The Agent in Passive Sentences
We often use the passive when we are interested in the object rather than the “doer” of the action. If we are interested we usually use a phrase beginning with the word by and then the person or thing that does the action – also known as the Agent.
- 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.