did 用于过去时
done现在分词,用于现在完成时
I did my homework yesterday.过去的时间做了什么 强调动作本身
I have done my homework already,so I can play football in the afternoon.已经做完了作业,对现在的影响就是可以出去踢足球了.强调过去的某个动作对现在的影响