Korean Particles Explained: 은/는, 이/가, 을/를
Particles are the glue of Korean sentences. They attach to nouns and mark each noun’s role. Topic, subject, object, location, and more. Getting the big three right (은/는, 이/가, 을/를) is the single biggest step toward natural-sounding beginner Korean.
If English is your first language, particles feel alien because English mostly uses word order (“the cat chased the dog”) instead of sticky endings. Korean is freer with order; particles carry the job.
Free interactive grammar leaves: 은/는 · 을/를 · existence 있어요 · particles tool.
Batchim rule (one rule that unlocks all three)
Korean particles usually come in pairs: one form after a consonant (batchim), one after a vowel.
| After batchim (닫힌 음절) | After open syllable | Job |
|---|---|---|
| 은 | 는 | Topic |
| 이 | 가 | Subject |
| 을 | 를 | Object |
Examples:
- 책 (batchim ㄱ) → 책이 / 책은 / 책을
- 커피 (open) → 커피가 / 커피는 / 커피를
- 물 (batchim ㄹ) → 물이 / 물은 / 물을
Drill this until it is muscle memory. Then 은/는 vs 이/가 becomes a meaning choice, not a spelling panic.
은/는: the topic marker
Use 은 after a consonant and 는 after a vowel. The topic marker says: “as for this, here’s what I want to say.”
| Korean | English | Romanization |
|---|---|---|
| 저는 학생이에요 | As for me, I’m a student | jeo-neun hak-saeng-i-e-yo |
| 이것은 책이에요 | As for this, it’s a book | i-geo-seun chaek-i-e-yo |
| 한국은 아름다워요 | As for Korea, it’s beautiful | han-guk-eun a-reum-da-wo-yo |
What “topic” actually means
- Often known information (we already know we’re talking about me / this / Korea)
- Often contrast (“As for me (unlike them)…”)
- Can reappear when you shift what the sentence is about
Learn more about 은/는 with interactive examples →
이/가: the subject marker
Use 이 after a consonant and 가 after a vowel. The subject marker often introduces new or focused information. Who/what is actually doing something or existing.
| Korean | English | Romanization |
|---|---|---|
| 책이 있어요 | There is a book | chaek-i i-sseo-yo |
| 커피가 맛있어요 | The coffee is delicious | keo-pi-ga ma-si-sseo-yo |
| 누구가 왔어요? | Who came? | nu-gu-ga wa-sseo-yo |
When someone asks “Who is a student?”, you often answer with 이/가: 저가 학생이에요 (it’s me who is the student).
을/를: the object marker
Use 을 after a consonant and 를 after a vowel. The object marker marks what the action hits.
| Korean | English | Romanization |
|---|---|---|
| 밥을 먹어요 | I eat rice | bab-eul meo-geo-yo |
| 커피를 마셔요 | I drink coffee | keo-pi-reul ma-syeo-yo |
| 한국을 배워요 | I learn Korea / Korean (context) | han-guk-eul bae-wo-yo |
No object? Many sentences simply don’t use 을/를 (existence, adjectives, “I am X”).
은/는 vs 이/가: the comparison everyone wants
This is one of the most asked questions in Korean learning. Practical rules of thumb:
| Use | When |
|---|---|
| 은/는 | Noun is already “on the table,” contrast, scene-setting “as for…” |
| 이/가 | New info, answers who/what, focus, many 있어요/없어요 patterns |
Example dialogue
A: 뭐가 맛있어요? (What is delicious?). Asking for new info → 가
B: 비빔밥이 맛있어요. (Bibimbap is delicious.). Answering with focus → 이
B: 비빔밥은 매워요. (As for bibimbap, it’s spicy.). Adding info about known topic → 은
You will see natives “break” textbook rules in real speech. Your job as a beginner is not to litigate Reddit threads. It is to produce simple correct patterns until they feel automatic.
English-first deep dive: English prepositions vs Korean particles.
Mini drills (say them out loud)
- 저는 민지예요. / 저가 민지예요. (When would each fit?)
- 물이 있어요. / 물을 마셔요.
- 친구는 한국 사람이에요. / 친구가 왔어요.
- 이것을 주세요. / 이것은 뭐예요?
Check batchim each time before you choose 은/이/을 vs 는/가/를.
Common learner mistakes
- Translating “subject” = always 이/가: English “subject” ≠ Korean topic
- Ignoring batchim. 책이 vs 책가 (wrong)
- Double-marking without intent. Advanced topic+subject stacks exist, but beginners should keep one clear role per noun
- Dropping particles too early. Natives drop; you should not until automatic
- Memorizing only tables without speaking. Particles stick through production
Next particles (after the big three)
Once 은/는 · 이/가 · 을/를 feel stable:
| Particle | Job | Start here |
|---|---|---|
| 에 / 에서 | Location / place of action | 에 vs 에서 mistakes |
| 하고 / 와 / 과 | And / with | Conversation practice |
| 도 | Also / too | “저도요” |
| 만 | Only | “물만 주세요” |
Tools: particles practice · honorifics · conjugator.
Practice on Chamelingo
Chamelingo covers particle types across early units of the structured beginner curriculum. Interactive exercises where you choose the right particle in context, not only in tables. Pair that with free reference pages on the grammar encyclopedia and the vocabulary dictionary.