现在进行时
He is doing his homework.
He is not doing his homework.
Is he doing his homework?
一般时
He does his homework.
He doesn't do his homework.
Does he do his homework?
将来时
He will do his homework.
He won't do his homework.
Will he do his homework?
过去时
He did his homework.
He didn't do his homework.
Did he do his homework?