-느라고
because (I was busy) doing
Level 3 · Connective
Explanation
Being occupied with A caused a failure or bad result in B. Verb stems only, no tense before it, same subject in both clauses, and no command or suggestion afterwards.
Examples
시험 공부를 하느라고 잠을 못 잤어요.
I couldn't sleep because I was studying for the exam.
게임을 하느라고 전화를 못 받았어요.
I missed the call because I was playing a game.
이사 준비하느라고 정신이 없었어요.
I've been swamped preparing for the move.
TOPIK note
TOPIK II Reading 1–2 and Listening 13–16.