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Как-то так:

1. Не is running now. (present continuous) He has been running for ten minutes without any rest. (present perfect continuous)

2. What are they doing now?
- They are working in the rеading-room.They have been working there for aiready three hours.

3. Where is he now?
- He is in the garden. Не is playing volley-ball with friends. They have been playing since breakfast time. 

4. I live in St.Petersburg. I have lived in st. Petersburg since 1990. 

5. She has been already doing her homework for two hours; but she has not done half of it. 

6. I have been waiting for you since two o'clock.

7. What are you doing?
- I am reading. I have been reading for already two hours. I have already read sixty pages. 

8. This man is а writer. Нe writes books. He has been writing books since he was a young man. He has already written eight books. 

9. What have you been doing here since morning? 

10. Lena is a very good girl. She always helps her mother about the house. Today she has been helping her mother since morning. They have already washed the floor and dusted the furniture. Now they are cooking dinner together.

11. This is the factory where my father works. He has been working for fifteen years. 

12. Did you find your note-book?
- No! I am still looking for it. I have been already looking for it for two hours, but have not found it. 

13. You have been playing with a ball for already three hours. Go home and do your homework. 

14. Wake up! You have been sleeping for ten hours already. 

15. I have been waiting for a letter from my cousin for a month already, but have not received. 

15. It is difficult for me to speak about this орera as I have not heard it. 

16. I have just received a letter from my granny, but I have not yet received any letter from my parents. 

17. The weather is fine today. The sun has been shining ever since we got up. 

18. Every day I wind up my watch at 10 o'clock in the evening. 

19.Come along, Henry, what are you doing now?
I have been waiting for you a long time. 

20. Where are your gloves?
- I have put them into my pocket.