1. What are you doing, are you writing, I have written,
I am working, when did you write, I finished.
2. I have already had.
3. What"s the weather like? Is it still raining?
— No, it has stopped raining.
4. I have lost.
5. I have not met.
6. Nina has just finished.
7. Where is Sergei, he has gone, he left.
8. What are you reading, I am reading.
9. They read, have you read.
10. My watch has stopped, there is.
11. Have you seen, I saw.
12. Have you heard, I have, when did you hear, I heard.
13. You have changed, has anything happened.