七年级英语上册 第6单元语法 助动词do精讲课件 人教新目标版.ppt

苍南县求知中学 洪辉真 整理,助动词do初步讲解,一、什么是助动词,在英语中，助动词本身没有意义，只是帮助实义动词完成某些语法功能，如构成否定句、疑问句、简略答语等。助动词主要有be，do，have等。本单元我们主要探究do的基本用法。,二. 助动词do的基本用法,do有三种形式： 原形现在式第三人称单数过去式（这里只需对此有基本了解即可）,do的基本用法：,构成否定句构成一般疑问句及回答构成特殊疑问句,1. 原形,肯定式： do否定式： do not缩略否定式： dont,用法：do用在第一人称单复数、第二人称单复数和第三人 称复数做主语，且时态为一般现在时的句子中。,举例： I like that red dress. 否定句： I dont like that red dress（裙子）. 一般疑问句及回答: Do you like that red dress? Yes, I do./ No, I dont. 特殊疑问句: Which(哪一个) dress do you like?,2. 现在式第三人称单数,肯定式： does否定式： does not缩略否定式： doesnt,用法：does用在第三人称单数做主语，且时态为一 般现在时的句子中。注意：当does出现时，句子中用动词原形。,举例： She likes that red dress. 否定句： She doesnt like that red dress. 一般疑问句及回答: Does she like that red dress? Yes, she does./ No, she doesnt. 特殊疑问句: Which dress does she like?,3. 过去式（基本了解即可）,肯定式： did否定式： did not缩略否定式： didnt,用法：did用在时态为一般过去时的句子中, 用于 所有人称。注意：当did出现时，句子中用动词原形。,举例： They wanted to go to Beijing. 否定句： They didnt want to go to Beijing. 一般疑问句及回答: Did they want to go to Beijing? Yes, they did./ No, they didnt. 特殊疑问句: Where did they want to go?,1. What color ( ) you like best? A. do B. does C. are 2. What food ( ) she like best? A. do B. does C. is3. Dos she ( ) apples or pears? A. likes B. like C. liked4. Do you like red? ( ). A. Yes, I dont. B. Yes, I do. C. No, I do. D. No, I doesnt.ANSWERS: A B B B,EXERCISES,5. Do you have to go now? 肯定回答：( ) 否定回答：( )6. She has two brothers. 变为一般疑问句并做肯定回答： ( )7. They have a football. 对划线部分提问： ( ) ANSWERS: 5. Yes, I do. No, I dont. 6. Does she h