1. My room-mates have done their homework. Now they can go to a skating-rink with me. (Present Perfect);2. The pupils had translated the text before the bell rang. (Past Perfect);3. Have you been to Warsaw? (Present Perfect);4. He will have received the telegram by tomorrow. (Future Perfect);5. I have already sent the message. (Present Perfect); 6. Yesterday Kate had done her lessons by eight o’clock. (Past Perfect); 7. By this time tomorrow you will have taken your examination. (Future Perfect); 8. We haven\'t received any letters from her lately. (Present Perfect); 9. The girls had cleaned the room by the time their mother came back home. (Past Perfect);10. The children had fallen asleep by ten o’clock. (Past Perfect);11. I have just seen him. (Present Perfect).