Korean Grammar Made Easy: -고 있다 vs -아/어 있다

One of the most common hurdles for students is distinguishing between "-고 있다" and "-아/어 있다". While both can often be translated as "is doing" or "is in a state" in English, they describe very different aspects of an action. 

Today, let's break down these two forms to help you ace your TOPIK 1 exam and speak more naturally! 

1. Action in Progress: -고 있다 

Use "-고 있다" when an action is happening right now or is a continuous habit. It focuses on the "movement" or "activity" itself. 

• Function: Ongoing action (similar to the English "-ing" form). 

• Form: Verb Stem + -고 있다. 

• Usage: Best used with active verbs like 'eat', 'study', or 'watch'. 

[Examples] 

• 저는 지금 밥을 먹고 있어요. (I am eating a meal right now.) 

• 친구가 도서관에서 공부하고 있습니다. (My friend is studying in the library.) 

• 요즘 한국어를 배우고 있어요. (I am learning Korean these days.) 

2. The Resulting State: -아/어 있다 

Use "-아/어 있다" to describe a state that continues after an action has been completed. It focuses on the "result" or "position" left behind. 

• Function: A state or result that remains after an action is finished. 

• Form: Verb Stem + -아/어 있다 (Depends on the stem vowel). 

• Usage: Usually used with verbs of position or change of state like 'sit', 'stand', 'open', or 'hang'. 

[Examples] 

• 아이가 의자에 앉아 있어요. (The child is sitting on the chair. Focus: They sat down and are still in that seated state.) 

• 문이 열려 있어요. (The door is open. Focus: Someone opened it, and it remains open.) 

• 그림이 벽에 걸려 있어요. (A picture is hanging on the wall.) 

3. Comparison at a Glance 

To avoid confusion, look at how the meaning changes with the same verb: 

Context	-고 있다 (Action/Movement)	-아/어 있다 (Resulting State)
The Door	He is opening the door.  (In the middle of the act)	The door is open.  (It's already open)
Sitting	She is sitting down.  (Lowering her body)	She is seated.  (Already sitting on the chair)
Standing	The baby is standing up.  (The act of rising)	The baby is standing.  (Already on their feet)

4. Real-life Application (TOPIK 1 Style) 

In exams and daily life, you can distinguish them by looking at the context: 

• Progressive: "Minji is talking on the phone right now."

  (민지가 전화를 하고 있어요) 

• Result: "The classroom door is closed, so I can't enter."

  (교실 문이 닫혀 있어서 못 들어가요) 

• Description: "The person sitting over there is my brother."

  (저기 앉아 있는 사람이 제 형이에요) 

💡 Study Tip for Our Learners 

1. "What are you doing?"

   → When answering this question, you will almost always use -고 있다. 

2. Describing a Scene

   → When describing how a room looks or where someone is positioned, use -아/어 있다. 

   Example: The flowers are blooming (-고 있다) vs. The flowers are in bloom (-아/어 있다). 

Mastering these two will make your Korean sound much more sophisticated and accurate. If you have any questions, feel free to leave a comment! Happy studying!