Помогите пожалуйста, нечего непонял по теме Раскройтескобки, употребляяглаголыв…

1. I have not eaten today yet. 2. He did not eat yesterday. 3. Did you played the piano yesterday? 4. Do you play the piano today? 5. What do you prepare for today? 6. Look at this birdhouse. Mike made it himself. He made it last Sunday. 7. Where did you put my pen? I can not find it. 8. Do you see Mary today? 9. When did you saw Mary? — I saw her last week. 10. Does your mother promise to take you to the theatre? 11. Look at my new dress! I made it myself. Вот, пока что, что решила