1. I am going to give that cat some food. I am sure it is starving. - But Jane has already fed the cat. You needn't do it.
2. What you have you been doing here since morning?
3. 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.
4. He is running now. He has been running for ten minutes without any rest.
5. What are they doing now? They are working in the reading room. They have been working there for three hours already.
6. Where is he now? -- He is in the garden. He is playing basketball with his friends. They have been playing since breakfast time.
7. I live in St Petersburg. I have been living in St Petersburg since 1990.
8. This is the factory where my father works. He has been working here for fifteen years.
9. Have you found your note-book? -- No! I am still looking for it. I have already been looking for it for two hours, but haven't found it yet.
10. You have been playing with a ball for three hours already. Go home and do your homework.
11. Wake up! You have been sleeping for ten hours already.
12. I have been waiting for an answer from my cousin for a month already, but hasn't received it yet.