Korean Particles 이/가 vs 은/는: What Nobody Explains Clearly
The most common particle confusion for Korean learners — and the one practical rule that makes it finally click.
For Korean learners at beginner to intermediate level
If you've studied Korean for more than a week, you've already hit this wall.
Someone says 나는 in one sentence, then 내가 in the next — and both mean "I." Your textbook labels them "topic marker" and "subject marker" and moves on. Not helpful.
Here's what's actually going on.
The Short Answer
은/는 marks what you're talking about (the topic). 이/가 marks who or what does the action (the subject — often new information).
That's the rule. The nuance is in how you apply it.
The Practical Rule
Use 은/는 when:
- You're introducing or switching a topic
- You're making a general statement
- You're implying contrast
저는 학생이에요. — I'm a student. (Topic: me)
Use 이/가 when:
- You're identifying who does something (new info)
- You're answering "who?" or "what?"
- You want to emphasize the subject
누가 했어요? 제가 했어요. — Who did it? I did.
Side by Side
나는 커피를 좋아해요. — I like coffee. (Topic: me)
커피가 맛있어요. — The coffee is delicious. (Subject: the coffee is the one being delicious)
The coffee is not a topic being discussed — it's the thing being something. That's 이/가 territory.
Why This Matters for Writing
When you write a Korean diary, particle errors are the most common mistakes — subtle enough that you won't catch them yourself.
You might write 저는 갔어요 when 제가 갔어요 sounds more natural. Both are understandable, but one sounds like a native speaker and one doesn't.
That gap — between "understandable Korean" and "natural Korean" — is exactly what structured correction closes. Not just flagging errors, but explaining why one choice sounds better.
Write a Korean diary entry today and find out which particles you're getting wrong. Try Korean Diary AI →