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