do的6种形式（do的完整形式怎么写）

1、一般现在时 I do what I should do.

2、过去式 I did my homework yesterday.

3、现在进行时 what are you doing?

4、现在完成时 you have done the work.

5、被动时态 the work has been done by xiaohua.

6、助动词 who cut the tree? I did it.