1、助动词do初步讲解,一、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。,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 re
2、d 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.,Lily and I walk to school.莉莉和我步行去学校。否定句: Lily and I dont walk to school.莉莉和我没有步行去学校。一般疑问句及回答:Do Lily and you walk to school?Yes, we do. No, we dont.莉莉和你步行去学校
3、吗? 是的,我们步行去。不,我们不步行去。,练习,、我不喜欢狗。I dont like dogs. 、你有一本书吗?是的,我有。Do you have a book?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
4、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!,