When we change the original sentences from active to passive voice, we get the following sentences:
In the active voice, the subject of the sentence is the performer of the action indicated by the verb. The receiver of the action is the object. Example: I left your package outside.
In the passive voice, the subject is the receiver of the action indicated by the verb. The performer is now the agent, which comes after the preposition "by". Example: Your package was left outside by me.
Learn more about active and passive voice here:
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