助动词do的用法.ppt
2010级英语师范三班 梁静一、助动词一、助动词(auxiliary verb)auxiliary verb)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。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1.1.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(I,we)、第二人称单复数(you)和第三人称复数(they)做主语,且时态为一般现在时的句子中,构成否定句、一般疑问句及回答、特殊疑问句。Examples:I like this red hat.我喜欢这顶红色的帽子。否定句:我不喜欢这顶红色的帽子。I dont like this red hat.一般疑问句及回答:你喜欢这顶红色的帽子吗?是的,我喜欢。不,我不喜欢。Do you like this red hat?Yes,I do./No,I dont.特殊疑问句:你喜欢哪一顶帽子?Which hat do you like?Lily and I want to go to Beijing.莉莉和我想去北京。否定句:Lily and I dont want to go to Beijing.莉莉和我不想去北京。一般疑问句及回答:Do Lily and you want to go to Beijing?Yes,we do.No,we dont.莉莉和你想去北京吗?是的,我们想去。不,我们不想去。特殊疑问句:Where doLily and you want to go?莉莉和你想去哪儿?练习、我不喜欢狗。dont like dogs.、你喜欢什么颜色?What color do you like?、你有词典吗?是的,我有。Do you have a dictionary?Yes,I do.2.2.现在式第三人称单数现在式第三人称单数用法: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。肯定式:does否定式:does not缩略否定式:doesntExamples: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?3.3.过去式过去式肯定式: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。ExamplesExamples: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?