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 。
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