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Write the following sentences using Present Perfect Passive Voice.
Teenagers have broken a lot of trees.
Factories and plants have polluted our rivers. Bob has written the words “I love Helen” on the tree.
These children have dropped a lot of litter in the forest.
The pupils of 9 «A» class have collected 30 kilogram’s of wastepaper.

1 a lot of trees have been broken by teenagers.

2 our rivers have been polluted by factories and plants.

3 the word "I love Helen" have been written on the tree by Bob

4 a lot of litter have been dropped in the forest by these children.

5 30 kilogrammes of wastepaper have been collected by the pupils of 9A class.

A lot of Trees have been broken by teenagers.Our rivers have been polluted by factories and plants.The words “I love Helen” have been written by Bob on the tree.A lot of litter have been dropped by these children in the forest.30 kilograms of wastepaper have been collected by the pupils of 9 “A” class.