Question

1. Please give me a pencil, I (to lose) mine. 2. I (not to meet) Peter since Monday. 3. Nina just (to finish) work. 4. Where Sergei (to be)? — He (to go) home. He (to leave) the room a minute ago. 5. What you (to read) now? — I (to read) "Jane Eyre" by Charlotte Bronte. 6. They (to read) "Ivanhoe" by Walter Scott a month ago. What about you? You (to read) "Ivanhoe"? 7. My watch (to stop). There (to be) something wrong with it. 8. You (to see) Jack today? — Yes, I (to see) him at the institute. 9. You (to hear) the new symphony by M.? — Yes, I... . — When you (to hear) it? — I (to hear) it last Sunday. 10. You (to change) so much. Anything (to happen)? 11. What you (to do) here at such a late hour? You (to write) your composition? — No, I (to write) it already. I (to work) at my report. — And when you (to write) your composition? — I (to finish) it two days ago. 12. I say, Tom, let's have dinner. — No, thank you, I al-I ready (to have) dinner. 13. What the weather (to be) like? It still (to rain)? — No, it (to stop) raining.
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Answer 1

1/ I have lost mine.
2/ I have not met
3/ Nina has just finished. 
4/ Where is Sergei, he has gone, he left. 
5/ What are you reading, I am reading. 
6/ They read, have you read.
7/ My watch has stopped, there is. 
8/ Have you seen, I saw. 
9/  Have you heard, I have, when did you hear, I heard. 
10/ You have changed, has anything happen
11/ What are you doing here at such a late hour? Are you writing  your composition? - No, I have written  it already. I am working at my report. - And when did you write  your composition? – I finished  it two days ago. 12/ I said  Tom let’s have dinner. - No, thank you, I have already had  dinner. 13/ What is the weather  like? Is it still raining ? - No, it has stopped raining