1. Mary finished school 10 years ago. 2. He has written a letter and now he is going to send it. 3. Last weekend they went to the sea. 4. When did you come? 5. I have not decided yet where to go this weekend. 6. John left his bag in the library last Monday. 7. Harry and Jane have bought a new TV set and now are enjoying a film. 8. His grandfather died when he was a child. 9. Clara has never been abroad. 10. John has not arrived yet.