-고 있다 vs -아 있다: Progressive vs Resultant

English hands you one "-ing" form and asks it to do two very different jobs: the door is closing (an action moving through time) and the door is closed (a result just sitting there). Korean refuses to let those blur together. -고 있다 is the progressive — an action caught in mid-motion — while -아/어 있다 is the resultant state — a completed action whose result is still standing. Picking the wrong one doesn't sound slightly off; it says something you didn't mean.

The core split

Ask one question: is the action still moving, or is it finished and only its result remains?

• Still moving → -고 있다 (지금 옷을 입고 있어요 = I'm putting my clothes on right now).
• Finished, result stands → -아/어 있다 (문이 열려 있어요 = the door is [in the state of being] open).

The cleanest way to feel the difference is a verb of posture, where both are possible:

You'd rarely narrate the two-second act of lowering yourself, so 앉고 있어요 is uncommon in the wild — but that is exactly why the pair is such a clean diagnostic. 앉고 있다 is the descent; 앉아 있다 is the position you hold afterward. Nine times out of ten, "I'm sitting" means the second one.

-고 있다: the action in progress

Attach -고 있다 to a verb stem to say the action is unfolding at the reference time — the direct equivalent of the English progressive. It works with any verb, transitive or intransitive, because it describes motion, not a result.

That last one is the trap to remember: 문을 닫고 있어요 describes a person actively swinging the door shut, right now. It is not how you say "the door is closed." Hold that thought.

-아/어 있다: the result that stays

Attach -아/어 있다 to say an action is over and its result is still in effect. The action itself is done; what you're reporting is the state it left behind. The vowel follows harmony — -아 있다 after a stem vowel ㅏ/ㅗ, -어 있다 everywhere else — exactly like the past tense and other aspect forms.

Notice that none of these describe anyone doing anything. The picture isn't being hung; it hangs. The light isn't being switched; it's on. -아/어 있다 photographs the aftermath.

Why -아/어 있다 refuses transitive verbs

Here is the rule that trips everyone up: -아/어 있다 attaches only to intransitive verbs (and passives). A transitive verb — one that takes a 을/를 object — cannot form a resultant state this way. The reason is logical once you see it: a resultant state has no ongoing agent, so there's no room for an object being acted on. "The door in the state of being closed" has no closer and no thing-being-closed; it's just a door, closed.

This is why "the door is closed" cannot be built on the transitive 닫다 ("to close [something]"). You have to switch to its passive partner 닫히다 ("to be/get closed"), which is intransitive, and then add -어 있다:

Compare the transitive-active version one more time, side by side in meaning:

Same door, two universes: 닫고 있다 is a person mid-push; 닫혀 있다 is the shut door afterward. The switch from active 닫다 to passive 닫히다 is what unlocks the resultant reading.

The verbs that naturally take -아/어 있다 are therefore intransitives of change-of-state or motion — go, stand, sit, die, be born, arrive, be left, wilt:

Common Mistakes

There is really only one root error here, and it comes straight from English: because English uses be + -ing (the door is closing) and be + adjective/participle (the door is closed, he is seated) as if they were the same "state-of-being" machinery, English speakers reach for -고 있다 — the first Korean progressive they learned, drilled as "the -ing form" — to cover both. So they build a progressive where Korean demands a resultant state. Retrain the reflex: if you're describing how something ended up, not what's happening, you want -아/어 있다 — and if the verb is transitive, swap it for its passive first.

1. Using -고 있다 for the state "is closed / is open / is on."

2. Using -고 있다 for a held posture.

3. Forcing -아/어 있다 onto a transitive verb. A verb that keeps its 을/를 object can never take -아/어 있다.

4. Confusing "is dying" with "is dead."

Key Takeaways

• -고 있다 = action in progress (a video). Works on any verb. 밥을 먹고 있어요, 문을 닫고 있어요.
• -아/어 있다 = the standing result of a finished action (a photograph). 문이 닫혀 있어요, 앉아 있어요.
• -아/어 있다 only attaches to intransitive verbs and passives. To say "the door is closed," switch the transitive 닫다 to the passive 닫히다 first, then add -어 있다.
• Vowel harmony: -아 있다 after ㅏ/ㅗ (앉아, 살아), -어 있다 elsewhere (서, 죽어, 열려).
• The English reflex to fight: be + -ing and be + closed/seated look identical in English but split in Korean. Describing a result, not an action → reach for -아/어 있다.