一般现在时中的第三人称单数形式
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。
什么是一般现在时？一般现在时的基本用法有哪些呢？
【一般现在时的功能】
1.表示事物或人物的特征、状态。如：The sky is blue.天空是蓝色的。 2.表示经常性或习惯性的动作。如：I get up at six every day.我每天六点起床。 3.表示客观现实。如：The earth goes around the sun.地球绕着太阳转。
标志词（时间状语）： always, every week (day, year, month…), once a week, every…, sometimes, at…, on Sunday uauslly often,never,hardly..........
一、人称代词he, she, it是第三人称单数。如： He likes watching TV. 他喜欢看电视。 She has lunch at twelve. 她十二点吃午餐。 It looks like a cat. 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： ①Han Mei looks like her mother. 韩梅看起来像她的母亲。 ②Beijing is in China. 北京在中国。
③Uncle Wang often makes cakes. 王叔叔经常做蛋糕。
三、单数可数名词或\单数可数名词\作主语时，是第三人称单数。如： ①A horse is a useful animal. 马是有用的动物。 ②This book is yours. 这本书是你的。 ③That car is red. 那辆小汽车是红色的。 ④The cat is Lucy'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： ①Everyone is here. 大家到齐了。
②There is something wrong with the watch. 这块手表有毛病。 ③This is a pen. 这是一支钢笔。 ④That is an eraser. 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： ①The milk is in the glass. 牛奶在玻璃杯里。 ②The bread is very small. 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： ①\是个吉利数字。 ②\是个字母。
动词第三人称单数+s或+es的规则：
1. 一般情况下在动词后直接+s。 2. 以ch, sh, s, x, o结尾的+es。
3. 以“辅音字母+y”结尾的把y 变i加es。 4. have的第三人称单数为has。
关于do和does的使用方法：
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\变为否定句, 要在动词前面加\可以简写为 \ 背：I do, you do, we do, they do, Jack and Tom do. He does, she does, it does, lily does.
（三）含有动词第三人称单数形式的句子变否定句和疑问时怎样变？
【注意：】只要句子中出现do, does,don’t,doesn’t, 句子中原来的实意动词要用原形
例如：He likes apples. (改成否定句) He doesn’t likes apples。(错) He doesn’t like apples。(对)
A 否定句：（1）当主语是第一，二或复数时，主语+ don't +动词原形(+其它)。如：
I don't like bread.
（2） 当主语为第三人称单数时，要用doesn't构成否定句。如： He doesn't often play.
B 一般疑问句：（1）当主语是第一，二或复数时，Do +主语+动词原形+其它。如：
Do you often play football?
- Yes, I do. / No, I don't.
(2) 当主语为第三人称单数时，要用does构成一般疑问句。如： - Does she go to work by bike? - Yes, she does. / No, she doesn't.
C特殊疑问句：疑问词+一般疑问句。如：
How does your father go to work?
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 apples? 4. [Do/Does]______ Tina go swimming on Sunday?
5. [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 zoo?
9. [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 word? 6. 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)