~았/었다가 - But/And Then Verb - 았/었다가
Explanation of ~았/었다가
This Korean grammar ~았/었다가 is used when the speaker indicates that the subject preforms an action, after the action performed in the first clause is completed. The action in the second clause can be used as past, present or future. This grammar is also often shortened to 었/았다, but either way if is fine.
- 서점에 갔다가 친구를 만났어요. I went to the shops and then met a friend.
- 갈때는 기분이 좋았다가 지금은 나빠졌어. On the way there i was feeling good but now i am feeling bad.
- 파지를 샀다가 마음에 안 들어서 환복했어요. I bought a pair of pants but then didn’t like it, so i returned it.