'detrás de' or 'por detrás de'?
"La dirección está por detrás de esta carta".
What's the difference between 'detrás de' and 'por detrás de' here?
2 Answers
If you said, "Está detrás de esta carta," that would mean it's behind this letter. On some other object behind it.
"Está por detrás de esta carta," means it's on the back of the letter. Actually written on the same object, but on the back side.
For the letter I would say La dirección está al reverso de esta carta. But if a return address is being discussed, then sobre (envelope) would used in place of carta.
Por atrás indicates an approximate location, ie: Yo vivo por atrás de aquel edificio (I live behind that building).
Detrás de mi casa tengo un jardín (exactly behind the house).