动词的单三形式,

动词的单三形式讲解大家都知道，在一般现在时中，当主语是第三人称单数时，谓语动词要用第三人称单数形式，即常在动词原形后加-s或-es。但有些同学们对于哪些主语是第三人称单数还不十分清楚，现归纳总结如下：一、人称代词he,she,it是第三人称单数。如：HelikeswatchingTV.他喜欢看电视。Shehaslunchattwelve.她十二点吃午餐。Itlookslikeacat.它看起来像只猫。二、单个人名、地名或称呼作主语；是第三人称单数。如：①HanMeilookslikehermother.韩梅看起来像她的母亲。②BeijingisinChina.北京在中国。③UncleWangoftenmakescakes.王叔叔经常做蛋糕。三、单数可数名词或this/that/the+单数可数名词作主语时，是第三人称单数。如：①Ahorseisausefulanimal.马是有用的动物。②Thisbookisyours.这本书是你的。③Thatcarisred.那辆小汽车是红色的。④ThecatisLucy's.这只猫是露茜的。四、不定代词someone,somebody,nobody,everything,something等及指示代词this,that作主语时，是第三人称单数。如：①Everyoneishere.大家到齐了。②Thereissomethingwrongwiththewatch.这块手表有毛病。③Thisisapen.这是一支钢笔。④Thatisaneraser.那是一块橡皮擦。五、不可数名词作主语时为第三人称单数。如：①Themilkisintheglass.牛奶在玻璃杯里。②Thebreadisverysmall.那面包很小。六、当数字或字母作主语时，看作第三人称单数。如：①6isaluckynumber.6是个吉利数字。②Iisaletter.I是个字母。第三人称单数形式的构成1.一般直接在词尾加s，如：work-workslive-livesmake-makes2.以s,x,ch,sh等结尾的单词加es,如：miss-missesfix-fixesfinish-finishesteach-teaches3.以辅音字母加y结尾的单词，变y为i加es,如：fly-flies4.以辅音字母加o结尾的单词，加es如:go-goesdo-does动词单三的练习三写出下列动词的第三人称单数。godoplayjumpswimrunputsingdancecomegethaveflystudyreadwritelookdrinkeatwalk一.根据括号里单词的适当形式填空1.She_____(be)awriter.2.It_____(look)likeamonkey.3.We_____(go)tothepark.4.He_____(go)toschool.5.Amy_____(like)eatingfruits.6.Hebei_____(be)nexttoShandong.7.Ourteacher_____(be)talkingwithJohn.8.Whosebook_____(be)this?9.Dogs_____(be)ourfriends.10.Thatblackboard_____(be)clean.11.Thedesk_____(be)Tom’s.12.Somebody_____(do)herhomework.13.Everybody_____(is)ok!14.Nobody_____(be)inthepark.15.There_____（be）someoneintheclassroom.16.Thatcat_____(be)mine.17.Alittlewater_____(be)inthecup.18.Cheese_____（taste）well.19.Theletter“O”_____(look)likezero.20.“4”_____(be)abadnumberinChina.二.把下列句子改成第三人称单数句的肯定句、否定句、一般疑问句，并做回答。1.Ilikeplayingthepinaointhemusicroom.(Tom)2.Youneedapencil-boxfornewterm.(Sam’ssister).3.Idomyhomeworkathalfpastfourintheafternoon.（she）.4.Ihavebreakfastattwenty-fivepastseveninthemorning.(herfather).5.IwatchTVatquarterpastsixwithmyparents.(Tom’ssister).二小学英语所有句型转换的方法基本助动词只有三个：be,do,have,他们没有词汇意义，只有语法作用，如协助构成进行体，完成体，被动态，否定句，疑问句等。一、肯定句改否定句的方法——一步法1、在be动词后加not。如：isnot，arenot，amnot，wasnot，werenot；2、在can，should，will等后加not。如：cannot，shouldnot，willnot；3、上述都没有的，在动词前加助动词否定形式don’t/doesn’t/didn’t。4、some改成any。二、肯定句改一般疑问句的方法——三步法1、把be动词放在句首，剩下的照抄，（some改成any，my改成your等）句点改成问号。2、把can，shall，will等放到句首，剩下的照抄，（some改成any，my改成your等）句点改成问号。例如：陈述句:Theyareinthepark.Hecanplaytheguitar..一般疑问句:Aretheyinthepark?Canheplaytheguitar?把下列句子变成一般疑问句1.Iamlisteningtomusic._______________________________________2.Mikeisastudent._______________________________________3.Sarahcancleantheclassroom.________________________________________4.Theyareinthezoo.________________________________________5.Therearesomeflowersinthevase.________________________________________6.Thisismysister._________________________________________7.Wearesweepingthefloor.__________________________________________3、上述都没有的，在句首请助动词Do/Does/Did帮忙，剩下的照抄，（some改成any，my改成your等）句点改成问号。例如：陈述句:Iliketheducks.Helikesthedogs.一般疑问句：Doyouliketheducks?Doeshelikethedogs?把下列句子改为一般疑问句。1.Weneedsomemasks._________________________________2.Theylikemakingthepuppet._________________________________3.SuHaiandSuYangliveinanewhouse._________________________________________________4.Iputabookonmyhead._________________________________________________5.Theysing“Intheclassroom”together._________________________________________________6.WeplaybasketballonSundays.