It wasn’t good that you fell asleep so late in Korean 🇰🇷

Sentence info.

네가 (nega) – "you" with the subject particle "가."
너무 (neomu) – "too" or "excessively."
늦게 (neutgae) – the adverbial form of "늦다" (“to be late”), meaning "late."
잠든 (jamdeun) – the adjective form derived from the verb "잠들다" (“to fall asleep”), in its past tense form meaning "fell asleep."
건 (geon) – a contraction of "것" (“thing” or “fact”), turning the previous clause into a nominalized idea: “the fact that you fell asleep.”
좋지 않았어 (jochi anasseo) – "was not good," where "좋다" means "to be good" and it’s negated and made past informal.

Translation: "It wasn’t good that you fell asleep so late."

Alternate expressions:
• 네가 너무 늦게 잤던 건 좋지 않았어.
 (Romanized: nega neomu neutgae jatdeon geon chóchi anasseo.)
 Here, "잤던" (past form of "자다" – “to sleep”) is used instead of "잠든."

• 네가 이렇게 늦게 잠들어서 좋지 않았어.
 (Romanized: nega ireohge neutgae jamdeureoseo chóchi anasseo.)
 This version uses "이렇게" (“so” or “this way”) and a connective ending "어서" to link falling asleep late with the negative evaluation.

Tip for remembering: Notice that Korean often nominalizes a clause with "것" (here contracted to "건") to express abstract statements like “the fact that…”. Also, adverbs like "너무" (too) and "늦게" (late) are placed immediately before the verb or adjective they modify, and the subject “네가” comes at the very beginning.

a few seconds ago