助动词DO的讲解.pptx

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1、一、什么是助动词一、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。第1页/共14页二二.助动词助动词dodo的基本用法的基本用法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）第2页/共14页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第3页/共14页1.1.原形原形肯定式：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。第4页/

2、共14页举例：I like that red 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?第5页/共14页2.2.现在式第三人称单数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。第6页/共14页举例：She likes that red dress.否

3、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?第7页/共14页3.3.过去式过去式（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。第8页/共14页举例：They wanted to go to Beijing.否定句：They didnt want to g

4、o to Beijing.一般疑问句及回答: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?第9页/共14页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.

5、Yes,I do.C.No,I do.D.No,I doesnt.ANSWERS:A B B B EXERCISES第10页/共14页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?第11页/共14页第12页/共14页第13页/共14页谢谢您的观看！第14页/共14页