This is the single most important page in the adjectives group. When a word modifies a following noun in the present tense, Korean makes it choose an ending based on what kind of word it is — and the two choices are different. A descriptive verb (what English calls an adjective) takes -(으)ㄴ: 예쁜 꽃 ("a pretty flower"). An action verb takes -는: 먹는 사람 ("a person who is eating"). Pick the wrong one and you get ×좋는 사람 or a sentence that means something you didn't intend. Master this contrast and you've mastered the practical heart of the Korean verb/adjective divide.
The core split
Line them up and the pattern is stark. Same slot — right before a noun, present tense — but a different ending depending on the class of the modifier:
| Word class | Present attributive ending | Example |
|---|---|---|
| Descriptive verb (adjective) | -(으)ㄴ | 예쁜 꽃 (a pretty flower) |
| Action verb | -는 | 먹는 사람 (a person eating) |
저기 라면 먹는 사람 보여요?
jeogi ramyeon meongneun saram boyeoyo
Do you see the person eating ramen over there?
시청 가는 버스가 몇 번이에요?
sicheong ganeun beoseuga myeot beonieyo
Which number is the bus going to City Hall?
지금 읽는 책 재미있어요?
jigeum ingneun chaek jaemiisseoyo
Is the book you're reading right now interesting?
Those three modifiers — 먹는, 가는, 읽는 — are all action verbs (eat, go, read), so they take -는. Now compare adjectives, which take -(으)ㄴ:
이렇게 예쁜 꽃은 처음 봐요.
ireoke yeppeun kkocheun cheoeum bwayo
I've never seen such a pretty flower.
좋은 사람 같아요.
joeun saram gatayo
He seems like a good person.
Minimal pairs: isolate the class difference
The cleanest way to feel the contrast is to hold the noun constant and swap only the modifier's class:
- 작은 아이 — "a small child" (작다 is a descriptive verb → -(으)ㄴ)
- 자는 아이 — "a sleeping child" (자다 is an action verb → -는)
자는 아이를 깨우지 마세요.
janeun aireul kkaeuji maseyo
Don't wake a sleeping child.
작은 아이가 혼자 울고 있었어요.
jageun aiga honja ulgo isseosseoyo
A small child was crying all alone.
Another pair, this time with faces:
- 예쁜 사람 — "a pretty person" (adjective → -(으)ㄴ)
- 웃는 사람 — "a person who is laughing/smiling" (verb → -는)
웃는 얼굴이 참 예뻐요.
unneun eolguri cham yeppeoyo
A smiling face is really lovely.
And the sharpest pair of all, because the two words share a root — 좋다 ("is good," a descriptive verb) vs. 좋아하다 ("to like," an action verb):
- 좋은 사람 — "a good person" (좋다 → -(으)ㄴ)
- 좋아하는 사람 — "a person (someone) likes" (좋아하다 → -는)
제가 좋아하는 사람이 생겼어요.
jega joahaneun sarami saenggyeosseoyo
There's now someone I like.
That pair alone shows why the class matters: 좋은 and 좋아하는 look and sound related, but 좋다 is a state and 좋아하다 is an action, so they take opposite endings.
WHY the endings differ: -(으)ㄴ is already taken by the past
This isn't an arbitrary pairing to memorize — there's a clean logic underneath, and seeing it makes the rule stick. For an action verb, the ending -(으)ㄴ marks the PAST:
- 먹다 → 먹은 음식 = "the food that was eaten / that (someone) ate" (past)
- 먹다 → 먹는 음식 = "the food (someone) is eating" (present)
어제 먹은 음식이 좀 이상했어요.
eoje meogeun eumsigi jom isanghaesseoyo
The food I ate yesterday was a bit off.
Because a verb's -(으)ㄴ slot is occupied by past meaning, a verb cannot use -(으)ㄴ for the present — the language needs a separate present-verb ending, and that's -는. Adjectives, meanwhile, don't use -는 at all, which leaves the -(으)ㄴ slot free for them to mark the present state. So the whole system falls out of one fact:
| Modifier | -(으)ㄴ | -는 |
|---|---|---|
| Action verb (먹다) | 먹은 (past) | 먹는 (present) |
| Descriptive verb / adjective (작다) | 작은 (present) | — (not used) |
This is the deepest payoff of understanding that Korean adjectives are descriptive verbs: both classes are "verbs," but they split their attributive labor differently, and that split is exactly what the verb/adjective divide predicts.
The decision test
When you're about to put a modifier in front of a noun, ask one question: is this word describing what the noun is LIKE, or what it is DOING?
- What it's like (a state — big, pretty, quiet, good) → descriptive verb → -(으)ㄴ: 큰 집, 예쁜 꽃, 조용한 곳, 좋은 사람.
- What it's doing (an ongoing action — eating, going, reading, sleeping) → action verb → -는: 먹는 사람, 가는 버스, 읽는 책, 자는 아이.
If you can slot the base word into "The X is _" as a quality (the flower is pretty), it's an adjective and takes -(으)ㄴ. If it names an activity in progress (the person is eating), it's a verb and takes -는.
One systematic exception (next page)
There is a famous wrinkle: a small family of adjectives built on the existence verbs 있다/없다 — 재미있다, 맛있다, 맛없다, 멋있다 — takes the verb-style -는 despite meaning a state: 재미있는 영화, never ×재미있은 영화. They inherit -는 from the 있다/없다 sitting at their core. That exception is worth its own page: -있다/-없다 adjectives take -는. Everywhere else, the state → -(으)ㄴ / action → -는 rule holds.
Common Mistakes
1. Putting -는 on an adjective. A descriptive verb takes -(으)ㄴ. ×좋는, ×예쁘는, ×크는 are all wrong.
❌ 좋는 사람 만나고 싶어요.
Wrong — 좋다 is an adjective; it takes -(으)ㄴ: 좋은 사람.
✅ 좋은 사람 만나고 싶어요.
joeun saram mannago sipeoyo
I want to meet a good person.
2. Using a verb's -(으)ㄴ and expecting present meaning. 먹은 사람 does not mean "a person who is eating" — it means "the person who ate." For the ongoing action, use -는.
❌ 지금 밥 먹은 사람이 누구예요?
Wrong for 'currently eating' — 먹은 is past ('who ate').
✅ 지금 밥 먹는 사람이 누구예요?
jigeum bap meongneun sarami nuguyeyo
Who's the person eating right now?
3. Applying one flat "modifier + noun" rule to everything. English uses bare adjacency for both ("a good person," a "sleeping child"); Korean forces you to sort by class first — adjective → -(으)ㄴ, action verb → -는.
❌ 자은 아이를 깨우지 마세요.
Wrong — 자다 is an action verb; 'sleeping' is 자는, not 자은.
✅ 자는 아이를 깨우지 마세요.
janeun aireul kkaeuji maseyo
Don't wake a sleeping child.
4. Putting -는 on a 하다-adjective by analogy with 하다-verbs. 조용하다 is a descriptive verb → 조용한 곳; only the action verb 공부하다 gives 공부하는.
❌ 조용하는 카페를 찾고 있어요.
Wrong — 조용하다 is an adjective: 조용한 카페.
✅ 조용한 카페를 찾고 있어요.
joyonghan kapereul chatgo isseoyo
I'm looking for a quiet café.
Key Takeaways
- Present-tense modifier before a noun: adjective → -(으)ㄴ (예쁜 꽃), action verb → -는 (먹는 사람). Never ×좋는 사람.
- The reason: for verbs, -(으)ㄴ already marks PAST (먹은 = "that was eaten"), so present action needs -는; adjectives don't use -는, so they keep -(으)ㄴ for the present.
- Decision test: describing what the noun is like (a state) → -(으)ㄴ; what it's doing (an ongoing action) → -는.
- This contrast is the descriptive-verb vs action-verb divide made visible.
- Exception: 있다/없다-adjectives (재미있는, 맛없는) take -는 — handled on the next page.
Now practice Korean
Reading grammar gets you part of the way. The exercises are where it sticks — free, no signup needed.
Start learning Korean→Related Topics
- Adjective Attributive -(으)ㄴ: 좋은, 예쁜, 큰TOPIK 1 — How a Korean adjective dresses to modify a noun — attach the present attributive -(으)ㄴ (-은 after a batchim, -ㄴ after a vowel): 좋은 사람, 큰 집. The modifier goes BEFORE the noun with no 'who/that', and the everyday error is leaving the adjective in its 좋다/좋아요 form.
- -있다/-없다 Adjectives Take -는: 재미있는, 맛없는TOPIK 2 — The systematic exception to the adjective rule: any adjective built on 있다 or 없다 (재미있다, 맛있다, 맛없다, 멋있다) takes the verb-style attributive -는 — 재미있는 영화, never ×재미있은 — because the 있다/없다 at its core patterns as a verb, and that morphology overrides the state meaning.
- The Verb / Adjective Divide & Why It MattersTOPIK 1 — Adjectives and verbs look identical in the dictionary, but they split in four grammatical places — attributives, commands, plain endings, and meaning — so you must always know which class a word belongs to.
- Korean Adjectives Are Verbs (형용사 = Descriptive Verbs)TOPIK 1 — The one reframing that unlocks the whole group: a Korean 형용사 is a descriptive (stative) verb that conjugates like an action verb and predicates on its own — 좋다 already means 'to be good', so 날씨가 좋다 is a complete sentence with no copula and no separate 'to be'.