现在完成时现在完成时:have/has+过去分词1)表示到现在为止已经完成或刚才完成动作。Nowwehaveplantedallthetrees.Hehasjustcomeback.2)表示过去发生动作,但强调结果或对现在影响。Haveyouhadyoursupper?Ihavereadthebooktwicealready.在以上两种使用方法中常跟already,not…yet,never,just,before,ever,recently等时间继续下去状语。3)表示过去已经开始,连续到现在,可能还会继续下去动作或状态，常与包含现在在内一段时间状语连用。HehasstudiedEnglishfor6years.MaryhasbeenbusysinceshecamebackfromHangzhou..过去分词组成现在完成时Presentperfect句型Ihavenot(haven’t)seenthefilm.I’vealreadyhaddinner.I________________dinner________.2.Hehasjustfinishedhishomework.He________________hishomework_________.3.Mum’scookedthedinner.Mum_______________thedinner.4.Susan’slearnedEnglishatschool.Susan________________Englishatschool.Haveyoueatenyourbreakfast?I’vealreadyhaddinner.2.Hehasjustfinishedhishomework.3.Mum’scookedthedinner.4.Susan’slearnedEnglishatschool.分清与普通过去时使用方法现在完成时属于现在时态范围，不能和表示过去时间状语连用，如yesterday,lastnight,threeweeksago,in1990等.而普通过去时只表示过去动作或状态，和现在不发生关系。eg---Ihaveseenthefilm.eg---Isawthefilmlastweek.eg---Hehaslivedheresince1993.eg----Helivedherein1993.Notes:1)havegoneto与havebeentohavegoneto表示某人已离开了原地，去了另外某地，说话时，人已不在原地。后者表示某人曾havebeento去过某地，说话时人已不在某地了。HehasbeentoXi‘antwice.他曾经去过西安两次。（已经回来了）Youcan’tfindhim.HehasgonetoXian.你找不到他。他去西安了。（没回来）动词填空：1._____you________(clean)theroom?Yes,we__________(do)thatalready.When_______you______(do)it?We_______(do)itanhourago.2.______he______(see)thisfilmyet?Yes.When_____he_____(see)it?He______itlastweek.3.Howmanytimes_____you______(come)here?Once.4.I_______(read)thenoveltwice.It’sinteresting.5.She_______(go)toPairs,hasn’tshe?Yes.How______she_______(go)there?She_______(go)therebyair.6.Sofar,manycountries______________(develop)theirsoftwareprograms.7.MrChen______(give)upsmokinglastyear.8.______youever_______(ride)ahorse?Never.9.He________(keep)thebooksincetwodaysago.I’vealreadyhaddinner.2.Hehasjustfinishedhishomework.3.Mum’scookedthedinner..4.Susan’slearnedEnglishatschool.（for+表示一段时间词组，since+表示过去某一时刻词或词组）谓语只可用延续性动词.练习题:1.It'salongtimesincewe____