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《一般过去时与现在完成时的区别课件.ppt》由会员上传分享，免费在线阅读，更多相关内容在教育资源-天天文库。
1、一般现在时与现在完成时的区别一般过去时的构成概念：过去某个时间里发生的动作或状态；过去习惯性、经常性的动作、行为。基本构成：主语+动词（包括be）的过去时常用的时间状语：yesterday,lastweek,anhourago,theotherday,in1982等具体时间状语。【注】不论是否定句还是一般疑问句，只要用了助动词，原句中的谓语动词的过去时都要还原成动词原形；主+系+表结构的句子，主语要和was和were在人称和数上保持一致。一般过去时的用法表示过去某一时刻或某段时间发生的动作或者存
2、在的状态。常与表示过去的时间状语连用。例如：Ilivedhere5yearsago.表示在过去一段时间内，经常性或习惯性的动作。例如：WhenIwasachild,Ioftenplayedfootballinthestreet.一般过去时的形式有时并不表示过去的动作而是只表示说话人的委婉语气。例如：couldyoutellmeyourname?现在完成时的构成概念：过去发生或已经完成的动作对现在造成的影响或结果，或从过去已经开始，持续到现在的动作或状态。基本结构：主语+have/has+过去分词
3、否定形式：主语+have/has+not+过去分词常用的时间状语：now,today,tonight,thisweek,thisyear,already,yet,just,since,recently,inthepastfewyears等等for和since的运用for表“经历(一段时间)”，而since表“自从……以来”。例如：1.He has stayed herefor 3 hours.2.He has stayed heresince 3 hours ago. 3.He has stay
4、ed heresince 3 o’clock.4.He has taught Englishsince he came here.Fillintheblankswith“for”or“since”:Wehavehadthenewcomputer_______aweek.HowlonghaveyoustudiedEnglish?IhavestudiedEnglish_______Iwasfive.3.Howlonghashetaughtinthisschool?Hehastaughtinthiss
5、chool______1998.4.Howlonghaveyouknowneachother?Wehaveknowneachother______overtenyears.5.Howlonghaveyoukeptyourpetdog?Ihavekeptit______twoyearsago.Ihavekeptit______twoyears.sincesinceforsinceforforJameshasbeeninCanada______Monday.JameshasbeeninCanada_
6、_____fourdays.JamescametoCanadafourdays_____.MyaunthaslivedinBrazil_____15years.MyauntmovedtoBrazil15years_____.ShehaslivedinBrazil______15years______.Mikehasbeeninhospital_______October.Mikehasbeeninhospital______twomonthsMikecametothehospitaltwomon
7、ths______Hehasbeeninhospital______twomonths___填上since,for或者ago.sinceforagoforagosinceagosinceforagosinceagoalready和yet的区别already常用于肯定句中或句末；yet常用于一般疑问句或否定句末。但表惊讶时already也可用于疑问句。例如：1.Tom has already finished his home-work.2. Tom hasn’t finished his hom
8、eworkyet. 3.What!Have you already finished it?Shallweeatlunch?Iam________hungry.Haveyoumetourforeignteacher_____?No,not______.Hasthebellrung_____?Yes,Ithas________rung.Thecomputerhasnotbeenrepaired____.Wehave_______changedtheplanbecauseLindahasn’tmad
