Looking Back

1. For ages . 11. For a long time .

2. Since three year ago . 12. Since march .

3. Since i had a holiday . 13. Since yesterday .

4. Since february . 14. Since i was ten .

5. For two day . 15. For an hour .

6. Since ten o'clock . 16. Since two days ago .

7. For a year . 17. Since may .

8. Since i got up this morning . 18. Since monday .

9. For ten hours . 19. For a day .

10. Since christmas . 20. For15 minutes .

1. For ages . 11. For a long time .

2. Since three year ago . 12. Since march .

3. Since i had a holiday . 13. Since yesterday .

4. Since february . 14. Since i was ten .

5. For two day . 15. For an hour .

6. Since ten o'clock . 16. Since two days ago .

7. For a year . 17. Since may .

8. Since i got up this morning . 18. Since monday .

9. For ten hours . 19. For a day .

10. Since christmas . 20. For15 minutes .

=> it's about 20km from my house to Ha noi

2 My brother often watched TV on his free time last year ,but he no longer does it

=> my brother used to watch TV on his free time

3 people in the countryside will use much biogas in the future

=> much biogas wil be used by people in countryside in the future