小学英语四种时态语法讲解ppt课件.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？,
