Without knowing the meaning of the phrase that you use "tomar ... por", I think is the same as "take... for " in English in the sense of confusion. "TOMAR a alguien POR tonto" (take someone for a fool). In Spanish there're, however, other ways to use "tomar...por" with a different meaning: "TOMAR POR la fuerza algo" (take something by force) "TOMAR un alimento POR hambre" (take a food for hungry) "TOMAR el pedido POR teléfono" (take the order on the phone) ...