V/A + -아/어서 (Nguyên nhân)V/A + -a/eoseo (reason)
Beginner 1 · #42Lesson 13: 생일 – Birthday

V/A + -아/어서 (Reason) – Because / since / so

Meaning: Because / since / so (expresses cause or reason)

Conjugation & Pattern

  • Stem vowel ㅏ, ㅗ + -아서
  • Other stem vowels + -어서
  • 하다 verbs/adjectives -> 해서 | Noun (N) + (이)라서

Detailed Usage

Links two clauses where the first clause (-아/어서) states the cause or reason for the result in the second clause.

Example Sentences

  1. 1

    배가 아파서 병원에 갔어요.

    Baega apaseo byeongwone gasseoyo.

    Because I had a stomachache, I went to the hospital.

  2. 2

    날씨가 좋아서 공원에서 산책했어요.

    Nalssiga jotaseo gongwoneseo sanchaekhaesseoyo.

    Since the weather was nice, I took a walk in the park.

  3. 3

    어제 바빠서 전화를 못 했어요.

    Eoje bappaseo jeonhwareul mot haesseoyo.

    Because I was busy yesterday, I couldn't call.

Important Notes

TWO STRICT RULES: 1) Never attach past (-았/었-) or future (-겠-) tense before '-아/어서' (use 먹어서, never 먹었어서). 2) The main clause CANNOT be an imperative (-(으)세요) or propositive (-(으)ㅂ시다) sentence.

Grammar Topics