Present Simple- I do exercises every day.
Present Progressive- I am doing exercises now.
Present Perfect- I have already done my exercises.
Present Perfect Progressive- I have been doing my exercises since morning.
прошедшее:
Past Simple-I did exercises yesterday.
Past Progressive- I was doing exercises at 5 o'clock yesterday.
Past Perfect-I had done my exercises before you came home.
Past perfect Progressive-I had been doing my exercises for an hour when you came home.