一般现在时的自述三单变化：1.多数在动词后＋s play — plays like — likes2．以s ,x ,sh ,ch , o 结尾的＋es,go — goes wash — washes3．以辅音字母加y结尾，把y改成i 再加 esfly — flies cry — cries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：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"this / that / the+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"6" is a lucky number. "6"是个吉利数字。
②"I" is a letter. "I"是个字母。
Hello, boys and girls.我是一般现在时，你们想知道我的故事吗？Let me tell you!首先，介绍我的本领。
我的本领有三样：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。
第二，请看我的面目--构成：1. be动词：主语+be(am,is,are)+其它。
如：I am a boy.我是一个男孩。
2.行为动词：主语+行为动词(+其它)。
如：We study English.我们学习英语。
当主语为第三人称单数(he, she,it)时，要在动词后加"-s"或"-es"。
如：Mary likes Chinese.玛丽喜欢汉语。
第三，我的变化--否定句、一般疑问句、特殊疑问句：1. be动词的变化。
否定句：主语+ be + not +其它。
如：He is not a worker.他不是工人。
一般疑问句：Be +主语+其它。
如：-Are you a student?-Yes. I am. / No, I'm not.特殊疑问句：疑问词+一般疑问句。
如：Where is my bike?2.行为动词的变化。
否定句：主语+ don't( doesn't ) +动词原形(+其它)。
如：I don't like bread.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.一般疑问句：Do( Does ) +主语+动词原形+其它。
如：- Do you often play football?- Yes, I do. / No, I don't.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.一、写出下列动词的第三人称单数形式。
(讨论第三人称单数形式的变化规则)Model: clean cleans1) watch __________ 2) have __________3) cook_________ 4) go __________5) fly _________ 6) make _________二．用动词的正确形式填空。
1. We often___________(play) in the playgound.2. He _________(get) up at six o’clock.3. __________you _________(brush) your teeth every morning.4. What__________(do) he usually_________(do) after school?5. Danny__________(study)English,Chinese,Maths, Science and Art an school.6. Mike sometimes __________(go) to the park with his sister.7. At eight at night, she __________(watch) TV with hisparents.8. ________ Mike________(read) English every day?9.Tom (swim) in the river now.10.It’s eight o’clock now. The boys (watch) TV.11.She usually (do) her homework in the evening.12.Tom and Tony can’t (swim).13.What does your father ______ (do)? He’s a worker.14.Look! Jim and Tom (run) there.三．改句子1. Do you often play football after school? (肯定回答)2. I have many books. （改为否定句）3. Gao Shan’s sister likes playing table tennis （改为否定句）4. She lives in a small town near New York. （改为一般疑问句）5. I watch TV every day. （改为一般疑问句）6. David has got a goal. （改为一般疑问句）三、选择填空：( )1. Look! LiPing and Li Ying ________ basketball now.A. playB. playsC. are playing( )2. Can I______ this book?A. haveB. hasC. having( )3. I to music at 7:00 this morning.A. listenB. listeningC. listens( )4. What ______ that in the box? A shirt.A. amB. isC. areD. be( )5. Can I TV? Sure.A. watchingB. watchC. see( )6、She like swimming.A. doesn'tB. don'tC. isn't.( )7. Here the money.A. areB. isC. am( )8. There _______ a table and two chairs in Jenny’s room.A. amB. isC. are一般现在时（2）一．用动词的适当形式填空1. She _________(go) to school at seven o’clock.2. It’s 6 o’clock. They are _________ (eat) supper.3. He usually ___________ up at 17:00.(get )4. She ___________ (live) in Beijing.5. Amy _________ (be) here just now.6. _______ (be)there a fly on the table just now?7. My father __________ (watch) TV every evening .8. My father _______________ (make) toys these days.9．________ Amy _________ (read) English every day10. Chen Jie sometimes _________(go)to the park with her sister.二.选择填空1．I want____homework now.A. doingB. to doC. to do myD. do my2．It's time______.A. go to schoolB. play gamesC. to go homeD. to do my homeworks 3．____ you____the blackboard?Yes,I am.A. Can, cleanB. Am, cleaningC. Are, cleaningD. Doclean4．______go and help her.A. Let's meB. Let's usC. Let'sD. Let's to5．What are they doing? They are______things away.A. putB. putingC. puttingD. carry6．Do they have a new car? Yes,_____.D. they do A .they are B.they have C. they don't7．He often _________ supper at 6:00 in the evening.A. haveB. has c. is having D. is eating8. It’s 6 o’clock in the morning. He ___________.A. get upB. gets upC. is geting upD. is getting up9. What are you doing? I’m __________ TV.A. watchB. watchesC. to watchD. watching10. We _____________ any Chinese classes on Friday.A. are havingB. aren’t havingC. don’t haveD. are have11. Tom _______ an English class now.A. is havingB. hasC. havingD. have12. Are you playing basketball? No, we ___________.A. isn’tB. aren’tC. notD. don’t13. Listen! The girl _____________ in the room.A. singsB. singingC. is singingD. are singing14. The boy is __________ to his teacher.A. sayingB. speakingC. talkingD. telling三、用括号内动词的适当形式填空。