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.