助动词DO的讲解

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 r

2、ed 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

3、 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

4、答: did they like 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. 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 h