kotya997 Present Continuous.
1. The old man is walking in his room.
2. Peter is playing computer games.
3. They are having a big dinner together.
4. What they are talking about?
5. What language you are studying?
Present Simple.
1. We are interested in rock music.
2. My grandmother isn't nervous and she is rarely upset. 
3. My brother is at home.
4. Helen is a wonderful painter.
5. Do you have any idea where he is?
Past Simple.
1. I slept for two hours.
2. I did't believe him.
3. Did she know the truth?
4. I decided to join to fitness club.
5. I didn't open it.