고 있다 vs 아/어 있다: Action in Progress vs Resulting State

Core examples: 문을 열고 있다; 문이 열려 있다; 앉고 있다; 앉아 있다; 불을 켜고 있다; 불이 켜져 있다.

Doing now or being in the result?

English “is” can hide a major Korean distinction. Korean often separates an action in progress from a state that remains after an action.

문을 열고 있어요. Someone is opening the door.

문이 열려 있어요. The door is open.

The first focuses on an ongoing action. The second focuses on the resulting state. The verb, particle, and subject often change.

As a learner contrast, 고 있다 usually watches the action or an ongoing engagement, while 아/어 있다 usually looks at the state left behind. The contrast is powerful, but it is not a license to ignore verb-specific patterns such as wearing, holding, posture, and long-term activity.

고 있다: action in progress

-고 있다 often marks an ongoing action:

• 밥을 먹고 있어요.
• 책을 읽고 있어요.
• 문을 열고 있어요.
• 전화를 하고 있어요.
• 회의하고 있어요.

The subject is usually actively doing something. If there is an object, 을/를 often appears:

직원이 문을 열고 있어요.

The employee is in the process of opening the door.

아/어 있다: resulting state

-아/어 있다 often describes a state that exists after a completed action, especially with intransitive or passive-like verbs:

• 문이 열려 있어요.
• 불이 켜져 있어요.
• 사람이 앉아 있어요.
• 책이 놓여 있어요.
• 창문이 닫혀 있어요.

The focus is not on someone doing the action now. It is on what state is visible now.

Subject and particle reveal the difference

In the action sentence, an actor does something. In the state sentence, the door, light, child, or book is in a state.

Posture and wearing verbs need care

Some verbs complicate the simple rule. 앉아 있다 means “is sitting/seated.” 서 있다, 누워 있다, 걸려 있다, 놓여 있다 are common state descriptions.

Wearing verbs are especially important:

• 옷을 입고 있어요 = is wearing clothes
• 신발을 신고 있어요 = is wearing shoes
• 모자를 쓰고 있어요 = is wearing a hat

These use -고 있다 but often describe a maintained state after putting something on, not an active process of putting it on. Context decides whether the person is putting on the item or wearing it.

고 있다 can show long-term ongoing activity

• 한국어를 배우고 있어요.
• 회사에서 일하고 있어요.
• 서울에 살고 있어요.

These do not necessarily mean the person is doing the action at this exact second. They describe ongoing engagement or current life situation.

A state/action check

Ask:

1. Is someone actively doing the verb right now?
2. Is the visible result more important than the action?
3. Is the subject an actor or the affected thing?
4. Is the verb transitive, intransitive, passive-like, posture-related, or wearing-related?
5. Is the sentence a photo caption, status report, or live action description?
6. Would English use “is doing,” “is open,” “is sitting,” “is wearing,” or “has been done”?

Technical-review guardrail: 고 있다 has more than one high-frequency reading

The action/state contrast is the learner’s main tool, but it is simplified. -고 있다 can mark ongoing action, long-term activity, maintained wearing/holding states, and in some descriptions a continuing result depending on the verb. -아/어 있다 strongly covers completed-change states such as 열려 있다 and 닫혀 있다. The article now presents the contrast as a decision routine, not an absolute rule.

Mini practice: action or state?

Suggested functions:

1. Image prompt: user chooses a scene.
2. Actor/state toggle: focus on person acting or visible result.
3. Sentence builder: 고 있다 vs 아/어 있다.
4. Verb warning: flags posture and wearing verbs.
5. Particle contrast: 을/를 action vs 이/가 state.
6. Translation panel: natural English equivalents.

Final rule

Do not translate both 고 있다 and 아/어 있다 as “is.” Ask whether Korean is showing an action unfolding, an ongoing life activity, a posture/wearing state, or a result that remains visible.