四年级下册一般过去时态(一过)

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一般过去时态(一过)1.一过的定义、基本句型;2.如何把一过的肯定句变否、变疑?3.动词过去式变化规则及特殊的动词表示在过去某个时间发生的动作或存在的状态。含有be动词的一般过去时的肯定句。Ihe,she,it,单个人youwe,they,多个人be动词原形amisarearebe动词过去式waswaswerewere注:一般过去时常和表示过去的时间连用;如:yesterday(昨天),then(那时),last......(lastweek,lastyear)时标一般过去时:含有be动词的一般过去时变否定句。1、Iwasthinthen.(变否)Iwasnotthinthen.2、Theseboyswerenaughtythen.(变否)Theseboyswerenotnaughtythen.肯定句变否定句:主+was/werenot+其他.wasnot=wasn'twerenot=weren't含有Be动词的肯定句变一般疑问句:1、Iwasthinthen.(变疑)Wereyouthinthen?2、Theywerecutethen.(变疑)Weretheycutethen?含有Be动词的肯定句变一般疑问句:1.提:Be提前(大写)。2.变:人称变化(I/we变you,my,our变your)。3.问号:“.”变“?”。二、含有实义动词的一般过去时,描述过去发生的事:eg:Icookednoodlesyesterday.Werowedaboatonthelake.Shewashedclothesyesterday.结构:主语+动词过去式+其他.1.Hewasanaughtyboythen.(变否)Hewasnotanaughtyboythen.2.Theycanswim.(变否)Theycannotswim.如何将含有实义动词的一般过去时的肯定句变否定句?含有be动词或者情态单词can的肯定句,在be或can后+not变否定句:Ihelpedmum.(变否)Ididnot/didn'thelpmum.无be无情,必加助(do-did)变否助动词后加not,放动词前,动词记得变原型。变一般疑问句:Hehelpedmumyeaterday.(变一般疑问句)Didhehelpmumyesterday?口诀:1提(Did)2变(变人称I、we变you;my、our变your)3?(.变?)无be无情,必加助(do-did)变疑句首加Did动词记得变原型。注意:关于did,我们需要特别注意1.作为助动词eg:Hedidn'twatchTVyesterday.2.实义动词:做.....eg:Mymotherdidthehouseworklastnight.Ididmyhomeworkyesterday.动词过去式规则:1.一般动词,词尾+ed,如wash-washed,play-played,watch-watched2.以不发音e结尾的动词,词尾+d,如love-loved,dance-danced,phone-phoned3.以辅音字母+y结尾的,把y变i,再+ed,如carry-carried4.以元音字母+y结尾的,词尾+ed,(元音字母:aeiou)如stay-stayed5.以重读闭音节词结尾,末尾只有一个辅音结尾,双写词尾辅音字母,再+ed如,stop-stopped,travel-travelled6.不规则动词变化如do/does-did,go-went,have-had,see-saw,eat-ate,read-read,make-made,find-found,buy-bought,come-camerun-ran,swim-swam,drink-drank,take-took,sing-sang

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