1 ⇒It's important to keep the environment clean

2.⇒The room was cleaned by Nam THE BEFORE DAY.
3⇒A new bridge has just been built in the area.
4⇒Shall we go to the beach this weekend?
5⇒Although he had a headache, he still went to work.
6⇒She has worked as a secretary for 5 years.
7⇒Because his leg was broken, he didn’t take part in the contest yesterday.
8⇒Although the weather was bad, we went out for a picnic
9⇒ Rice is grown in tropical countries.

10⇒It takes me three hours to do my homework every day

11⇒My father enjoys watching television everynight

12⇒She wishes she spent her vacation in Ha Long Bay.

13⇒He used to have a lot of money.

14⇒It has been discovered that there is water on Mars.

15⇒It is expected that the professor will arrive this morning.

16⇒ I used to stay up late to watch football matches last year.

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10. It's very important to keep the environment clean.
11. The room was cleaned by Nam yesterday.
12. A new bridge has just been built in the area.
13. Shall we go to the beach this weekend?
14. Although he had a headache, he still went to work.
15. She has worked as a secretary for five years.
16. Because he broke his leg, he didn't take party in the contest yesterday.
17. Although the weather was bad, we went out for a picnic.
18. Rice is grown in tropical countries.
19. It takes me three hours to do my homework everyday.
20. My father enjoys watching television every night.
21. She wishes she spent her vacation in Ha Long Bay.
22. He used to have a lot of money.

23. It has been discovered that there is water on Mars.
24. It is expected that the professor will arrive this morning.
25. I used to stay up late to watch football matches last year.
II/
1. He has played the piano since 2015.