He fell down on the floor.
Kare wa yuka ni taoreta.
he; him; his; boyfriend
topic marker particle; indicates contrast with another option (stated or unstated); adds emphasis
bed; bedding; sickbed; alcove; riverbed; seedbed; straw "core" of a tatami mat; floor
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 fall; to collapse; to drop; to fall senseless; to be forced to bed (by illness, etc.); to die; to go bankrupt; to be ruined; to have a bad debt; to be defeated (in a game); to fall (of governments, dictators, etc.)