Por vs. Para

motive

Yet to be done

because of (cause)

by means of (trans/comms)

rate (speed/percentage (por ciento = percent)

object of an errand

object as the focus of a sentence (passive voice)

movement through space

taking the place of

exchange

duration

purpose

effect ("in order to")

recipient

future dates (deadlines)

employment

comparison (exception to a generalization)

conclusion (viewpoint)

towards (destination)