1、,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
2、 dress.否定句：I dont like that red dress.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 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
3、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 like want to
4、 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. is 3. Dos she ( ) apples or pears?A. likes B. like C. liked 4. 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 have two brothers? Yes, she does.7. What do they have?,THANK YOU !,GoodBye!,
