Grade 7 Grammar Lesson 6 The passive voice
The passive voice is generally preferred when a vague noun or pronoun such as somebody, someone, something, nobody, people, they, we etc would be the doer of the action.
The second sentence is preferred over the first one because we don’t know the doer or the agent.
Here too, the second sentence would be preferred because the doer needn’t be mentioned.
NOTE :It is unusual to mention the doer (by agent) in such cases.
A sentence with nobody, no one etc has the negative verb in passive voice.