do does 这两个助动词用的规则

do 这个词（does是第三人称单数形式）,大体上从两方面来讲.
1.作为行为动词,跟其他动词一样,如study, play等.他的意思是“做”等.如：
We usually do our homework in the afternoon.
He does his homework in the evening.

2.作为助动词,也就是帮助主要动词构成否定和疑问等.
We don't like bananas.
Do you like apples?
Does he like English?
He doesn't like swimming.

上面有一句He does his homework in the evening.要是变成否定句就成了这个样子：
He doesn't do his homework in the evening.
这里加上了助动词doesn't,而原来的主动词does变成原形do了.

都用在一般现在时，谓语不是be动词的情况，do的主语是出单数第三人称意外的其他人称，does用于主语是第三人称的情况