助动词do/does的用法专题
助动词do与does口诀
（一）(do ) 变句型，先观察，陈述句中动用原, 一般疑问do提前，否定don’t实动前。
（二）(does) 若是主语为三单，陈述句中动变形，一般疑问也简单， does放在句子前，否定doesn’t实动前，主动出现动还原。
总结：
含有实义动词的句子，进行句子转换时应借助于助动词do/does，主语是三单(he,she,it)时用does，其他用do。否定句在动词原形前加don’t /doesn’t，一般疑问句把do/does 提前,特殊疑问句由特殊疑问词+一般疑问句。
句子类型及结构
肯定句：主语+动词+其它。主语是三单，动词用三单
I like this blue sweater. Tom likes this blue sweater.
我喜欢这件蓝色的毛衣。Tom喜欢这件蓝色的毛衣。
Tom likes English.
Tom喜欢英语。
I like this blue sweater.
Tom likes English.
否定句：主+ don’t/doesn’t+动原+其它
I don’t like this blue sweater.
我不喜欢这件蓝色的毛衣。
Tom doesn’t like English.
Tom不喜欢英语。
I like this blue sweater.
Tom likes English.
一般疑问句：do/does提前，其它照抄不变（Do /Does+主+动原+其它），一人称变二人称。回答：Yes,主+do/does. No,主+ don’t/doesn’t.
Do you like this blue sweaterYes, I do. / No, I don’t.
你喜欢这件蓝色的毛衣吗是的，我喜欢; 不，我不喜欢。
Does Tom like EnglishYes,he does. / doesn’t.
Tom喜欢英语吗是的，他喜欢；不，他不喜欢。
练一练：
一、选择适当的词填空（用do 和does/don’t doesn’t填空）
1.you like soccer Yes, I .
2.they like ping--pong Yes, they .
3.Tony and Ben like baseball No, they .
4.your friends like tennis Yes, they .
5.your brother like basketball No, he .
6.you like basketball Yes, I .
7.they like salad No, they .
8.Jenny have white sweaters Yes, she .
9.Peter have black trousers Yes, he .
10.your father like apples Yes, he .
11.your friends like bananas No, they .
12.your father and mother have milk for breakfast
Yes, they .
13.I ________( don’t /doesn’t）play sports.
14.You _________( don’t /doesn’t）like ice-cream.
15..My parents________( don’t /doesn’t）want to watch TV.
16.His friend _______( don’t /doesn’t）eat breakfast.
17.Mary _______( don’t /doesn’t）like salad.
18.—he have a tennis ball —Yes, he .
19.—Anna have a ping-pong bat —Yes, she .
20.—Mike and Eric have some balls —No, they
二.按要求完成句子。
1. Jenny has a ping-pong bat. (改为一般疑问句)
_____ Jenny _____a ping-pong bat
2. I like to eat vegetables every day. (改为一般疑问句)
______ you like to eat vegetables every day
3. They like bananas. (改为否定句)
They ______ ______ bananas.
4. Tom likes apples.(改为一般疑问句)
______ Tom ______ apples
5. Does John like chicken(否定回答)
— _______ , ________ _______.
like salad. (改为一般疑问句) _______ ______ ________ salad you like bananas (作肯定回答) _______ , ________ _________.
they like milk (作否定回答) ________, ______ _________.
he like milk (作否定回答) _______, _______ ________
like tomatoes. (把I改成he重写句子)
He _________ ___________.
and Alice like carrots. (改为一般疑问句并作肯定回答)
_______________________________ _________________ .
12.你喜欢西红柿吗_________ you like ___________
13.你弟弟喜欢鸡蛋吗不，他不喜欢。
_______ your brother _______ _______ No, he _________ .
have three English books. (改为否定句)
I three English books.
15. I have a new volleyball. (改为一般疑问句)
a new volleyball
16. Does Li Lei have a tennis ball ( 作否定回答)
，.
17.I have a computer. (改为否定句)
I a computer.
18. She has a ping-pong ball. (改为一般疑问句)
she a ping-pong ball
19. Does Helen have a dictionary (作肯定回答)
