小学英语语法：“第三人称单数”第三人称有“他、她、它以及一些单数名词”。
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。
一、动词第三人称单数的变化规则及发音规律动词原形变第三人称单数的规则与发音规律同名词单数变复数大致相同，请认真观察。
1、大多数动词在词尾加“S”如：stop－stops [s] ; make－makes [s] read－reads [z] ; play－plays [z]2、以辅音字母加“y”结尾的，要先将“y”变为“i”，然后在加“es”读[iz] 如：fly－flies [z]； carry－carries [z] study－studies [z]; worry －worries3、以“s, x, ch, sh”结尾的，在词尾加“es”，发音为[iz] 如：teach－teaches [iz]; watch－watches [iz]4、以“o”结尾的动词，加“es”，如：go－goes [z] do－does [z]注：下面几个动词变为单数时，原词的元音部分的发音发生了较大的变化，请注意记忆。
如：do [du:]－does [dz] say [sei]－says [sez]以不发音字母“e”结尾的开音节词，如果尾音是[s]，[z]时，加“s”后字母“e”发音，与所加“s”一起读做[iz]。
如：close－closes [iz]一、第三人称代词 he, she, it 做主语时。
例如：She is very good at English. 她英语学得好。
He studies in a middle school. 他在一所中学学习。
He likes watching TV. 他喜欢看电视。
She has lunch at twelve. 她十二点吃午餐。
He can play football. 他会踢足球。
He usually gets up at 6:oo. 他通常6点起床。
It looks like a cat. 它看起来像只猫。
二、单独使用的人名、地名或称呼语做主语时。
例如:Jim often plays football with his friends.吉姆经常和他的朋友们踢足球。
Does Uncle Wang like making things 王叔叔喜欢做东西吗Han Mei looks like her mother. 韩梅看起来像她的母亲。
Beijing is in China. 北京在中国。
Uncle Wang often makes cakes. 王叔叔经常做蛋糕。
三、不可数名词做主语时。
例如：Is there any juice in the bottle 瓶里有果汁吗The milk is in the glass. 牛奶在玻璃杯里。
The bread is very small. 那面包很小。
四、单数可数名词做主语时。
例如：The box is in your room. 箱子在你的房间里。
What is that girl doing over there 那女孩在那边干什么A horse is a useful animal. 马是有用的动物。
That car is red. 那辆小汽车是红色的。
The cat is Lucy's. 这只猫是露茜的。
五、单个数字、算式或单个字母做主语时。
例如：Three plus nine is twelve. 三加九等于十二。
"I" is an English letter. "I" 是个英语字母。
"6" is a lucky number. "6"是个吉利数字。
六、指示代词this, that等做主语时。
例如：This is her red pen. 这是她的红钢笔。
That is an eraser. 那是一块橡皮擦。
七、代词one做主语时。
例如：One of them is watching TV. 他们中的一个人正在看电视。
八、不定代词something, anything, nothing, someone, somebody, nobody, everything等做主语时。
例如：There's something wrong with the computer. 这台电脑坏了。
Everyone is here. 大家到齐了。
九、请看下面两组句子，注意区分他们的共同点和不同点。
I go to school every day. I don't go to school every day.He goes to school every day. He doesn't go to school every day.Do you go to school every day Yes, I do. (No, I don't)Yes, he does. (No, he doesn't) Does he go to school every day 注：1）第三人称单数用了 does 后面就不用动词的s形式了,而用动词原形.2）变为疑问句,要在句首加"do" does ; 变为否定句, 要在动词前面加"do not ,does not", 可以简写为 "don't", doesn’t.2012小学第三人称单数练习题一．Do还是Does我来选。
1. [Do/Does]______ he watch TV at night Yes he does.2. [Do/Does]______ you go to school everyday No, I don’t.3. [Do/Does]______ Jack and Peter like apples4. [Do/Does]______ Tina go swimming on Sunday5. [Do/Does]______they play football Yes, they ___[do/does].6. [Do/Does]______ we have a good teacher Yes, we ____[do/does].7. [Do/Does]_____ they jump rope No, they ___[do not/does not].8. [Do/Does]_____your dog walk in the zoo9. [Do/Does]____ I have a big nose No, you _____[do not/does not].10. [Do/Does]____ your cats eat fish Yes, they _____.[do/does].11. [Do/Does]_____ their mothers go shopping No, they ____[do not/does not].12. I ___[do not/ does not] speak Japanese. [Do/Does] _____you speak Japanese二．请用 have或has填空。
1．I ________ a nice picture.2．He ________ a good friend.3．They _________ some kites.4．We ________ some flowers.5．She __________ a duck.6．My father __________ a new bike.7．Her mother _________ a vase.8．Our teacher _________ an English book.9．Our teachers _________ a basketball.10．Their parents __________ some story books.11．Nancy _______ many skirts.12．David ________ some jackets.13．My friends ________ a football.14．What do you ________15．What does Mike ________三．请用动词的适当形式填空。
1. Let him _____(play)basketball.2. Everyone_____(know)what he really like.3. Those girls____(be)my sister.4. That girl_____(call)me every Sunday.5. How___(do)she_____(spell)the word6. He________ TV every evening. (watch)7. We always ________ to school on foot. (go)8. Tom, with his classmates, often ______ football after school. (play)9. Your shoes _______ under the bed. (be)10. ______ here and ______ by me. (come, stand)11. His uncle usually _________ to work by bus. (go)12. I always ______ up at six in the morning. (get)13. John ________ like his father. (look)四．否定句:在动词前+doesn't或don't.1. She_____ _____ (do) her homework every day.2. He_____ _____ (live) in ShangHai.3. He_____ _____ (need) a pair pf shoes.4. Danny_____ _____ (see) the apple tree5. She_____ _____ (come) from America.6. The girl_____ _____ (look) out of the window and sees many birds in the sky.五．请用动词的适当形式填空。