do和does的用法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 dont like bananas.Do you like apples?Does he like English?He doesnt 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 doesnt do his homework in the evening.这里加上了助动词doesnt，而原来的主动词does变成原形do了。作为助动词的do和does是没有词义的，它们在句中的构成一般现在时的疑问句和否定句.Do用于主语第一人称，
