彼は帽子を頭に載せた。

he; him; his; boyfriend

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

hat; cap

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.

head; hair (on one's head); mind; brains; intellect; leader; chief; boss; captain; top; tip; beginning; start; head; person; top structural component of a kanji

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 place on (something); to give (someone) a ride; to give a lift; to pick up; to help on board; to load (luggage); to carry; to take on board; to send out (on the airwaves, etc.); to deceive; to take for a ride; to (sing) along with (musical accompaniment); to let (someone) take part; to excite (someone); to publish (an article); to run (an ad)