10. We have not lived in England for 2 years now.
11. They are preparing the Christmas dinner at the moment.
12. George has worked at the university so far.
13. She has been learning German for two years.
14. Look! That man is trying to open the door of your car.
15. Listen! They are learning a song.
16. David is repairing the TV set at the moment. He has been working at it for one hour.
17. I can't go because I have not finished my homework yet.
18. John is washing his hands now. He has just repaired a new bike.
19. I have been working on my report since Monday. Now I am writing the conclusion.
20. The earth circles the sun.