intermediate
Sets up background information, contrast, or a soft lead-in before the main point.
Usage
Verbs: Stem + 는데 (가는데, 먹는데).
Adjectives: Stem + (으)ㄴ데 (예쁜데, 좋은데).
Nouns: Noun + 인데 (학생인데).
Past tense: Always 았/었는데, for verbs and adjectives alike.
Example:
비가 오는데 우산이 없어요. (It's raining and I have no umbrella).
Nuance
This is the single most-used connector in spoken Korean, and it is not just "but".
Setup: 제가 어제 영화를 봤는데 정말 재미있었어요. (I saw a movie yesterday, and it was great).
Contrast: 형은 키가 큰데 저는 작아요. (My brother is tall, but I'm short).
Softening a request: 좀 바쁜데 도와주실래요? (I'm a bit busy — could you help?)
Ending a sentence on 는데 leaves it hanging on purpose, which sounds gentle or hesitant.
In Context
지금 밥을 먹는데 이따가 전화할게요.
I'm eating right now, so I'll call you later.
이 옷은 예쁜데 너무 비싸요.
These clothes are pretty, but too expensive.
어제 서울에 갔는데 사람이 많았어요.
I went to Seoul yesterday, and there were a lot of people.
(으)ㄴ데 / 는데: the most useful ending nobody teaches first
If you learn one connector beyond "and" and "but", make it this one. 는데 is everywhere in spoken Korean, and textbooks tend to file it under "but", which is the least interesting thing it does.
Attaching it
- Verbs: stem + 는데. 가는데 (ganeunde), 먹는데 (meongneunde)
- Adjectives: stem + (으)ㄴ데. 예쁜데 (yeppeunde), 좋은데 (joeunde)
- Nouns: noun + 인데. 학생인데 (haksaeng-inde)
- Past tense: always 았/었는데, for verbs and adjectives alike. 갔는데 (ganneunde), 좋았는데 (joatneunde)
The past-tense line is the one to hold onto: the verb-versus-adjective split disappears once you're in the past.
Job one: setting something up
This is the use that matters most and the one "but" completely fails to capture. 는데 hands the listener background before the real point arrives.
- 어제 영화를 봤는데 정말 재미있었어요. (eoje yeonghwa-reul bwanneunde jeongmal jaemiisseosseoyo) — "I saw a movie yesterday, and it was really good."
There's no contrast there at all. It's "here's the setup, now here's the thing".
Job two: contrast
- 형은 키가 큰데 저는 작아요. (hyeong-eun ki-ga keunde jeoneun jagayo) — "My brother is tall, but I'm short."
This is the textbook meaning, and it's maybe a third of the actual usage.
Job three: softening
Korean uses 는데 to take the edge off a request, the way English pads things with "I was wondering if".
- 좀 바쁜데 도와주실래요? (jom bappeunde dowajusillaeyo?) — "I'm a bit busy — could you help me?"
Job four: trailing off on purpose
You can end a sentence on 는데 and simply stop. It isn't an unfinished thought; it's a deliberate one.
- 시간이 없는데... (sigan-i eomneunde...) — "It's just that I don't have time..."
Leaving it hanging lets the listener draw the conclusion, which is softer than stating it. Refusals, complaints and hints all lean on this. Once you notice it you'll hear it constantly.
Why it's worth the trouble
는데 is doing pragmatic work, not just logical work. It manages how blunt you sound. That's why a sentence can be grammatically perfect and still land wrong without it, and why fluent-sounding speech is full of 는데 where a textbook would use a full stop.