科普英语小学五年级上lesson.pptx
第1页/共19页screen/skrin/第2页/共19页Lets learnA computer has a screen.肯定句Does a computer have a screen?一般疑问句Yes,it does.肯定答语A computer has a mouse.Does a computer have a mouse?Yes,it does.A computer has a keyboard.Does a computer have a keyboard？Yes,it does.第3页/共19页A TV has a screen.Does a TV have a screen?Yes,it does.A TV doest have a mouse.Does a TV have a mouse?No,it doesnt.A TV doest have a keyboard.Does a TV have a keyboard?No,it doesnt.否定句一般疑问句否定回答第4页/共19页 课 文Oh！You have a nice TV.No,its not a TV.Its a computer.But it looks like a TV.Yes.But a computer has a keyboard.哦！你有一台不错的电视。不,它不是电视。它是一台电脑。但是它看起来像电视。是的。但是电脑有一个键盘。第5页/共19页Whats that?Its a mouse.Does a TV have a mouse,too?No,it doesnt.Where is the mouse?Let me catch it.Look!Here it is.那是什么？是鼠标。电视机也有一个鼠标吗？不,它没有。老鼠在哪?让我来抓它。看!它在这。第6页/共19页look like 看起来像A look(s)like B.A看起来像B。鼠标看起来像一只老鼠。A mouse looks like a mouse.电脑看起来像一台电视。A computer looks like a TV.第7页/共19页动词单三1.什么是动词单三形式?2.哪些词才有单三形式?3.什么时候用单三形式?答:1.就是当一般是句子开头的人/物是第三人称、单数(两个条件必须同时满足)时，动词(表示动作的词)必须要用第三人称单数形式,即常在动词后加-s或-es.2.be(am,is,are)动词和表示动作的词即动词,如:run跑,have吃、喝、有,like喜欢,第8页/共19页meet遇见,swim游泳都是动词。只有动词才有单三形式。3.判断动词用不用单三形式,我们主要看句子开头的人/物。当人/物不是我I,你you,复数,都可以看成是第三人称单数。这时be动词只能用is,动词要变成单三形式。判断对人称最关键。第9页/共19页动词单三变化规则1.一般在动词之后直接加s,在清辅音后发音为s,在浊辅音及元音后发音为 z 例如:stopstops s;makemakes s readreads z;playplays z 2.以sh/ch/s/x结尾的词+es,发音为iz例如:teachteaches iz;watchwatches iz 3.以辅音字母+y结尾的,把y变成i,+es,读作iz 第10页/共19页例如:studystudies buy-buys4.辅音字母+o结尾的+es,读作z 例如:gogoes z dodoes z 下面几个动词变成单三形式时,原词的元音部分的发音发生了较大的变化,请注意发音。如:1、do du:做does dz 2、say sei 说,讲says sez 3、have hvhas hz第11页/共19页第12页/共19页肯定回答:Yes,第三人称单数 does.否定回答:No,第三人称单数 doesnt.例如:Does she have a sister?肯定回答:Yes,she does.否定回答:No,she doesnt.第13页/共19页背变疑问句步骤:1.首先看句子中有没有be动词(am,is,are)若有,变否定直接在be动词后加not,变疑问直接把be动词提前(第一人称的词都要变为第二人称的词I变you,we变you,my变your,our变your)。2.若句子中没有be动词,看句子中有没有can,若有,变否定直接在can后加not,变疑问直接把can提前。3.若句子中既没有be动词也没有can,找实意动词。变一般疑问句分两种情况,是单三人称的,变疑问在句子开头加Does,并把动词单三变原形(前面打死does后面去死s),不是单三人称的，变疑问，直接在句子开头加Do 就行了。第14页/共19页练习变疑问句1.He likes dogs.2.I love my cat.3.We have a ruler.4.He has an egg.5.They have five cats.6.Qiqi has a football.7.She has two pencils.8.I am a teacher.Does he like dogs?Do you like your cat?Do you have a ruler?Does he have an egg?Do they have five cats?Does Qiqi have a football?Does she have two pencils?Are you a teacher?第15页/共19页练习变否定句1.His name is Tom.His name is not Tom.2.We like football.We dont like football.3.You have a computer.You dont have a computer.4.They have a keyboard.They dont have a keyboard.5.My parents have a car.My parents dont have a car.第16页/共19页作 业1.动词单三变化规则要求会背,例子要求会默写。2.小小翻译家。你有两只眼睛吗？是的,我有。Do you have two eyes?Yes,I do.他有四条腿吗？不,他没有。Does he have four legs?No,he doesnt.你们有牛奶吗？不,我们没有。Do you have milk?No,we dont.第17页/共19页第18页/共19页感谢您的观看！第19页/共19页
