grammar.prepositions.por-uses
Por: cause, exchange, movement through, duration
Cause/motive (por eso, gracias por), exchange and price (lo compré por 50), movement through/around (por el centro), duration (por dos horas), agent of passives, means (por correo).
⚠ Stub: AI-drafted outline, not yet reviewed. The structure is permanent; the content will be expanded.
grammarB1stubdraftv0.1.0
Explanation
Por looks backward or through: reason (lo hice por ti), exchange (te cambio esto por aquello), route (pasamos por Cochabamba), approximate place/time (por aquí, por la mañana), means (por teléfono), rate (por hora), and the passive agent (fue escrito por...).
Set phrases worth learning whole: por favor, por supuesto, por fin, por lo menos, por si acaso. The full contrast with para has its own rule.
Examples
Thanks for your help.
Region: global
We went through/by the market before coming back.
Region: global