Korean Particles: 은/는, 이/가, 을/를

Particles attach to Korean nouns and show how those nouns function in a sentence or conversation. The three beginner pairs 은/는, 이/가, and 을/를 are worth learning early because they appear constantly in basic Korean.

If English is your first language, particles can feel unfamiliar because English relies more heavily on word order. Korean still has a default word order, but particles provide additional information about topic, subject, object, location, contrast, and other roles.

Free interactive grammar pages: 은/는 · 을/를 · existence 있어요 · particles tool.

Batchim rule for the three core pairs

These particles come in pairs whose spelling depends on whether the preceding syllable ends in a final consonant (batchim).

Examples:

• 책 (batchim ㄱ) → 책이 / 책은 / 책을
• 커피 (no batchim) → 커피가 / 커피는 / 커피를
• 물 (batchim ㄹ) → 물이 / 물은 / 물을

Make the spelling choice automatic first. Then you can focus on the harder question: what meaning the particle adds.

은/는: topic and contrast

Use 은 after a final consonant and 는 after a vowel. This pair often sets what you are talking about or contrasts it with another possibility.

What “topic” means in practice

은/는 is common when:

• the noun is already part of the conversation
• you are setting a frame such as “as for X…”
• you are contrasting one thing with another, explicitly or implicitly
• you are shifting to a new topic

Learn more about 은/는 with interactive examples →

이/가: subject and focus

Use 이 after a final consonant and 가 after a vowel. 이/가 marks the grammatical subject and is especially common when identifying, introducing, or focusing the thing that performs an action or has a property.

When 누구 takes the subject particle 가, it contracts to 누가. If someone asks 누가 학생이에요? (“Who is the student?”), an answer such as 제가 학생이에요 focuses the answer on me.

Existence verbs and 이/가 →

을/를: the direct object marker

Use 을 after a final consonant and 를 after a vowel. It marks a noun that receives the action of a transitive verb.

Many Korean sentences do not need a direct object. Existence patterns, copular sentences, and descriptive verbs work differently, so do not add 을/를 simply because an English sentence contains a noun after the verb.

Learn more about 을/를 →

은/는 vs 이/가: a practical comparison

There is no single English translation that tells you which pair to choose. These are useful beginner tendencies:

Example dialogue

A: 뭐가 맛있어요? — What is delicious?

B: 비빔밥이 맛있어요. — Bibimbap is delicious.

B: 비빔밥은 매워요. — As for bibimbap, it is spicy.

Real conversation is more flexible than a beginner rule table. Speakers may omit particles when context is clear, use 은/는 to create contrast, or choose 이/가 to focus a subject. Learn the common patterns first, then pay attention to how the choice changes the information structure.

Mini drills

Say both versions and ask what changes in the context:

1. 저는 민지예요. / 제가 민지예요.
2. 물이 있어요. / 물을 마셔요.
3. 친구는 한국 사람이에요. / 친구가 왔어요.
4. 이것을 주세요. / 이것은 뭐예요?

Common learner mistakes

1. Treating every English subject as 이/가. Korean topic and grammatical subject are related but different concepts.
2. Ignoring batchim. 책이 is correct; 책가 is not.
3. Adding 을/를 to non-object patterns. Check whether the Korean verb actually takes a direct object.
4. Dropping particles before you understand their role. Omission is common in conversation, but practising the full form helps you learn the structure.
5. Memorizing only a table. Compare short sentences where changing the particle changes the focus or contrast.

Next particles

Once 은/는, 이/가, and 을/를 feel familiar:

Tools: particle checker · grammar reference · conjugator.

Practice on Chamelingo

Chamelingo uses particles inside sentence and production exercises rather than treating them only as isolated labels. Pair the practice with the free grammar library, particle checker, and the focused comparison guides linked above.

• Explore grammar points →
• Location particles guide →
• Learn Korean free tools →