I do. I did. I shall do. I should do. I have done. I had done. I shall have done. I should have done. I am doing. I was doinf. I shall be doing. I should be doing. I have been doing. I had been doing.I shall have been doing. I should have been doing.
I have done. I had done. I shall have done. I should have done.
I am doing. I was doinf. I shall be doing. I should be doing.
I have been doing. I had been doing.I shall have been doing. I should have been doing.