tags:

  • English

  simple progressive perfect perfect pregressive
Present do/does am/is/are doing have/has done have/has been doing
Past did was/were doing had done had been doing
Future will do will be doing will have done will have been doing
Past-future would do would be doing would have done would have been doing

*ps:

do infinitive
does finite
did past tense
done past particle
doing ing form

<
Previous Post
关于世界图像的讨论
>
Next Post
考研英语作文(1)