Definition
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by
The word 'by' indicates the means or agent through which something is done.
La palabra 'por' indica el medio o agente a través del cual se realiza algo.
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The book was written by a famous author.
El libro fue escrito por un autor famoso.
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I traveled by train to the city.
Viajé por tren a la ciudad.
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She was standing by the window.
Ella estaba de pie por la ventana.