고 있다 vs 아/어 있다: What's the Difference?

English says 'is sitting' for both. Korean splits the action from what it leaves behind.

In English, 'He is sitting on the chair' is one sentence with one meaning. In Korean it splits in two, and picking the wrong half changes what you are describing.

앉고 있어요 means he is in the middle of lowering himself onto the chair. 앉아 있어요 means he sat down earlier and is still there. One is the action; the other is the state the action left behind.

Quick Summary

고 있다 = the action is happening right now. 아/어 있다 = the action finished and its result continues.

Particle	Core Meaning	Used With	Example
고 있다	Action in progress	Any verb, including verbs with objects	밥을 먹고 있어요 I am eating (right now)
아/어 있다	Resulting state continues	Intransitive verbs only (no object)	문이 열려 있어요 The door is open

고 있다

When to Use 고 있다

1. Something Happening Right Now

Attach 고 있다 to any verb stem to say the action is underway at this moment. This is the direct equivalent of the English present continuous.

지금 책을 읽고 있어요.

I am reading a book right now.

2. Verbs That Take an Object

If the verb needs an object — 먹다, 읽다, 보다, 쓰다, 만들다 — then 고 있다 is your only option. 아/어 있다 cannot attach to these verbs at all.

편지를 쓰고 있어요.

I am writing a letter.

3. Ongoing Habits and Situations

고 있다 also covers stretches of time longer than this moment — a job you currently hold, a city you currently live in, a course you are partway through.

서울에서 일하고 있어요.

I am working in Seoul (these days).

아/어 있다

When to Use 아/어 있다

Use 아/어 있다 when the action is already over but the result is still true. It only works with intransitive verbs — ones that take no object — because you are describing the subject's own condition, not something being done to a thing. The most common ones are 앉다, 서다, 눕다, 살다, 남다, and the passive pairs 열리다, 닫히다, 켜지다, 꺼지다.

창문이 닫혀 있어요.

The window is closed.

친구가 밖에 서 있어요.

My friend is standing outside.

아직 자리가 남아 있어요.

There are still seats left.

Core Concept

고 있다

In Progress

"Lowering onto the chair"

아/어 있다

Resulting State

"Already seated"

Common Mistakes

책을 읽어 있어요 (X)

책을 읽고 있어요 (O)

"읽다 takes an object (책을), so it is transitive. Transitive verbs can never take 아/어 있다."

문이 열고 있어요 (X)

문이 열려 있어요 (O)

"The door is not opening itself. Use the passive stem 열리다 plus 아/어 있다 to describe the door's state."

의자에 앉고 있어요 (when you mean 'I'm seated')

의자에 앉아 있어요 (O)

"앉고 있어요 describes the two seconds while you lower yourself down. If you are already sitting, use 앉아 있어요."

한국에 살고 있어요 / 한국에 살아 있어요

Both exist, but mean different things

"살고 있어요 means 'I am living in Korea'. 살아 있어요 means 'I am alive'. This is the one pair where both forms are correct and the meanings are completely different."

옷을 입어 있어요 (X)

옷을 입고 있어요 (O)

"입다 takes an object, so only 고 있다 works. Korean uses 입고 있다 for both 'putting on' and 'wearing' — context tells them apart."

How to Choose in 5 Seconds

Follow these 5-second rules.

Does the verb have an object (을/를)?

Use고 있다

Is the action still happening right now?

Use고 있다

Is the action over but the result still true?

Use아/어 있다

Are you describing a position or an open/closed state?

Use아/어 있다

Frequently Asked Questions

Is there a quick test for which one to use?

Yes. Look for an object marked with 을/를. If the sentence has one, you must use 고 있다. 아/어 있다 only ever attaches to intransitive verbs.

Why is 앉아 있다 so common but 앉고 있다 so rare?

Because sitting down takes about a second. There is almost never a reason to describe that instant, whereas 'being seated' is a state you might describe for an hour. The same is true of 서다 and 눕다.

Can I use 아/어 있다 with 하다 verbs?

Generally no. 하다 verbs are transitive, so they take 고 있다. The exceptions are a handful of passive forms like 되어 있다 (있다 is attached to 되다, not 하다): 준비되어 있어요 means 'it is ready'.

What about 아/어 놓다 and 아/어 두다?

Those describe someone deliberately leaving something in a state — 문을 열어 놓았어요 (I left the door open, on purpose). 아/어 있다 just reports the state without saying who caused it.