3．以辅音字母加y结尾，把y改成i再加 es fly — 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。哪些主语是第三人称单数：
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。 使用一般现在时的情况：
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。 第二，一般现在时陈述句的构成：
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。
第三，一般现在时的否定句、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 cleans
watch __________ have __________ cook_________ go __________ fly_________
make _________ drink ______ go _____ stay _____ make ___ look ____
have__________ pass_______ carry ____ come_______ watch_____ plant_______
fly ________ study_______ brush________ do_________ teach_______
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 his parents. 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. play B. plays C. are playing
( )2. Can I______ this book?
A. have B. has C. having
( )3. I to music at 7:00 this morning.
A. listen B. listening C. listens
( )4. What ______ that in the box? A shirt. A. am B. is C. are D. be ( )5. Can I TV? Sure.
A. watching B. watch C. see ( )6、She like swimming.
A. doesn't B. don't C. isn't. ( )7. Here the money.
A. are B. is C. am
( )8. There _______ a table and two chairs in Jenny’s room. A. am B. is C. are
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