은/는: Topic particle, "as for"

How 은/는 works in real sentences

The rule for picking the form is the easy part: 은 (eun) after a consonant, as in 학생은 haksaengeun, and 는 (neun) after a vowel, as in 저는 jeoneun. What takes longer is feeling why a Korean speaker reaches for it. Here's how I think about it.

It sets the stage

은/는 tells the listener what you're about to talk about. English does the same thing with "as for..." or "when it comes to...", just less often.

저는 미국 사람이에요. jeoneun miguk saramieyo

"As for me, I'm American."

Once the stage is set, you can drop it. If you've just said 저는, you don't need to repeat it in the next sentence, because the listener already knows you're still talking about yourself.

It quietly compares

This is the part textbooks rush past. When you mark something with 은/는, you often hint that it's different from something else.

김치는 맛있어요. gimchineun masisseoyo

"The kimchi is good." (the other dishes, maybe not so much)

Say 김치가 맛있어요 gimchiga masisseoyo and it's just a plain comment. Say 김치는 and you've singled the kimchi out.

You'll also see two of them in one sentence, setting two things side by side:

사과는 좋아하지만 포도는 싫어해요. sagwaneun joahajiman podoneun sireohaeyo

"Apples I like, but grapes I don't."

And it can sit on more than one word at once, each doing its own job: 저는 고기는 안 먹어요 jeoneun gogineun an meogeoyo, "I don't eat meat" (though I eat other things).

It states general facts

For things that are true in general, not just right now, use 은/는:

해는 서쪽에서 져요. haeneun seojjogeseo jyeoyo, "The sun sets in the west."

겨울은 추워요. gyeoureun chuwoyo, "Winter is cold."

It stacks on other particles

은/는 can go after another particle to make that part the topic or the contrast:

• 에 + 는 → 에는 eneun: 주말에는 쉬어요. jumareneun swieoyo, "On weekends, I rest."
• 에서 + 는 → 에서는 eseoneun: 학교에서는 휴대폰을 못 써요. hakgyoeseoneun hyudaeponeul mot sseoyo, "At school, you can't use your phone."
• 하고 + 는 → 하고는 hagoneun: 동생하고는 안 싸워요. dongsaenghagoneun an ssawoyo, "I don't fight with my younger sibling" (with others, maybe).

Short forms you'll hear

In speech, 는 often shrinks onto the word before it: 저는 → 전 jeon, 나는 → 난 nan, 너는 → 넌 neon. You'll hear 전 괜찮아요 jeon gwaenchanayo, "I'm fine", all the time.

저는 or 제가?

When you introduce yourself, use 저는 jeoneun. 제가 jega puts the spotlight on you as opposed to someone else, so 제가 했어요 jega haesseoyo means "I'm the one who did it." For the full picture of when 이/가 takes over, see 은/는 vs 이/가.

Stacking on other particles

은/는 doesn't only go on bare nouns. It can sit after place, time and person particles, and then it adds its usual "as for this one" feeling:

• 서울에는 친구가 많아요. seoureneun chinguga manayo "In Seoul, I have lots of friends." Maybe not elsewhere.
• 학교에서는 한국어로 말해요. hakgyoeseoneun hangugeoro malhaeyo "At school, I speak Korean."
• 동생한테는 말하지 마. dongsaenghanteneun malhaji ma "Don't tell my younger sibling, at least."

It never stacks on 이/가 i/ga or 을/를 eul/reul, though. It takes their place:

• ✗책을은 읽었어요. chaegeureun ilgeosseoyo
• ✓책은 읽었어요. chaegeun ilgeosseoyo "The book, I did read."

Short forms in speech

In casual talk, 는 shrinks to just ㄴ on a few very common words. You'll hear these all the time:

• 나는 naneun becomes 난 nan: 난 괜찮아. nan gwaenchana "I'm fine."
• 저는 jeoneun becomes 전 jeon: 전 커피 마실게요. jeon keopi masilgeyo "I'll have coffee."
• 이것은 igeoseun becomes 이건 igeon: 이건 뭐예요? igeon mwoyeyo "What's this?"

They mean exactly the same thing. The long forms just sound more careful.

On adverbs, to soften a "no"

Put 은/는 on an adverb in a negative sentence and it turns a flat "no" into "not really":

• 잘은 모르겠어요. jareun moreugesseoyo "I don't really know much about it."
• 많이는 못 먹어요. manineun mot meogeoyo "I can't eat a lot."

The idea is contrast again: "well, no, but a little, maybe". It's a polite way to hedge.