助动词do的用法.ppt

2010级英语师范三班 梁静,助动词do初步讲解,一、助动词（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.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(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.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：doesnt,Examples: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,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。,Examples：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?,Thank you!,