은 vs 는 (eun vs neun): why it's 저는, not 저은

A particle is a small word ending that shows the role of a word in the sentence. Many learners write 저은 in a chat. Then a Korean friend kindly writes back 저는 (jeoneun) — "as for me". This is a very common mistake. Here is the rule that fixes it.

How do I choose 은 or 는?

Look at the last block of the word. Does it have a 받침 (batchim)? A 받침 is a consonant at the bottom of the block.

• Yes, it ends in a consonant → 은
• No, it ends in a vowel → 는

Why are there two forms? Only for the sound. 저은 puts two vowels together, which is hard to say. 저는 is smooth.

The meaning never changes, only the form. Other particles work the same way: 이/가, 을/를 and 과/와.

What does the topic marker do?

It says: "This is what we are talking about." Think of "as for…".

• 저는 학생이에요. [저는 학쌩이에요.] (Jeoneun haksaengieyo.) — As for me, I'm a student.
• 오늘은 바빠요. [오느른 바빠요.] (Oneureun bappayo.) — As for today, I'm busy.

Look at the second sentence. 오늘 (oneul) — "today" — is not the one who is busy. You are busy.

So 은/는 can make any word the topic. It is not only for the subject (the one who does the action).

은/는 sets the scene first. Then the rest of the sentence gives the information.

은/는 or 이/가?

The hard part is 은/는 vs 이/가 (i/ga). 이/가 is the subject marker. Here is a simple guide that works most of the time.

Be careful with contrast. 커피는 마셔요 (keopineun masyeoyo) means "Coffee, I drink." It has a hidden message: "…but not other drinks."

Here is how it sounds when two people meet:

• A: 저는 미나예요. 이름이 뭐예요? ("I'm Mina. What's your name?")
• B: 저는 알렉스예요. ("I'm Alex.")

Each person makes "me" the topic. B's 저는 also has a small "and as for me" feeling.

Easy mistakes

• 저은, 친구은 are wrong. These words end in a vowel, so use 저는, 친구는.
• 책는 is wrong. 책 ends in ㄱ, so use 책은.
• 누구는 왔어요? is wrong. For "who" questions, use 누가.
• 는 on every word. It is not wrong grammar. But it can sound like you are comparing things.

The last mistake is very common. "The weather is nice" is usually 날씨가 좋아요 (nalssiga joayo). If you say 날씨는 좋아요, it sounds like "The weather is nice…". Your friend may ask: "So what is not nice?"

Why is the topic so important in Korean?

In Korean, the topic usually comes first. People give the topic, then add the details. When the topic is clear, people often drop it in the next sentences.

So a topic alone can be a full question. With a friend, you can say 너는? (neoneun?) — "And you?" In polite talk, you can say 저는요? (jeoneunyo?) — "What about me?" The particle carries the whole meaning: "Now let's talk about this."

This also explains self-introductions. Koreans almost always start with 저는, because "me" is the new topic. Say 저는 once, then drop it until the topic changes. If you repeat it in every sentence, it sounds stiff, like a textbook.

Quick check

1. 학교___ 커요. (The school is big.) → 학교 ends in a vowel: 학교는
2. 이름___ 뭐예요? (What's your name?) → 이름 ends in ㅁ: 이름은
3. 누___ 했어요? (Who did it?) → question word: 누가

You can test yourself with one more question in today's challenge.