-다가

-다가 means you were doing one thing and then stopped or switched to another: 'while doing A, (then) B'.

시간·순서Time & sequence

Han: With -다가 both clauses need the same subject; for a different subject use -(으)ㄹ 때.

Examples

책을 읽다가 잠이 들었어요.I fell asleep while reading a book.

집에 가다가 친구를 만났어요.I ran into a friend on my way home.

텔레비전을 보다가 전화를 받았어요.I was watching TV and then answered a phone call.

V+다가

가다 → 가다가, 공부하다 → 공부하다가

The subject of both clauses is the same.
-았/었다가 means A was completed first, then B happened: 갔다가 왔어요 'went and came back'.

Wrong: ~~저는 운동하다가 동생이 왔어요.~~

Right: 제가 운동하고 있을 때 동생이 왔어요.

With -다가 both clauses need the same subject; for a different subject use -(으)ㄹ 때.

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