We are normally not interested in
the "doer" of an action in a passive sentence. When we want to
mention the "doer", we use the preposition by. The whole phrase is
called by-agent in English.
|
Active
sentence
|
Passive
sentence
|
|
Mr Brown built the house.
|
The house was built by Mr Brown.
|
When we do not know, who was the
"doer" of the action, we use someone or somebody in the active
sentence. We leave out these words in the passive sentence.
|
Active
sentence
|
Passive
sentence
|
|
Someone stole my bike.
|
My bike was stolen.
|
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