友達を見送るために駅にいった。

friend; companion

indicates direct object of action; indicates subject of causative expression; indicates an area traversed; indicates time (period) over which action takes place; indicates point of departure or separation of action; indicates object of desire, like, hate, etc.

to see someone off (at a station, an airport, etc.); to escort (e.g. home); to follow something with one's eyes until it is out of sight; to let pass; to pass up (an opportunity etc.); to let a pitch go by (baseball); to watch a batted ball go into the stands; to shelve (a plan etc.); to postpone; to have someone related or close to you die; to bury someone; to take care of somebody until he dies; to wait and see; to continue (e.g. in legal contexts)

for; for the sake of; to one's advantage; in favor of; in favour of; on behalf of; because of; as a result of

station

at (place, time); in; on; during; to (direction, state); toward; into; for (purpose); because of (reason); for; with; by; from; as (i.e. in the role of); per; in; for; a (e.g. "once a month"); and; in addition to; if; although

to go; to move (in a direction or towards a specific location); to head (towards); to be transported (towards); to reach; to proceed; to take place; to pass through; to come and go; to walk; to die; to pass away; to do (in a specific way); to stream; to flow; to continue; to have an orgasm; to come; to cum; to trip; to get high; to have a drug-induced hallucination