He was affected by the heat.
Kare wa atsusa ni aterareta.
he; him; his; boyfriend
topic marker particle; indicates contrast with another option (stated or unstated); adds emphasis
hot (weather, etc.); warm
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 hit; to expose; to apply (e.g. patch); to put on; to put against; to hold on; to hold against; to allot; to call on someone (e.g. in class); to guess (an answer); to make a hit (e.g. in a lottery)