Question

Раскройте скобки, используя Present Perfect, Present Continuous, Present Indefinite или Past Indefinite.
можно еще м кратким объямнением почему именно так сделали ))) Заранее большое спасибо)

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) a detective story.
6. They (to read) "War and Peace" a month ago. What about you? You (to read) this novel?
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 in the morning.
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. Tom, let's have dinner. - No, thank you, I already (to have) dinner.
13. What the weather (to be) like? It still (to rain)? - No, it (to stop) raining.

Answer 1

1. Please, give me a pencil, I have  lost mine. (Present Perfect) 
2. I haven't  met Peter since Monday.  (Present Perfect) 
3. Nina has just finished work. 
4. Where is Sergei ? - He has gone home. He  left the room a minute ago. 
5. What are you reading now? - I am reading a detective story. 
6. They read "War and Peace" a month ago. What about you? Have you  read this novel? 
7. My watch has stopped. There is something wrong with it. 
8. Have you  seen Jack today? -Yes, I have seen him at the Institute in the morning. 
9. Have you  heard the new symphony by M.? - Yes, I have - When did you hear it? - I heard it last Sunday. 
10. You have changeed so much. Anything has happened? 
11. What are you doing here at such a late hour?  Are you  writing your composition? - No, I have already writen it . I am working at my report. - And when did you write your composition? - I  finished it two days ago. 
12. 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.