por and para

Por means:	Para means:
1. on account of or because	in order to or for the purpose of
2. through, along, by, around, in the area of	by or for when referring to a specific time
3. refers to lengths of time and means during or for	to, for, or in the direction of when referring to a specific place
4. in situations using money means in exchange for	Estar + para + infinitive means to be ready to
5. per or by
6. to be in favor of
7. by means of
8. for, as is, in place of
9. *used with ser in the passive voice
Ejemplos con por:
Lo hice por la lluvia.	I did it because of the rain.
España es famoso por el vino de Jerez.	Spain is famous for sherry wine.
Caminé por el río.	I walked along (by) the river.
Nadie viene por aquí.	Nobody comes around here.
Viajaremos por tres meses.	We will travel for three months.
Pagué cien dólares por mi abrigo.	I paid $100 for my coat.
Tengo dos semanas de vacaciones por año.	I have two weeks of vacation per year.
Voté por la señora Moreno.	I voted for Mrs. Moreno.
Van por avión.	They are going by plane.
En mi país me toman por extranjera.	In my country they take me for a foreigner.
*El libro fue escrito por Gabriel Márquez.	*The book was written by Gabriel Márquez.
Ejemplos con para:
Hago ejercicio para descansar de mi trabajo.	I exercise (in order to) rest from my work.
Este regalo es para ti.	This gift is for you.
Lo hice para el bien de la humanidad.	I did it for the (benefit) good of humanity.
Necesito el libro para mañana.	I need the book for tomorrow.
Salgo para Europa en tres días.	I leave for Europe in three days.
Estamos para salir ya.	We're ready to leave now.

Por means:

Para means:

Ejemplos con por:

Ejemplos con para: