Switching and discovering: -다가 and its family
B1 -다가·-았다가·-다 보니·-다 보면 50 / 68
In short
Korean builds a whole family on the connector -다(가): -다가 breaks off or switches an action mid-way (밥을 먹다가 나갔어요, babeul meokdaga nagasseoyo, I was eating and then went out); -았/었다가 completes an action and then reverses it (갔다가 왔어요, gatdaga wasseoyo, went and came back); -다가는 warns you (하다가는 다쳐요, hadaganeun dacheoyo, keep it up and you’ll get hurt); and -다 보니까 / -다 보면 report what you discover, or will discover, by doing something. For -다가 the two clauses must share one subject.
The rule
Everything here hangs off the plain connective -다가, which attaches straight to the plain verb stem - no 으-insertion, no 받침 choice, and a ㄹ-stem keeps its ㄹ: 가다 -> 가다가 (gadaga), 먹다 -> 먹다가 (meokdaga), 열다 -> 열다가 (yeoldaga, not *여다가). The only real conjugation work is the ordinary 아/어 harmony inside the past form -았/었다가.
Step 1 - Interruption / switch: -다가
Verb stem + -다가 means you were doing A and then broke it off, or switched to B, part-way through - A never got finished. The subject is the same for both clauses: 밥을 먹다가 나갔어요 (I was eating and left in the middle of it). In speech it often shortens to bare -다, but write -다가.
Step 2 - Accidental result: -다가
The same -다가 covers an unintended outcome, especially with a motion or process verb: 뛰어가다가 넘어졌어요 (ttwieogadaga neomeojeosseoyo, I was running and (accidentally) tripped). Still same subject, still mid-action - the second clause is what A ran into.
Step 3 - Complete, then reverse: -았/었다가
Put the past -았/었- on the stem first, then -다가: now A is fully completed and B undoes or reverses it. It wants a round-trip or an opposite pair - go/come, buy/refund, open/close: 갔다가 왔어요 (went and came back), 샀다가 환불했어요 (satdaga hwanbulhaesseoyo, bought it and got a refund), 열었다가 닫았어요 (yeoreotdaga dadasseoyo, opened it and closed it). The 아/어 is normal harmony: 가 -> 갔다가, 먹 -> 먹었다가, 하 -> 했다가.
Step 4 - Warning: -다가는
Add 는 to -다가 (colloquially clipped to -다간): “if you keep doing A like this, B (something bad) will follow.” It almost always lands on a negative result: 그렇게 하다가는 다쳐요 (geureoke hadaganeun dacheoyo, if you keep doing it like that, you’ll get hurt).
Step 5 - Realization through doing: -다(가) 보니(까)
The 가 usually drops, leaving -다 보니까 (or -다 보니). 보다 is an auxiliary verb, so it keeps a space. Meaning: in the course of doing A, I came to notice / reach B - a discovery already made (often past): 하다 보니까 재미있어요 (hada bonikka jaemiisseoyo, as I kept doing it, I found it’s fun). Mind the space: 하다 보니까, never *하다보니까.
Step 6 - If you keep doing: -다(가) 보면
Same auxiliary 보다, but with the conditional -(으)면: “if you keep doing A, eventually B” - a forward-looking, general prediction: 하다 보면 늘어요 (hada bomyeon neureoyo, if you keep doing it, you’ll get better).
Forms & patterns
The family at a glance:
| Pattern | Attaches to | Meaning | Example |
|---|---|---|---|
| -다가 | plain stem | A interrupted / switched to B | 먹다가 나갔어요 (meokdaga nagasseoyo) ate a bit, then left |
| -다가 | plain stem (motion) | A leads to an accidental B | 뛰어가다가 넘어졌어요 (ttwieogadaga neomeojeosseoyo) ran and tripped |
| -았/었다가 | past stem | A completed, then reversed | 갔다가 왔어요 (gatdaga wasseoyo) went and came back |
| -다가는 | plain stem | warning: keep doing A -> bad B | 하다가는 다쳐요 (hadaganeun dacheoyo) keep it up and you’ll get hurt |
| -다(가) 보니(까) | plain stem + 보다 | realized B through doing A | 하다 보니까 재미있어요 (hada bonikka jaemiisseoyo) doing it, I found it fun |
| -다(가) 보면 | plain stem + 보다 | if you keep doing A, then B | 하다 보면 늘어요 (hada bomyeon neureoyo) keep at it and you’ll improve |
How it attaches - plain -다가 has no allomorph split; the work is the 아/어 of the past form:
| Stem type | plain -다가 | past -았/었다가 |
|---|---|---|
| vowel stem 가다 (gada) go | 가다가 (gadaga) | 갔다가 (gatdaga) |
| 받침 stem 먹다 (meokda) eat | 먹다가 (meokdaga) | 먹었다가 (meogeotdaga) |
| ㄹ-stem 열다 (yeolda) open | 열다가 (yeoldaga) | 열었다가 (yeoreotdaga) |
| 하다 verb 하다 (hada) do | 하다가 (hadaga) | 했다가 (haetdaga) |
-다가 vs -(으)면서 vs -아/어서 - three ways to join two clauses (all with 가다, go):
| Ending | How A and B relate | Same subject? | Example |
|---|---|---|---|
| -다가 | A is broken off / switched to B | required | 가다가 친구를 만났어요 (gadaga chingureul mannasseoyo) met a friend on the way |
| -(으)면서 | A and B happen at the same time | required | 가면서 노래를 불러요 (gamyeonseo noraereul bulleoyo) sings a song while going |
| -아/어서 | A finishes, then B builds on it | required | 가서 친구를 만났어요 (gaseo chingureul mannasseoyo) went, then met a friend there |
Examples
- 밥을 먹다가 전화를 받았어요. (Babeul meokdaga jeonhwareul badasseoyo.) - I was eating and (then) took a phone call.
- 텔레비전을 보다가 잤어요. (Tellebijeoneul bodaga jasseoyo.) - I was watching TV and fell asleep.
- 학교에 가다가 친구를 만났어요. (Hakgyoe gadaga chingureul mannasseoyo.) - On my way to school, I ran into a friend.
- 뛰어가다가 넘어졌어요. (Ttwieogadaga neomeojeosseoyo.) - I was running and tripped.
- 은행에 갔다가 왔어요. (Eunhaenge gatdaga wasseoyo.) - I went to the bank and came back.
- 옷을 샀다가 환불했어요. (Oseul satdaga hwanbulhaesseoyo.) - I bought the clothes and then returned them.
- 창문을 열었다가 닫았어요. (Changmuneul yeoreotdaga dadasseoyo.) - I opened the window and (then) closed it.
- 그렇게 뛰다가는 넘어져요. (Geureoke ttwidaganeun neomeojeoyo.) - If you keep running like that, you’ll fall.
- 한국어를 공부하다 보니까 재미있어요. (Hangugeoreul gongbuhada bonikka jaemiisseoyo.) - As I study Korean, I find it fun.
- 자꾸 하다 보면 늘어요. (Jakku hada bomyeon neureoyo.) - If you keep doing it, you’ll get better.
Common mistakes
- 제가 자다가 동생이 왔어요. (Jega jadaga dongsaengi wasseoyo.) -> 제가 자는 동안 동생이 왔어요. (Jega janeun dongan dongsaengi wasseoyo.) - -다가 needs the same subject in both clauses; when the subjects differ, use -는 동안. While I was sleeping, my younger sibling came.
- 밥을 먹었다가 나갔어요. (Babeul meogeotdaga nagasseoyo.) -> 밥을 먹다가 나갔어요. (Babeul meokdaga nagasseoyo.) - for an action broken off mid-way, use the plain stem + -다가; -았/었다가 would mean you finished eating and then reversed it, which doesn’t fit. I was eating and (then) went out.
- 가다가 왔어요. (Gadaga wasseoyo.) -> 갔다가 왔어요. (Gatdaga wasseoyo.) - “went (all the way) and came back” needs the completed -았/었다가; plain 가다가 왔어요 means you turned back part-way. I went and came back.
- 하다보니까 재미있어요. (Hadabonikka jaemiisseoyo.) -> 하다 보니까 재미있어요. (Hada bonikka jaemiisseoyo.) - 보다 here is an auxiliary verb, so it keeps a space, like 먹어 보다 and 가고 있다. As I do it, I find it fun.
- 하다 보면 재미있었어요. (Hada bomyeon jaemiisseosseoyo.) -> 하다 보니까 재미있었어요. (Hada bonikka jaemiisseosseoyo.) - -다 보면 is hypothetical (“if you keep doing it, then…”), so it can’t report a result you already reached; a realization already arrived at takes -다 보니까. As I kept doing it, I found it fun.
Tips
- -다가 is a mid-action pivot. The first action is left unfinished - it stops the moment the second begins. Contrast -고 (do A, finish it, then B) and -(으)면서 (A and B at the same time): only -다가 says “in the middle of A.”
- -았/었다가 wants a round-trip. It shines with paired opposites - 가다/오다 (go/come), 사다/환불하다 (buy/refund), 켜다/끄다 (turn on/off), 열다/닫다 (open/close), 입다/벗다 (put on/take off). A is completed, then B undoes it. If A and B aren’t a natural there-and-back, you probably want plain -다가.
- 보니까 looks back, 보면 looks forward. -다 보니까 = “having kept doing A, I came to realize B” (a discovery already true, often past). -다 보면 = “if you keep doing A, you’ll reach B” (a general prediction, still hypothetical). Same 보다, opposite time direction.
- -다가는 is a warning label. Read it as “keep doing A (badly) and B (bad) will happen”: 다쳐요 (you’ll get hurt), 늦어요 (you’ll be late), 넘어져요 (you’ll fall). In casual speech it shrinks to -다간.