Someoneshothismother3yearsago.1.构成：主语＋V(过去式)Hisbrotherwascagedlastyear.Someonekilledhisfatherin1990s.一般过去时Hisfriendsfellintoatrapyesterday.Unit3基础提高与扩展---+ed，---去掉e，＋ed(词尾不发音的e)---重读闭音节或-r音节结尾，末尾只有一个辅音字母(x除外)，双写末位辅音字母，＋ed---改词尾y为i，＋ed2．过去式的四种构成方法改双去直work;stay;wanthope;believestop;admit;referstudy，tryworked;stayed;wantedhoped;believedstopped;admitted;referredstudied;triedcutcutcut;putputputburnburntburnt;hearheardheardeatateeaten;fallfellfallencomecamecome;runranrun特殊：不规则动词A-A-A型:A-B-B型:A-B-C型:A-B-A型:A-A-A型常见不规则动词变化表hithithitputputputreadreadreadhurthurthurtletletletcostcostcostovercomeovercameovercomeAAB型beatbeatbeatenABA型becomebecamebecome1burnburntburntlearnlearned/learntlearned/learntmeanmeantmeanthearheardheardbuildbuiltbuiltlendlentlentsendsentsentspendspentspentABB型ABC型eatateeatenfallfellfallengivegavegiventaketooktakenseesawseenwritewrotewrittenrideroderiddendrivedrovedriventhrowthrewthrownblowblewblowngrowgrewgrownknowknewknownshowshowedshowndrawdrewdrawnpemitcalllivelikeneedstarcarrystephelpprefercry动词原形过去式过去分词中文costcuthitletputreadhurt1.A---A---A型（现在式、过去式和过去分词同形）动词原形过去式过去分词中文beat2.A---A---B型（现在式和过去式同形）2动词原形过去式过去分词中文comebecomerun3.A---B---A型（现在式和过去分词同形）burnlearnmeanhear4.A---B---B型（过去式和过去分词同形）（1）在动词原形后加一个辅音字母d或t构成过去式或过去分词。动词原形过去式过去分词中文eatfallstealgivefreezetakesee5.A---B---C型（现在式、过去式和过去分词都不相同）（1）在动词原形后加-n或-en构成过去分词。动词原形过去式过去分词中文定义：A．过去某个时间里发生的动作B．过去经常性/习惯性的动作3．定义：4．标志词：•yesterdaymorning/afternoon/evening•lastweek/month/year…•threeweeks/months/yearsago…•in2009/2008/1986/1220…•whenIwasachild…昨天上个XX前，in加年份when字连Peoplekilledabout1700tigersinChinain1950s.3Peoplekilledabout1700tigersinChinain1950s.1．改为否定句2...
