6. She is going to build a new apartment here
7. The teacher tells a story. → …………………………………………………………………. 
8. The teacher told a story → ………………………………………………………………….
 9. The teacher has told a story → ………………………………………………
10. Somebody has taken my books away. → ………………………………………
11. Somebody takes my books away. → …………………………………
12. Somebody took my books away. 
13. They clean the wall before they paint it. → ………………………………………
14. They cleaned the wall before they painted it. → …………………………………………
15. Mr. Cole visited John at the weekend. → …………………………
16. Mr. Cole usually visits John at the weekend. → ……………………………………
17. Mr. Cole has visited John many times → ……………………………
18. Science and technology have completely changed human life. → 
19. They found the book on the floor → ……………………
20. They find the books in the desk → ………………………
21. They have found the keys in the drawer → …………………………
22. They don’t finish the work in time → …………………………
23. Do You finish the work in time ? → ……………………
24. Did You finish the work in time ? → …………………………
25. You finish the work in time → ………………………………
26. They didn’t call my name. → ……………………………
27. They don’t call my name → ………………………
28. They haven’t called my name → ……………………………
29. Has she written a poem? → ………………………… 
30. Has your mother made a big cake for the next party? → 
31. Did your mother make a big cake for the party? → 
32. Does your mother make a big cake for the party? → 
33. Please wait here until they examine your luggage → 
1. She is cleaning a window.
2. Nina is taking a photo.
3. Sam is learning English at the moment.
4. I am building my house.
5. They are writing a report now.
6. We are reading novels right now.
7. Someone is sweeping the floor.
8. I am doing my exercise now.
9. Somebody is singing my favorite songs now.
10. I am fixing my car.
1. I was reading books at 7 o’clock yesterday morning.
2. They were breaking television at 9 o’clock last night.
3. Nina was singing a song when you came.
4. While Ms. Nina was cleaning the house, she hurt her back.
5. They were decorating their house when you phoned.
6. I was eating a sandwich.
7. I was writing an important report.
8. She was not cleaning her room at 9 o’clock yesterday evening.
9. Mr. Sam was reading newspaper.
10. We were washing the dishes when you called.
1. You can't wash this dress.
2. You should open the wine about 3 hours before you use it.