은/는 vs 이/가: The Korean Topic and Subject Markers Explained

Ask any Korean learner which grammar point confused them the longest, and many will say the difference between 은/는 (eun/neun) and 이/가 (i/ga). Both often translate as nothing at all in English, and both can appear after the "subject" of a sentence. Yet choosing one over the other changes the feeling of what you say. Here is a practical way to think about them.

First, the forms

Both markers have two shapes, chosen by whether the noun ends in a consonant or a vowel.

• 은 after a consonant, 는 after a vowel: 책은, 저는
• 이 after a consonant, 가 after a vowel: 책이, 친구가

은/는 sets the topic

Think of 은/는 as saying "as for X" or "speaking of X." It tells the listener what the sentence is about, and then the rest of the sentence comments on it. That is why self-introductions use 는.

• 저는 캐나다 사람이에요.

  [jeoneun kaenada saramieyo]

  I'm Canadian. (As for me, I'm a Canadian person.)

• 제 이름은 민지예요.

  [je ireumeun minjieyo]

  My name is Minji.

• 한국 음식은 맛있어요.

  [hanguk eumsigeun masisseoyo]

  Korean food is delicious. (general statement)

이/가 points to the subject

이/가 marks the grammatical subject, the one doing the action or being described, and it often introduces something new or answers "who" or "what."

• 비가 와요.

  [biga wayo]

  It's raining. (Rain is coming.)

• 누가 왔어요?

  [nuga wasseoyo]

  Who came?

• 민지가 왔어요.

  [minjiga wasseoyo]

  Minji came.

In the question "Who came?" the unknown is the person, so the answer uses 가 to spotlight new information. Replying 민지는 왔어요 would sound as if you were saying "Minji, at least, came," implying others did not.

Contrast: the hidden meaning of 은/는

Because 은/는 marks a topic, it naturally creates contrast when you compare two things.

• 커피는 좋아해요. 그런데 차는 안 좋아해요.

  [keopineun joahaeyo geureonde chaneun an joahaeyo]

  I like coffee. But tea, I don't like.

• 오늘은 바빠요.

  [oneureun bappayo]

  Today (unlike other days), I'm busy.

This contrast is so strong that adding 은/는 to a single word can hint at "but not the others." If someone asks whether you eat spicy food and you answer 김치는 먹어요, you are implying that kimchi is fine, but other spicy things may not be.

Question words take 이/가

Question words like 누구 (who), 뭐 (what), and 어디 (where) are always new information, so they pair with 이/가, never 은/는.

• 뭐가 제일 맛있어요?

  [mwoga jeil masisseoyo]

  What's the most delicious?

• 어디가 아파요?

  [eodiga apayo]

  Where does it hurt?

Note that 누구 + 가 becomes 누가.

Descriptions and "having"

Sentences with 있다 (to exist, to have), 없다 (to not exist, to not have), and descriptive verbs often use 이/가 for the thing that exists or is described, while the person who has it takes 은/는.

• 저는 동생이 있어요.

  [jeoneun dongsaengi isseoyo]

  I have a younger sibling.

• 저는 시간이 없어요.

  [jeoneun sigani eopseoyo]

  I don't have time.

• 이 가방이 예뻐요.

  [i gabangi yeppeoyo]

  This bag is pretty.

A quick decision guide

• Introducing yourself or setting the scene: 은/는.
• Comparing or contrasting: 은/는.
• Answering "who/what" or presenting new information: 이/가.
• With question words: 이/가.
• The thing you have, like, or feel about in 있다/없다 sentences: often 이/가.

This is a wall almost every learner hits, and it is a sign that you have moved beyond basic phrases. Keep collecting example sentences, and the difference will start to feel natural.