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:
Weusuallydoourhomeworkintheafternoon.
Hedoeshishomeworkintheevening.
2.作为助动词,也就是帮助主要动词构成否定和疑问等.
Wedon'tlikebananas.
Doyoulikeapples?
DoeshelikeEnglish?
Hedoesn'tlikeswimming.
上面有一句Hedoeshishomeworkintheevening.要是变成否定句就成了这个样子:
Hedoesn'tdohishomeworkintheevening.
这里加上了助动词doesn't,而原来的主动词does变成原形do了.