四年级下册一般过去时态(一过).pptx
一般过去时态(一过)一般过去时态(一过)1.一过的定义、基本句型;一过的定义、基本句型;2.如何把一过的肯定句变否如何把一过的肯定句变否 、变疑、变疑?3.动词过去式变化规则及特殊的动词动词过去式变化规则及特殊的动词 一般过去时:一般过去时: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,单个人个人youwe,they,多个人多个人be动词原形原形amisarearebe动词过去式去式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.(last week,last year)时标一般过去时:一般过去时:含有含有be动词的一般过去时变动词的一般过去时变否否定句。定句。1、I was thin then.(变否)(变否)I was not thin then.2、These boys were naughty then.(变否)(变否)These boys were not naughty then.肯定句变否定句:主肯定句变否定句:主+was/were not+其他其他.was not=wasnt were not=werent 含有含有Be动词的动词的肯定句肯定句变变一般疑问句一般疑问句:1、I was thin then.(变疑变疑)Were you thin then?2、They were cute then.(变疑变疑)Were they cute then?含有含有Be动词的肯定句变一般疑问句:动词的肯定句变一般疑问句:1.提:提:Be 提前提前(大写大写)。2.变变:人称变化(人称变化(I/we变变you,my,our 变变your)。)。3.问号问号:“.”变变“?”。二、含有实义动词的一般过去时,二、含有实义动词的一般过去时,描述描述过去过去发生的事:发生的事:eg:I cooked noodles yesterday.We rowed a boat on the lake.She washed clothes yesterday.结构:主语结构:主语+动词过去式动词过去式+其他其他.1.He was a naughty boy then.(变否)He was not a naughty boy then.2.They can swim.(变否)They can not swim.如何将含有如何将含有如何将含有如何将含有实义动词实义动词实义动词实义动词的一般过去时的的一般过去时的的一般过去时的的一般过去时的肯定句变肯定句变肯定句变肯定句变否否定句定句定句定句?含有含有 be动词或者情态单词动词或者情态单词can的肯定句的肯定句 ,在在be或或can后后+not 变否定句:变否定句:I helped mum.(变否)变否)I did not/didnt help mum.无无be 无情,必加助(无情,必加助(do-did)变否变否助动词后助动词后加加not,放动词前,放动词前,动词记得变原型。动词记得变原型。变一般疑问句:变一般疑问句:He helped mum yeaterday.(变一般疑问句)变一般疑问句)Did he help mum yesterday?口诀:口诀:1提(提(Did)2变(变人称变(变人称 I、we变变you;my、our变变your)3?(?(.变变?)无无be 无情,必加助(无情,必加助(do-did)变疑句首加变疑句首加Did动词记得变原型。动词记得变原型。注意:关于注意:关于did,我们需要特别注意,我们需要特别注意1.作为作为助动词助动词 eg:He didnt watch TV yesterday.2.实义动词:做实义动词:做.eg:My mother did the housework last night.I did my homework yesterday.动词过去式动词过去式规则规则:1.一般动词,词尾一般动词,词尾+ed,如如wash-washed,play-played,watch-watched2.以不发音以不发音e结尾的动词,词尾结尾的动词,词尾+d,如如love-loved,dance-danced,phone-phoned3.以以辅辅音字母音字母+y结尾的,结尾的,把把y变变i,再,再+ed,如如 carry-carried4.以以元元音字母音字母+y结尾的,词尾结尾的,词尾+ed,(元音字母:(元音字母:a e i o u)如如 stay-stayed 5.以重读闭音节词结尾,末尾只有一个辅音以重读闭音节词结尾,末尾只有一个辅音 结尾,结尾,双写词尾辅音字母,再双写词尾辅音字母,再+ed如,如,stop-stopped,travel-travelled6.不规则动词变化不规则动词变化如如do/does-did,go-went,have-had,see-saw,eat-ate,read-read,make-made,find-found,buy-bought,come-came run-ran,swim-swam,drink-drank,take-took,sing-sang