彼は英語を学ぶためそこへ行った。

he; him; his; boyfriend

topic marker particle; indicates contrast with another option (stated or unstated); adds emphasis

English (language)

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 study (in depth); to learn; to take lessons in

good; advantage; benefit; welfare; sake; purpose; objective; aim; consequence; result; effect; affecting; regarding; concerning

there (place relatively near listener); there (place just mentioned); that place; then (of some incident just spoken of); that (of point just raised); you

indicates direction or goal (e.g. "to")

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