elementary · freeInteractive lesson
고 vs 아서/어서 (sequence)
Try it freeContrast quizPick the right form in a mini quiz.Open →Explanation
V-고 links actions or qualities: 먹고 가요; 예쁘고 똑똑해요.
-아서/어서 can mark natural sequence or reason: 가게에 가서 샀어요.
For tight “as soon as,” prefer -자마자 over either form.
Mistake: chaining five -고 clauses when a reason or time connector is clearer.
Level: elementary. Read both sides of the contrast, say the examples out loud, then write one correct and one incorrect sentence and fix it.
Cross-link: open the related grammar or tools page the same day so the fix sticks in your study graph.
Examples
양치하고 자요.
I brush my teeth and sleep.
집에 가서 쉴 거예요.
I’ll go home and (then) rest.
Common mistakes
- Translating the English pair word-for-word without checking which Korean form carries the real distinction.
- Treating the two forms as free synonyms after memorizing only one example.
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