Question

英语do和does的用法与区分

Answer 1

1、do和does可以用作实义动词，在一般现在时肯定句中，其中does用在第三人称单数，do用在其它人称中，如： He does his homework everyday. I do excercise every Fridday. 2、do和does可以用作助动词，完成一般现在时的问句及回答和否定句中，其中does用在第三人称单数，do用在其它人称中，如： Do you love me?/No, I don't. Does he go to school everyday?/Yes, he does. What do you do on Satudays?(第一个do) What does he do every morning? I don't like snakes. He doesn't want to study English. 3、do可以作为实义动词，代替所提问的动作，用在特殊疑问句的各时态中，如： How do you do?（第二个do） What did you do last night? 个人所学归纳，仅供参考。

Answer 2

作为行为动词，前者主语是非单三，后者主语是单三。如 we do our homework.he does his homework.
作为助动词，后面须跟动词原形共同构成谓语，二者用于非be 动词的一般现在时的否定句和疑问句中。前者主语是非单三，后者主语是单三。如Do you work hard？We don't work hard。Does he work hard?He doesn‘t work hard.