2. We haven't met him for ages.

3. They have lived in Viet Nam for ten years.

4. He started to collect stamps three years ago.

5. It took us five hours to redecorate our house before Tet.

6. She is not old enough to see this movie.

7. It took me two days to travel to that town.

8. It took me three hours to write this essay.

9. Why don't we visit the museum next Sunday?

10. He is not tall enough to reach the top shelf.

11. Vicky is not old enough to join the club.

12. I spend two hours preparing dinner.

- S + be + not + adj + enough + to-V = S + be + too + adj + to-V

- S + spend + time + V-ing + O = It + take/took + SO + time + to-V + O

- S + started/began + to-V/V-ing + when.../... ago = S + HTHT/HTHTTD + for/since...