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When to name the agent and when to leave it out.
Why you specifically
The rule
In the passive voice, the subject receives the action. If you want to name who did the action, use by + agent: The house was built by my uncle. If the agent is not important, unknown, or obvious, leave it out: The house was built in 1998. In English, by is the normal word for the agent in passive sentences; from, with, and to do not work in this structure.
The trap
The letter was written from my sister.
The letter was written by my sister.
Use by + agent to show who did the action in a passive sentence.
The cake was made with the chef.
The cake was made by the chef.
By shows the agent, the person or thing that performed the action.
The room was cleaned from the staff.
The room was cleaned by the staff.
In a passive sentence, by introduces the doer of the action; from does not work here.
The song was sung to a famous singer.
The song was sung by a famous singer.
Use by before the person who performed the action in the passive.
Prove it
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