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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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