一、核心区别：主语搭配
二、do的主要用法
1. 构成一般现在时的疑问句和否定句 - 疑问句：Do you speak French? / Do they live here? - 否定句：I do not (don't) like spicy food. / We do not have enough time.2. 用于谓语动词 - I do love this song! / You do look tired today.
3. 替代前文出现的动词，避免重复 - A: Do you play basketball? B: Yes, I do.
三、does的主要用法
1. 构成第三人称单数的疑问句和否定句 - 疑问句：Does he work in a hospital? / Does the train arrive on time? - 否定句：She does not (doesn't) watch TV in the morning. / It does not rain often here.2. 用于第三人称单数的谓语动词 - He does know the answer. / This movie does deserve an award.
3. 替代第三人称单数的动词 - A: Does she study English? B: Yes, she does.
四、特殊意事项
通过主语人称和数的匹配，do和does的用法可简单归纳为：复数主语与一、二人称用do，第三人称单数用does，二者在疑问句、否定句和句中发挥关键作用。