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现在完成时thePresentPerfectTensehave/has+动词的过去分词或have/hasdone现在完成时的用法：1.表示已完成的某一动作对现在造成的影响或结果1）标志词:already:yet:多用于陈述句，位于have/has后，有时位于句末。e.g.Ihavealreadyfinishedmyhomework.用于疑问句和否定句，位于句尾。e.g.Haveyoufoundyourlostbookyet?Ihaven'thadbreakfastyet.ever:never:多用于疑问句，问初次经历。e.g.HaveyoueverbeentoBeijing?用于否定句，位于have/has后e.g.Hehasneverarguedwithotherpeople.2.表示从过去已经开始，持续到现在的动作或状态。标志词:1）for+一段时间e.g.Wehavelivedinthiscityfortenyears.2）since+过去点时间since+一段时间+agosince+从句（从句用一般过去式）e.g.Hehasworkedheresince1990.Shehastaughtinthisschoolsincetwoyearsago.Wehaveknowneachothersincewemet.Howlongjust:before:多用于陈述句，位于have/has后e.g.Lucyhasjustwashedherclothes.可用于各句式，位于句尾。e.g.Ihavereadthisbookbefore.Hehasn'tbeenabroadbefore.HaveyouflowntoHainanbefore?2）无标志词的：e.g.Heisnotfeelingwellnow.Hehascaughtacold.Ihavelostthekey.Ican'tgointomyroom.3）sofar,once/twice/threetimes,allone'slifee.g.Theyhavelearnt2000wordssofar.Tomhasseenthefilmtwice.Herfatherhasworkedinthefactoryallhislife.4）inthepast+一段时间duringthelast+一段时间e.g.Theyhavebuiltmanyhighbuildingsinthepastthreeyears.Greatchangeshavetakenplaceinmyhometownduringthelasttwoyears现在完成时的构成：have/has+动词的过去分词注：动词过去分词的构成分为规则变化和不规则变化，规则变化的动词过去分词与过去式是一样的，不规则变化的动词须特殊记忆。规则动词过去分词的构成1.一般在动词后直接加-ed构成规则2.以不发音的e结尾的动词，直接加-d3.末尾只有一个辅音字母的重读闭音节词，先双写这个辅音字母，再加-ed4.结尾是“辅音字母+y”的动词，先变“y”为“i”再加-ed例词looklookedplayplayedlivelivedhopehopedstopstoppedplanplannedstudystudiedcarrycarried写出下列动词的过去分词：worklikecrystaylearnusehelpfinishcookarriveworkedlikedcriedstayedlearnedusedhelpedfinishedcookedarrived１.肯定句：主语＋have/has+过去分词＋其他成分。现在完成时态的句式：２.否定句：主语＋have/has+not+过去分词＋其他成分。3.一般疑问句：Have/Has+主语＋过去分词＋其他成分？4.特殊疑问句：特殊疑问词＋have/has＋其他成分？肯定句：Ihavecleanedmybedroom.否定句：Ihaven’tcleanedmybedroom.一般疑问句：Haveyoucleanedyourbedroom?特殊疑问句：Whathaveyoudone?不规则动词过去分词的构成1.三个主要动词is,ambearewaswerebeenhave/hashadhaddo/doesdiddone2.AAA型（三者一致）cutcutcutletletletputputputcostcostcostreadreadreadbeatbeatbeathurthurthurt3.ABA型（过去分词与原形一致）comecamecomebecomebecamebecomerunranrun4.ABB型（过去分词与过去式一致）bringbroughtbroughtfindfoundfoundhearheardheardkeepkeptkeptmakemademade此外还有babysit，build，buy，catch，feed，feel，fight，forget，hang，hold，lay，learn，leave，lie，lose，mean，meet，pay，say，,sell，send，show，sit，sleep，spell，spend，stand，sweep，teach，tell，think,win等等。5.ABC型（三者不一致）eatateeatengivegavegivenwritewrotewrittenseesawseengetgotgottenbeginbeganbegun此外还有go,take,know,speak,swim等等。3.have/hasbeentohave/hasgonetohave/hasbeenin曾经去过某地，现不在那里了到某地去了，现已在那里或在途中在某地呆了多长时间1.A:Where’sJim,LiLei?B:He______________hisschoollibrary.2.TheGreens_____________Chinaforthreeyears.3.We_____________theGreatWalltwice.It’sverybeautiful.hasgonetohavebeeninhavebeento翻译下列句子她曾经去过上海。ShehasbeentoShanghaibefore.他在上海10年了。HehasbeeninShanghaifortenyears他去上海了。Hehasgo...