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.