Example: Shakespeare didn't write War and Peace!
War and Peace wasn't written by Shakespeare!

1) Pollution harms the environment.
The environment
2) Our school prefers modern teaching methods.
Modern teaching methods
3) A teacher from our school won the marathon.
The marathon
4) Van Gogh painted this picture of sunflowers.
This picture of sunflowers
5 Orlando Bloom plays the part of Legolas.
The part of Legolas
6 My father built this house before I was born.
This house .​

1) The environment is harmed by pollution.
Explanation: In this sentence, the main subject is "pollution", and the verb is "harms". The object that is affected by the action of the verb is "the environment". So, we can say that pollution causes harm to the environment.

2) Modern teaching methods are preferred by our school.
Explanation: In this sentence, the subject is "our school", and the verb is "prefers". The object that is preferred by the school is "modern teaching methods". So, we can say that our school likes and chooses to use modern teaching methods.

3) The marathon was won by a teacher from our school.
Explanation: In this sentence, the main subject is "a teacher from our school", and the verb is "won". The object that is affected by the action of the verb is "the marathon". So, we can say that a teacher from our school achieved victory in the marathon.

4) This picture of sunflowers was painted by Van Gogh.
Explanation: In this sentence, the main subject is "Van Gogh", and the verb is "painted". The object that was created as a result of the action of the verb is "this picture of sunflowers". So, we can say that Van Gogh is the artist who created this particular picture of sunflowers.

5) The part of Legolas is played by Orlando Bloom.
Explanation: In this sentence, the main subject is "Orlando Bloom", and the verb is "plays". The object that is represented or acted out by the subject is "the part of Legolas". So, we can say that Orlando Bloom is the actor who plays the character Legolas in a movie or play.

6) This house was built by my father before I was born.
Explanation: In this sentence, the main subject is "my father", and the verb is "built". The object that was created as a result of the action of the verb is "this house". So, we can say that my father constructed or made this house before I came into existence.