彼はそこへ泳ぎに行ったが、おぼれてしまっただけであった。

he; him; his; boyfriend

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

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")

swimming

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

indicates sentence subject (occasionally object); indicates possessive (esp. in literary expressions); but; however; still; and

to drown; to nearly drown; to sink below the surface (of water); to indulge in; to lose one's head over something; to wallow in

only; just; merely; simply; no more than; nothing but; alone; as (e.g. as soon as, as much as); worth

be; is; indicates past or completed action; indicates light imperative

a certain ...; some ...