1.it isn't cloudy yesterday

2. in 1990, we moved to another city

3. do they watch a good film on TV last night?

4. does Ba enjoy watching football?

5. it is still raining now

6. the students are running the school yard at the moment

7.the students are studying for exam now

8. Nam spend the most free time playing football

9.you should do your homework everyday

10.he always watches TV in the evening 

11. my mother never goes to work by bus

12. i brushes my teeth twice a day

13. where do you go last summer vacation?

14. there are many students in this room

15.she is interested to learn english in her freetime