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，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，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 sweater?Yes, 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 English？Yes,he does. /No.he 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)— _______ , ________ _______.6.I like salad. (改为一般疑问句) _______ ______ ________ salad?7.Do you like bananas? (作肯定回答) _______ , ________ _________.8.Do they like milk? (作否定回答) ________, ______ _________.9.Does he like milk? (作否定回答) _______, _______ ________10.I like tomatoes. (把I改成 he重写句子)He _________ ___________.11.Linda 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 _________ .14.I 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)， .20.Tony has a baseball bat. (改为一般疑问句)_____ Tony _____a baseball bat?五：翻译（将中文翻译成英文）1．你喜欢香蕉吗？是的，我喜欢。

2．你妈妈喜欢苹果吗？是的，她喜欢。

3．他喜欢篮球吗？是的，他喜欢。

4．他们喜欢足球吗？是的，他们喜欢。

5．Jenny有裙子吗？是的，她有。

6．Tom有黑色长裤吗？不，他没有。

7．你爷爷有钢笔吗？不，他没有。

8．你爸爸和妈妈喜欢西红柿吗？是的，他们喜欢。

答案如下：一、选择适当的词填空（用do 和does/don’t doesn’t填空）21. Do you like soccer? Yes, I do .22. Do they like ping--pong? Yes, they do .23.Do Tony and Ben like baseball? No, they don’t .24. Do your friends like tennis? Yes, they do .25. Does your brother like basketball? No, he doesn’t .26. Do you like basketball? Yes, I do .27. Do they like salad? No, they don’t .28. Does Jenny have white sweaters? Yes, she does .29. Does Peter have black trousers? Yes, he does .30. Does your father like apples? Yes, he does .31. Do your friends like bananas? No, they don’t .32. Do your father and mother have milk for breakfast ?Yes, they do .33.I _____don’t__( don’t /doesn’t）play sports.34.You _____don’t____( don’t /doesn’t）like ice-cream.35..My parents__don’t______( don’t /doesn’t） want to watch TV.36.His friend __doesn’t_____( don’t /d oesn’t）eat breakfast.37.Mary __doesn’t_____( don’t /doesn’t）like salad.38.— Does he have a tennis ball? —Yes, he does .39.— Does Anna have a ping-pong bat? —Yes, shedoes .40.— Do Mike and Eric have some balls? —No, they don’t二.按要求完成句子。

1. Jenny has a ping-pong bat. (改为一般疑问句)__Does___ Jenny _have____a ping-pong bat?2. I like to eat vegetables every day. (改为一般疑问句)___Do___ you like to eat vegetables every day?3. They like bananas. (改为否定句)They __don’t____ ___like___ bananas.4. Tom likes apples.(改为一般疑问句)_Does_____ Tom __like____ apples?5. Does John like chicken?(否定回答)—__No_____ , ___he_____ ____doesn’t___.6.I like salad. (改为一般疑问句) _Do______ ___you___ __like____ salad?7.Do you like bananas? (作肯定回答) _Yes____ , _____I___ ____do_____.8.Do they like milk? (作否定回答) __No____, __they_____don’t________.9.Does he like milk? (作否定回答) ___No____, ____he____doesn’t_______10.I like tomatoes. (把I改成 he重写句子)He __likes_______ ____tomatoes_______.11.Linda and Alice like carrots. (改为一般疑问句并作肯定回答)___Do Linda and Alice like carrots______ ? ___________Yes, theydo______ .12.你喜欢西红柿吗? __Do_______ you like ______tomatoes_____?13.你弟弟喜欢鸡蛋吗？不，他不喜欢。