Korean Particles Made Simple: 은/는, 이/가, 을/를

Korean doesn't rely on word order the way English does — it relies on particles, small markers attached to nouns that tell you each word's role in the sentence. Learn the core particles and Korean grammar suddenly clicks into place; ignore them and even simple sentences stay murky. This guide covers the ones you'll use constantly: the topic markers 은/는, the subject markers 이/가 (and the famous confusion between them), the object markers 을/를, and a few high-value extras — 에, 에서, and 도.

First, the consonant/vowel rule

Most of these particles come in pairs, and which one you use depends only on whether the noun ends in a consonant or a vowel — it's about pronunciation, not meaning. After a consonant, use 은 / 이 / 을. After a vowel, use 는 / 가 / 를.

• 책은 / 책이 / 책을chaegeun / chaegi / chaegeul

  the book (topic / subject / object)

  책 ends in a consonant → 은 / 이 / 을.

• 사과는 / 사과가 / 사과를sagwaneun / sagwaga / sagwareul

  the apple (topic / subject / object)

  사과 ends in a vowel → 는 / 가 / 를.

Topic 은/는 vs subject 이/가 — the classic confusion

This is the single most asked-about point in Korean grammar, and it's subtle because both often attach to what English would call the subject. The difference is what they emphasize. 은/는 marks the topic — "as for this, ..." — and is used for general statements, contrasts, and information already known. 이/가 marks the grammatical subject and tends to introduce new, specific, or emphasized information.

• 저는 학생이에요jeoneun haksaengieyo

  I'm a student (as for me...)

  는 sets 'me' as the topic — a general statement about myself.

• 누가 왔어요? — 친구가 왔어요nuga wasseoyo? — chinguga wasseoyo

  Who came? — A friend came

  가 marks the new subject that answers the question.

• 커피는 좋아하는데 차는 안 좋아해요keopineun joahaneunde chaneun an joahaeyo

  I like coffee, but I don't like tea

  는 here draws a contrast between coffee and tea.

A useful rule of thumb: when answering "who/what" (introducing new info), 이/가 fits; when commenting on something already in view or contrasting two things, 은/는 fits. You'll develop the feel with exposure — even advanced learners rely partly on instinct here.

Object 을/를

을/를 marks the direct object — the thing the action is done to. Use 을 after a consonant and 를 after a vowel. It answers "what?" after a verb.

• 물을 마셔요mureul masyeoyo

  I drink water

  물 (consonant) + 을 marks 'water' as the object of 'drink'.

• 영화를 봐요yeonghwareul bwayo

  I watch a movie

  영화 (vowel) + 를 marks 'movie' as the object of 'watch'.

Location and time: 에 and 에서

These two are easy to mix up. 에 (e) marks a static location, a point in time, or a destination. 에서 (eseo) marks the place where an action happens (or a starting point, 'from'). The test: if something is happening at the place, use 에서; if you're just stating where something is or going to, use 에.

• 학교에 가요hakgyoe gayo

  I go to school (destination)

  에 marks the destination of movement.

• 학교에서 공부해요hakgyoeseo gongbuhaeyo

  I study at school (action location)

  에서 marks where the action takes place.

• 세 시에 만나요se sie mannayo

  Let's meet at three o'clock

  에 also marks a point in time.

The handy 도 ('also/too')

도 (do) means "also" or "too" and replaces 은/는 or 이/가 (you don't stack them). It's high-value because it shows up constantly.

• 저도 학생이에요jeodo haksaengieyo

  I'm a student too

  도 replaces 는 here — not 저는도.

• 커피도 주세요keopido juseyo

  Coffee too, please

How to actually master particles

Particles are learned through reps, not memorization — you internalize 은/는 vs 이/가 by seeing them in hundreds of real sentences until the right one simply feels correct. A structured path helps you meet them in the right order and build on each one. Our Korean courses sequence particles into a clear grammar progression with practice, and if you prefer a self-directed route, our guide to self-studying Korean shows how to fold grammar drills into an efficient daily plan.