动词的单三形式,

1、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:?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：? Han Mei looks like her mother.杀。? ? Beijing is in C

2、hina.? ?(3) Uncle Wang often makes cakes. 三、单数可数名词或"this / that / the+ 是第三人称单数。如：? A horse is a useful animal.韩梅看起来像她的母北京在中国。王叔叔经常做蛋糕。单数可数名词"作主语时,马是有用的动物。? This book is yours.这本书是你的。? ?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。?四、不定代词 someone, somebody, nobody, everything,

3、something 等及指示代词this, that作主语时，是第三人称单数。如：? Everyone is here.大家到齐了。? ? There is something wrong with the watch.这块手表有毛病。? ?This is a pen. 这是一支钢笔。? That 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：? ?The milk is in the glass.牛奶在玻璃杯里。? The 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：? ?"6"

4、 is a lucky number. "6"是个吉利数字。? ?"I" is a letter. "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-works live-lives make-makes2 .以 s,x,ch ,sh 等结尾 的单词 力口 es , 如： miss-misses fix-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。结尾的单词，力口 es 如：go-g

5、oes do-does 动词单三的练习三写出下列动词的第三人称单数。go doplay jump swim run put singdance come get have fly studyread write look drink eat walk 一.根据括号里单词的适当形式填空1. She(be ) a writer.2. It(look) like a monkey.3. We(go) to the park.4. He(go) to school.5. Amy(like) eating fruits.6. Hebei(be) next to Shandong.7. Our teach

6、er(be) talking with John.8. Whose book(be) this ?9. Dogs(be) our friends .10. That blackboard(be) clean.11. The desk(be) Tom ' s.12. Somebody(do) her homework .13. Everybody(is ) ok!14. Nobody(be) in the park .15. There (be) someone in the classroom .16. That cat(be ) mine .17. A little water(be

7、) in the cup.18. Cheese (taste ) well .19. The letter"O' (look) like zero.20. “4” (be) a bad number in China .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，弁做回答。1. I like playing the pinao in the music room. (Tom)2. You need a pencil-box for new term . (Sam' ssister)3.I do my homework at half past fou

8、r in the afternoon .(she)4. I have breakfastattwenty-five pastseven inthe morning . (her father )5. I watch TV at quarter past six with my parents . (Tom' s sister)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一一一步法1、 在 be 动词后力口 not。如：is not , ar

9、e not , am not, was not, were not ;2、 在 can, should , will 等后力口 not。如：cannot, should not, will not ;3、上述都没有的，在动词前加助动词否定形式don't/doesn 't/didn 'to4、some 改成 any。二、肯定句改一般疑问句的方法一一三步法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

10、：陈述句: They are in the park. He can play theguitar.一般疑问句: Are they in the park? Can he play theguitar?把下列句子变成一般疑问句1. I am listening to music.2. Mike is a student.3. Sarah can clean the classroom.4. They are in the zoo.5. There are some flowers in the vase.6. This is my sister.7. We are sweeping the floor.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: I like the ducks. He likes the dogs.Do you like the ducks? Does he like the dogs?把下列句子改为一般疑问句。1. We need some masks.2. They