关于初中英语语法：Do 的二作用
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；研究；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.一般现在时和一般过去时两种时态的否定句和疑问句中。如：
①They don't have any tickets for tonight's concert.
②Kate stayed at home last night, didn't she?
③How many books does the library have?
④She doesn't do the washing in the evening.
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