线问）6.I’veworkedoutthemathsproblem.（对划线部分提问）Whohasworkedoutthemathsproblem?WhathasLileieatenforhisbreakfast?.Hehasalreadyfinishedastorybook.构成have/has+动词过去分词hadbreakfastI’mnothungrynow用法一：表示过去发生或已经完成的动作对现在造成的影响或结果。nowpastIhaveeverhadmybreakfast.(现在我不饿)时间状语：ever,never,just,already,yet,before，twice,during/overthe…years二、用所给动词的适当形式填空。1.--Areyousureyou________(lose)thebook?•--Yes.I_________(look)foriteverywhere.ButIstill_______(cannot)findit.2.--_______you_________(take)themedicineyet?•--Yes,I_________(take)ithalfanhourago.3.I_____________(never,meet)hersisterbefore.4.He______________(just,watch)afootballgame.Heissotiredandhungrynow.5.--Howmanytimes________you________(read)thisbook?•--I_________(read)itseveraltimes.havelosthavelookedcan’tHavetakentookhavenevermethasjustwatchedhavereadhaveread6.Mybrother________(buy)acarlastmonth.7.--WhereisJoan?--She_________(go)tothecinema.8.Youcanturnofftheradionow.I__________(hear)thenewsalready.I________(hear)itat8o’clock.9.Jack___________(notfind)hiswatchyet.10.--_________WeiFang________(come)yet?--Yes,she_________(come)already.--When________she_________(come)?--She________(come)justnow.boughthasgonehaveheardheardhasn’tfoundHascomehascomedidcomecamemovedherein2000Istillliveherepastnow用法二：表示开始于过去并持续到现在的动作或状态。for+一段时间一段时间+agoSince+时间的点主语+谓语（过去式）（动词多为延续性动词）Ihavelivedhereforeightyears.Ihavelivedheresince2000.Ihavelivedheresinceeightyearsago.forsincesinceagosince和for:1)EddiehaslivedwithMilliesince2001.EddiehaslivedwithMilliesince4yearsago.EddiehaslivedwithMilliesincehewasborn.小结:since+时间点（词、词组或句子）2)EddiehaslivedwithMillieforfouryears.小结:for+时间段3)对以上句子划线部分提问:HowlonghasEddielivedwithMillie?1.WehavelearnedEnglish______GradeThreeinprimaryschool.WehavelearnedEnglish_______fiveyears.2.Hehasn’tfeltwell________lastnight.Hasheseenthedoctor?3.Ihavereadthisstorybook_______threedaysago.Ihaven’tfinishedreadingityet.选用since或for填空:sinceforsincesince4.Ithassnowed______twodays.Everythingiscoveredwithsnow.5.Wehavecleanedtheclassroom______halfanhour.6.Wehavestudiedatthisschool____2003.forforsince非延续性动词与现在完成时非延续性动词在肯定句、疑问句中不能与for,since,howlong等时间段连用，这些动词是：begin/start,buy,borrow,arrive,come/go,die,getmarried,join,leave,stop等。为了表述这种意思，我们常用相应的延续性动词have，keep等来代替非延续性动词。Forexample:1.KittyhasleftBeijingfortwodays.×KittyhasbeenawayfromBeijingfortwodays.leavehave/hasbeenaway常见非延续性动词和延续性动词的转变常见非延续性动词和延续性动词...
