Grammar

Korean Particles Explained: The Essential Guide to 은/는, 이/가, 을/를

7 min read·February 13, 2026

Particles are the glue that holds Korean sentences together. Unlike English, which relies on word order to show meaning, Korean uses small words called particles (조사, josa) attached to nouns to indicate their role in a sentence. Getting particles right is one of the biggest challenges — and biggest breakthroughs — for Korean learners.

What Are Korean Particles?

Particles are short suffixes attached directly to nouns (no space between). They tell you whether a noun is the topic, subject, object, location, direction, or something else entirely. Korean has dozens of particles, but mastering just 6-8 core ones will cover about 90% of what you need.

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Key rule: particles change form based on whether the preceding noun ends in a consonant (받침) or a vowel. This is called consonant/vowel harmony and it makes Korean flow more naturally when spoken.

은/는 — Topic Markers

The topic markers 은 (after consonant) and 는 (after vowel) mark what the sentence is about. Think of it as "as for..." or "speaking of...". The topic is the general subject of conversation, providing context for what follows.

저는 학생입니다.

jeoneun haksaengimnida

As for me, I am a student.

💡저 ends in vowel → 는

한국은 아름다워요.

hangugeun areumdawoyo

As for Korea, it is beautiful.

💡한국 ends in consonant ㄱ → 은

날씨는 좋아요.

nalssineun joayo

As for the weather, it is nice.

💡Setting the topic of conversation

When to use 은/는: introducing a new topic, contrasting two things, or making general statements. "Coffee는 좋아요, but tea는 별로예요" — here 는 creates contrast.

이/가 — Subject Markers

The subject markers 이 (after consonant) and 가 (after vowel) mark the grammatical subject — who or what performs the action. While topic and subject sound similar in English, Korean distinguishes them clearly.

비가 와요.

biga wayo

Rain is coming. (It's raining.)

💡비 ends in vowel → 가

사람이 많아요.

sarami manayo

There are many people.

💡사람 ends in consonant ㅁ → 이

누가 했어요?

nuga haesseoyo

Who did it?

💡누구 + 가 → 누가 (contraction)

은/는 vs 이/가: The Big Difference

This is the #1 question Korean learners ask. The key difference: 은/는 marks known/old information (the topic), while 이/가 marks new/important information (the subject). Compare these:

저는 의사예요.

jeoneun uisayeyo

I am a doctor. (telling about myself)

💡은/는: "I" is the established topic

제가 의사예요.

jega uisayeyo

I am the doctor. (identifying myself)

💡이/가: emphasizing that it's ME

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Simple rule of thumb: Use 은/는 when answering "Tell me about X" and 이/가 when answering "Who/What did Y?" For example: "Who came?" → "민수가 왔어요" (Minsu came). "What about Minsu?" → "민수는 학생이에요" (Minsu is a student).

을/를 — Object Markers

The object markers 을 (after consonant) and 를 (after vowel) mark the direct object — the thing being acted upon. Since Korean uses SOV word order, the object comes before the verb.

커피를 마셔요.

keopireul masyeoyo

I drink coffee.

💡커피 ends in vowel → 를

밥을 먹어요.

babeul meogeoyo

I eat rice/food.

💡밥 ends in consonant ㅂ → 을

한국어를 공부해요.

hangugeoreul gongbuhaeyo

I study Korean.

💡Object + 를 + Verb

에 — Location/Time Marker

The particle 에 marks location ("at/in/to") or time ("at/on/in"). It does not change form — it is always 에 regardless of what comes before it.

학교에 가요.

hakgyoe gayo

I go to school.

💡Direction/destination

집에 있어요.

jibe isseoyo

I am at home.

💡Location

세 시에 만나요.

se sie mannayo

Let's meet at 3 o'clock.

💡Time

에서 — Action Location Marker

While 에 marks where something exists or where you're going, 에서 marks where an action takes place. Think of 에서 as "at (doing something)" or "from".

카페에서 공부해요.

kapeeseo gongbuhaeyo

I study at a café.

💡Action happening at location

한국에서 왔어요.

hangugeso wasseoyo

I came from Korea.

💡Origin/source

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에 vs 에서: Use 에 with existence verbs (있다/없다) and movement verbs (가다/오다). Use 에서 with action verbs (먹다, 공부하다, 일하다). "학교에 있어요" (I'm at school) vs "학교에서 공부해요" (I study at school).

도 — "Also/Too"

The particle 도 means "also" or "too". It replaces 은/는, 이/가, or 을/를 — it does not stack on top of them.

저도 학생이에요.

jeodo haksaengieyo

I am also a student.

💡저는 → 저도 (replaces 는)

커피도 좋아해요.

keopi-do joahaeyo

I like coffee too.

💡커피를 → 커피도 (replaces 를)

의 — Possessive Marker ("'s / of")

The particle 의 (pronounced "에" in casual speech) shows possession, like the English apostrophe-s. However, Korean often drops 의 when the relationship is obvious.

한국의 수도

hangugui sudo

the capital of Korea

저의 이름

jeoui ireum

my name

💡Often shortened to 제 이름

친구의 집

chinguui jip

friend's house

Quick Reference: All Core Particles

Particle	After Consonant	After Vowel	Function	Example
Topic	은	는	"As for..."	저는 (as for me)
Subject	이	가	Who/what does	비가 (rain does)
Object	을	를	What is acted on	밥을 (rice is eaten)
Location/Time	에	에	At/in/to/on	학교에 (to school)
Action Place	에서	에서	At (doing)	카페에서 (at café)
Also	도	도	Too/also	저도 (me too)
Possessive	의	의	Of / 's	한국의 (Korea's)

Common Particle Mistakes

Using 은/는 in questions about identity — "누가 했어요?" (Who did it?) uses 가, not 는.
Stacking 도 with other particles — "저는도" is wrong. 도 replaces the particle: "저도".
Confusing 에 and 에서 — "카페에 공부해요" is wrong. Actions at a place need 에서: "카페에서 공부해요".
Using 을/를 with 좋아하다 and 싫어하다 — These are correct! "커피를 좋아해요" is right, even though English says "I like coffee" (no marker).
Dropping particles too early — In casual speech, Koreans often drop particles. But as a learner, practice using them to build correct habits first.

Practice Strategy

The best way to master particles is through practice with real sentences. Start by identifying particles in Korean text — circle every 은, 는, 이, 가, 을, 를 you see. Then practice building your own sentences using the pattern: [Topic]은/는 [Subject]이/가 [Object]을/를 [Verb]. Even simple sentences like "저는 커피를 마셔요" (I drink coffee) use three particles correctly.