Do和Does的用法作为助动词的do和does是没有词义的，它们在句中的构成一般现在 时的疑问句和否定句。三单用does,复数用do 询问动物是否喜欢什么句型：Do snakes like music? 【复数，用 do 提问，they 答】肯定回答：Yes, they do.否定回答：No, they don t.Does snake like music?【单数，用 does 提问，it答】肯定回答：Yes, it do.否定回答：No, it don t.询问别人是否经常干某事句型：Do you often？你经常干什么吗？回答：Yes, I do/ No, I don t.例：Do you often play games?你经常玩游戏吗？Yes, I do/ No, I don t.询问别人是否想要干某事句型：Do you want to +动词原形？你想干什么吗？肯定回答：Yes, I(we) do/ Yes, please.否定回答：No, I (we) don t/ No, thank you你想喝一杯咖啡吗？例： Do you want to drink a coffee?Yes, I(we) do/ Yes, please.No, I (we) don t/ No, thank you练习题：1.What_you need for breakfast? Some milk and an egg.1.1 _want any juice.I want some milk.3 .Do Ben and you like vegetables? No,we_.4 .How_they go to school?By underground.5 ._your friend have lessons every day?No,he_.6 .What_your father do? Hes a shop assistant.7 .Tom,_make a noise in class,please.8 .Kitty_do her homework at school.She_it at home.三将下列句子改为否定句和一般疑问句1.I do my homework at home.否定句：一般疑问句：2 .We have a picnic on Sundays.否定句：一般疑问句：3 .Ben rides his bicycle at four oclock.否定句：一般疑问句：4 .Kitty goes to bed at half past nine.否定句：一般疑问句：5 .Janes father gets up at quarter past six every morning.否定句：一般疑问句：