por
preposition
· very common
1
by (agent)
"Fue escrito por Laura ayer."
It was written by Laura yesterday.
2
because of
"Llegué tarde por la lluvia."
I arrived late because of the rain.
3
through
"Pasé por tu calle ayer."
I passed through your street yesterday.
4
per
"Pago diez euros por día."
I pay ten euros per day.