小学英语动词的单三形式讲解第五次讲义范文.doc

四年级英语下册第五次讲义
一 小学英语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：
  ① Han Mei looks like her mother. 韩梅看起来像她的母亲。
   ② Beijing is in China. 北京在中国。
   ③ Uncle 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：
  ① A horse is a useful animal. 马是有用的动物。
   ② This book is yours. 这本书是你的。
   ③ That car is red. 那辆小汽车是红色的。
   ④ The 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：
   ① Everyone is here. 大家到齐了。
   ② There is something wrong with the watch. 这块手表有毛病。
   ③ This is a pen. 这是一支钢笔。
   ④ 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：
   ① The milk is in the glass. 牛奶在玻璃杯里。
   ② 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：
   ①"6" is a lucky number. "6"是个吉利数字。
   ②"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-makes
2.以s,x,ch ,sh等结尾的单词加 es , 如： miss-misses fix-fixes
finish-finishes teach-teaches
3.以辅音字母加y结尾的单词，变y为i加 es , 如： fly-flies
4.以辅音字母加o结尾的单词，加 es 如: go-goes do-does
动词单三的练习三 写出下列动词的第三人称单数。
go do
play jump
swim run
put sing
dance come
get have
fly study
read 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 teacher _____(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) 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，并做回答。
1. I like playing the pinao in the music room . (Tom)

2. You need a pencil-box for new term . (Sam’s sister)
.
3.I do my homework at half past four in the afternoon . （she）
.

4. I have breakfast at twenty-five past seven in the 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——一步法
1、 在be动词后加not。如：is not ， are not ， am not， was not， were not；
2、 在can，should， will等后加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’t。
4、 some 改成any。
二、 肯定句改一般疑问句的方法——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：陈述句: They are in the park. He can play the guitar..
一般疑问句: Are they in the park? Can he play the guitar?
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.
一般疑问句：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 like making the puppet.
_________________________________
3. Su Hai and Su Yang live in a new house.
_________________________________________________
4.I put a book on my head.
_________________________________________________
5. They sing “In the classroom”together.
_________________________________________________
6.We play basketball on Sundays.

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