He is lost in thought.
Kare wa shian ni kureteiru.
he; him; his; boyfriend
topic marker particle; indicates contrast with another option (stated or unstated); adds emphasis
thought; consideration; deliberation; reflection; rumination; pondering
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 get dark; to end; to come to an end; to close; to run out; to be sunk (e.g. in despair); to be lost
Readings: ヒ、 かれ、 かの、 か.の
Meanings: he, that, the
Readings: シ、 おも.う、 おもえら.く、 おぼ.す
Readings: アン、 つくえ
Meanings: plan, suggestion, draft, ponder, fear, proposition, idea, expectation, worry, table, bench
Readings: ボ、 く.れる、 く.らす
Meanings: evening, twilight, season's end, livelihood, make a living, spend time