1. How does Nam go to school ?
2. What does your grandfather often do every afternoon ?
3. Where there are a lot of trucks and cars in rush hour ?
4. A new school will be built for poor children next week 
5. These chemicals are sold everywhere in my hometown
6. We used to live in a flat when I was a child
7. People didn't use to have mobile phone 20 years ago
8. Did Jim use to go swimming every weekend ?
9. My father used to smoke 5 years ago but now he doesn't anylonger
10. Lyli didn't use to smoke but now she makes dinner everyday
11. We will be going to Hue at this time tomorrow
12. A new school will be built here next year
13. This school bag is mine 
14.That car is hers
15. That bike ís theirs
16. I will be playing tennis at that time tomorrow
17. This shop doesn't open at 5.00pm on Sunday
18. We'll be listening to pop musicat this time tomorrow
19.By this time next month, I won't be driven this car
20. Do you play football or basketball at school ?