1, This tree was planted by my grandfather.

my grandfather planted this tree

2, A lot of work is done every day by us.

we do A lot of work every day 

3. The rubbish was collected yesterday evening.

they collected the rubbish yesterday evening.

4, Many trees are cut down to make paper.

they cut down many trees to make paper.

5, English is considered the most international language.

people consider English the most international language.

6, A new school will be built very soon by them?

will they build a new school very soon ?

7, These doors should be shut before 5 p.m.

they should shut these doors before 5pm

8, I was given a pretty painting on Chrismas by Nam.

Nam gave me a pretty painting at Chrismas

9, Is recycled paper used by us ?

do we use recycled paper ?

10, Many lakes and rivers were destroyed by pollution.

pollution destroyed Many lakes and rivers

11, The time machine will be shown to the public.

they will show the time machine to the public.

12, Old car tires are recycled to make shoes and sandals.

they recycle Old car tires to make shoes and sandals.

1. This tree was planted by my grandfather.
2. The rubbish hasn't been collected.
3. Is recycled paper being used?
4. Will a new school be built very soon?
5. A lot of work is done by him every day.
6. Many trees are cut down to make paper.
7. English is considered the most international language.
8. These doors should be shut before 5 pm.
9. Many lakes and rivers have been destroyed by pollution from factories.
10. I was given a beautiful glass on my birthday by Hung.
11. Rice is grown in most Asian countries.
12. Some funny stories are told by Tuyen.
13. After class, the chalkboard is always erased by one of the students.
14. The project will be completed next month.
15. Language skills are taught in every school in the country.
16. The project had been finished by 4 pm yesterday.