1. I haven't (have not) yet eaten today. (Present Perfect) 2. He didn't ( did not) eat yesterday. (Past Indefinite) 3. Did you play the piano yesterday? (Past Indefinite) 4. Have you played the piano today? (Present Perfect) 5. What have you prepared for today? (Present Perfect) 6. Look at this birdhouse. Mike has made it himself. (Present Perfect). He made it last Sunday. (Past Indefinite) 7. Where have you put my pen? (Present Perfect). I cannot find it. 8. Have you seen Mary today? (Present Perfect) 9. When did you see Mary? — I saw her last week. (Past Indefinite) 10. Did your mother promise to take you to the theatre? (Past Indefinite)