过去式 did 一般是加ed 表示过去做过某事
e.g.I did my homework yesterday.
I read a book last week.
进行时doing 一般是加ing 表示正在做某事
e.g.Listen!The birds are sing.
I'm cooking.
将来时will do 一般在动词原形前加will 表示将来做某事
e.g.I will be back in 3 days
She will go to shanghai.
完成时have done 一般结构和过去式相同 表示做过某事并对现在产生影响
e.g.I have done my homework,so I can play soccer now.
I have lost my money,so I have to go home on foot.
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