The by phrase is located after the predicator (verb): Everyone saw the accident. [active] The accident was seen by everyone. [passive] In this example, the subject of the active clause appears in the passive as complement of the preposition "by" in a PP functioning as complement of "seen".
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The by phrase is located after the predicator (verb):
Everyone saw the accident. [active]
The accident was seen by everyone. [passive]
In this example, the subject of the active clause appears in the passive as complement of the preposition "by" in a PP functioning as complement of "seen".