第 3 页精品文档---下载后可任意编辑新初三必看英语语法之 Do 的作用动词 do 在句中的作用可以概述为四句十二字：做实义，助动词，替前文，强语气。 作用一：实义 do do 作实义动词时，有 do, does, did, done, doing 五种形式，还有及物、不及物之分。如： 1. vt. 做；争辩；整理；完成。如： ①The old man does an hour of sport every day. ②She did her homework at home last night. ③Mother was doing the cooking when I reached home. ④Have you done the exercises yet? 2. vi. 行动；工作；进展；足够。如： ①Kate does very well in her Chinese. ②How do you do? ③Well done! ④That will do. 作用二：助动 do do 作助动词时，只有 do, does, did 三种形式，无词义，限用于含行为动词的一般如今时和一般过去时两种时态的否认句和疑问句中。如： ①They dont have any tickets for tonights concert. ②Kate stayed at home last night, didnt she? ③How many books does the library have? ④She doesnt do the washing in the evening. 作用三：替代 do 为避开动词的重复，使语言简练，常以 do, does, did 替代前文所用的行为动词。如： ①Tom runs much faster than you do. ②-Lucy, can you get some more tea, please? -Sure. Ill do it right away. ②-Who broke the cup? -Mimi did. ③-I like bananas. -So does he. 作用四：语气 do 为突出感情颜色，do 常用于祈使句、强调句和倒装句中，以加强语气。如： ①Do be careful. ②Dont tell a lie. ③He did come. ④-You often go to the park. -So we do.
