ㄷ(디귿) 불규칙

In some verbs ending in ㄷ, the ㄷ turns into ㄹ before an ending that starts with a vowel: 듣다 'listen' → 들어요.

문장 끝·말투Endings & speech style

Han: 듣다 is ㄷ-irregular: before -어요 the ㄷ becomes ㄹ.

Examples

저는 지하철에서 한국 노래를 들어요.I listen to Korean songs on the subway.

모르는 단어는 선생님께 물어보세요.Ask the teacher about words you don’t know.

학교까지 걸어서 십 분 걸려요.It’s a ten-minute walk to school.

ㄷ(디귿) 불규칙vs묻다 (ask) / 묻다 (bury)Same dictionary form, different verbs: 'ask' is irregular (길을 물어요), 'bury' is regular (땅에 묻어요).

stem in ㄷ+vowel ending (-아/어, -(으)) → ㄷ becomes ㄹ: 듣+어요 → 들어요

듣+으세요 → 들으세요

듣다 → 들어요, 들었어요, 들으세요, 들으면; 걷다 → 걸어요; 묻다 (ask) → 물어요

Before -아/어 and -(으) endings, ㄷ becomes ㄹ: 듣다 → 들어요, 들으면; 걷다 → 걸어요, 걸으세요; 묻다 'ask' → 물어요; 싣다 'load' → 실어요.
This new ㄹ is not an ㄹ-stem: 으 stays and nothing drops, so 들으세요 and 걸으면 (not 드세요, 걸면).
Before consonant endings ㄷ stays: 듣고, 듣지만, 듣습니다, 걷는.
Many ㄷ verbs are regular: 받다 → 받아요, 닫다 → 닫아요, 믿다 → 믿어요, 얻다 → 얻어요, and 묻다 'bury' → 묻어요.

Wrong: ~~매일 아침 음악을 듣어요.~~

Right: 매일 아침 음악을 들어요.

듣다 is ㄷ-irregular: before -어요 the ㄷ becomes ㄹ.

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