初中现在完成时讲解ppt

1、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刚完成的动作。nowwehaveplantedallthetrees.hehasjustcomeback.,2)表示过去发生的动作,但强调结果或对现在的影响。haveyouhadyoursupper?ihavereadthebooktwicealready.在以上两种用法中常跟already,notyet,never,just,before,ever,recently等时间继续下去的状语。,3)表示过去已经开始,持续到现在,也许还会继续下去的动作或状态，常与包括现在在内的一段时间的状语连用。hehasstudied

2、englishfor6years.maryhasbeenbusysinceshecamebackfromhangzhou.,过去分词的构成,1.直接加-ed。如：play-played2.以字母e结尾的直接加d。如：name-named3.以辅音字母加y结尾的，变y为i加ed。如：carry-carried4.重读闭音节且末尾只有一个辅音字母，双写这个辅音字母再加-ed。如：stop-stopped,现在完成时presentperfect句型,1.肯定句现在完成时的肯定句式是“have（has）过去分词”。注意：该句式中的have或has是助动词，has用于第三人称单数，其它人称一律用have

3、。2.疑问句现在完成时的一般疑问句式是把助动词have或has提到主语之前。（回答用“yes，have（has）“no，havent（hasnt）”）3.否定句：现在完成时的否定句式是“havent（hasnt）过去分词”。,ihaveeatenmylunch.,shehaseatenherlunch.,hehaseatenhislunch.,肯定句,theyhaveeatentheirlunch.,ihavenot(havent)seenthefilm.,shehasnot(hasnt)seenthefilm.,现在完成时的否定形式：havenot(havent)+过去分词hasnot(ha

4、snt)+过去分词,ihaventeatensupper.eat-eatenhehasntchangedhisidea.change-changedmymotherhasne-come,否定句,ivealreadyhaddinner.i_dinner_.2.hehasjustfinishedhishomework.he_hishomework_.3.mumscookedthedinner.mum_thedinner.4.susanslearnedenglishatschool.susan_englishatschool.,havent,had,yet,hasnt,finished,yet,ha

5、sntcooked,hasnt,learned,把下列句子改为否定句,haveyoueatenyourbreakfast?,现在完成时的一般疑问句形式have/has提前+过去分词,haveyouknownsandyforalongtime?yes,ihave/no,ihavent.know-knownhassheeatenanythingsince9:00a.m.yes,shehas/no,shehasnt.eat-eaten,疑问句,ivealreadyhaddinner.2.hehasjustfinishedhishomework.3.mumscookedthedinner.4.susa

6、nslearnedenglishatschool.,haveyoualreadyhaddinner?,hashejustfinishedhishomework?,hasmumcookedthedinner?,hassusanlearnedenglishatschool?,把下列句子改为一般疑问句,分清与一般过去时的用法现在完成时属于现在时态的范围，不能和表示过去的时间状语连用，如yesterday,lastnight,threeweeksago,in1990等.而一般过去时只表示过去的动作或状态，和现在不发生关系。eg-ihaveseenthefilm.eg-isawthefilmlastwe

7、ek.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。hehasbeentoxiantwice.他曾经去过西安两次。（已经回来了）youcantfindhim.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_(

8、do)it?we_(do)itanhourago.2._he_(see)thisfilmyet?yes.when_he_(see)it?he_itlastweek.3.howmanytimes_you_(come)here?once.,have,cleaned,havedone,did,do,did,has,seen,did,see,saw,have,come,4.i_(read)thenoveltwice.itsinteresting.5.she_(go)topairs,hasntshe?yes.how_she_(go)there?she_(go)therebyair.6.sofar,man

9、ycountries_(develop)theirsoftwareprograms.7.mrchen_(give)upsmokinglastyear.8._youever_(ride)ahorse?never.9.he_(keep)thebooksincetwodaysago.,haveread,hasgone,did,go,went,havedeveloped,gave,have,ridden,haskept,ivealreadyhaddinner.2.hehasjustfinishedhishomework.3.mumscookedthedinner.4.susanslearnedengl

10、ishatschool.,whathaveyoualreadydone?,whathashejustdone?,whohascookedthedinner?,wherehassusanlearnedenglish?,对划线部分提问,（for+表示一段时间的词组，since+表示过去某一时刻的词或词组）谓语只可用延续性动词.,eg.-ivelivedherefor15years.eg.-ivelivedheresince15yearsago(1990),选用for和since填空:1.wehaventseeneachother_alongtime.2.hisfatherhasbeeninthef

11、actory_10yearsago.3.thefilmhasbeenon_20minutes.4.mrgreenhasworkedhere_hecametochina.5.hisgrandparentshavebeendead_severalyears.6.itsfiveyears_wemetlasttime,for,since,for,since,for,since,练习题:1.itsalongtimesincewe_(meet)last,isntit?2.-iknowyou_(choose)apicturebookamongthese.-yes,havealookatit,please.3.sofar,spaceshipswithoutpeople_(reach)themoonandsomeotherpartsoftheuniverse.4.myfather_homeforn