小学英语四种时态语法讲解.ppt
四种时态讲解,小学的时态分几种？,一、现在进行时（四年级下）二、一般现在时（五年级上）三、一般将来时（五年级下）四、一般过去时（五年级下）,过去,现在,将来,一般过去时,一般现在时,现在进行时,一般将来时,时间轴,一、一般过去时,1、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。2、标志词：1）yesterday或以其构成的短语：yesterday morning(afternoon,evening)等；2)由“last+一时间名词”构成的短语：last night,last year(winter,month,week)等；3)由“时间段+ago”构成的短语：long long ago，a moment ago,a short time ago,three days ago等；4)其它：just now等,一般过去时,3、基本结构：,be动词（注意be的人称变化，单数用was，复数用were）I was in the classroom yesterday morning He was in the classroom yesterday morningThey were in the classroom yesterday morning行为动词（动词过去式规则变化和不规则变化）I visited my grandparents yesterday.,1）动词过去式规则变化,2）动词过去式不规则变化要牢记：,am,is-was are-were do-did see-saw,say-said give-gave get-got go-went come-came have-had,eat-ate take-took,run-ran,sing-sang put-put,make-made,read-read write-wrote,draw-drew,drink-drank,fly-flew,ride-rode speak-spoke sweep-swept,buy-bought swim-swam,sit-sat bringbrought can-could cut-cut become-became begin-began draw-drew feel-felt find-found forget-forgot hear-heard keep-kept know-knew learn-learnt（learned）leave-left let-let lose-lostmeet-met sleep-slept teach-taught tell-told write-wrote think-though,二、一般现在时,一般现在时：1、概念：经常、反复发生的动作或行为及现在的某种状况。2、标志词：always,usually,often,sometimes,every week(day,year,month),on Sundays,etc.3、基本结构：be动词(is/am/are)；行为动词(基本用原形，但主语三单动词要加s/es)e.g：I am a teacher.(现在的状态)He goes to school every day.Katie often has breakfast at 7:15.The earth moves around the sun.(科学事实或真理),一般现在时常以动词原形表示，但当主语是第三人称时，谓语动词要用第三人称单数形式，加-s/es。,动词第三人称变化规则：,三、现在进行时,现在进行时,1、概念：现在（说话的瞬间）正在进行或发生的动作，强调“此时此刻”。2、标志词：look 看；listen听；now现在；3、基本结构：be+动词ing（也叫现在分词）（主语不同，be的形式也不同）Look！It is raining outside.Listen!She is singing an English song.We are reading storybooks now.,现在分词的变法规律：,1、一般在动词词尾加上-ing,E.g.jump-jumping2、以不发音字母e结尾的动词，先去e，再加-ing.have-having/write-writing/dance-dancing/take-taking/make-making/come-coming3、重读闭音节结尾的词，双写尾字母，再加上-ing.sit sitting/put-putting/swim-swimming/run-running/skip-skipping/hop-hopping,四、一般将来时,一般将来时,1、概念：表示将要发生的动作或存在的状态及打算、计划或准备做某事。2、标志词：tomorrow,next day(week,month,year),soon,the day after tomorrow（后天）等。3、基本结构：1）be going to+动词原形；（be有人称变化）2）will+动词原形.3）shall 动词原形（第一人称）Im going to have a picnic this weekend.Tomorrow will be Mid-Autumn Festival.We will eat mooncakes.,口头小结一下：,课后思考与讨论,1、四种时态的肯定句如何转化为否定句？2、四种时态的肯定句如何转化为一般疑问句？3、四种时态的肯定句如何转化为特殊疑问句？,
