Korean particles are small markers attached to nouns that define the grammatical role of that word in a sentence.

Understanding the difference between the topic particles (은/는) and subject particles (이/가) takes a bit of practice.

These tiny words don’t have direct translations in English.

However, learning their specific functions will instantly make your spoken and written Korean sound more natural.

I’ll break down exactly how and when to use each of these particles below.

How to attach particles to words

The particle you choose depends entirely on the last letter of the noun it attaches to.

You must look at whether the noun ends in a consonant or a vowel.

In Korean, a final consonant is called a batchim (받침).

Words that end with a batchim use one set of particles to make pronunciation flow smoother.

Words that end in a vowel use the other set.

Here’s an easy reference table for attaching these particles:

The topic particle: 은/는 (eun/neun)

The particles 은 and 는 are used to indicate the main topic of your sentence.

You can think of these particles as meaning “As for…” or “When it comes to…” in English.

They tell the listener what the general focus of the conversation is going to be about.

저는 학생이에요.

jeo-neun haksaeng-ieyo.

As for me, I'm a student.

Another major function of the topic particle is to show contrast or comparison.

If you want to emphasize that something is different from something else, you use 은/는.

사과는 싸지만, 수박은 비싸요.

sagwa-neun ssajiman, subag-eun bissayo.

Apples are cheap, but watermelons are expensive.

You also use the topic particle when stating general facts or universal truths.

치타는 빨라요.

chita-neun ppallayo.

Cheetahs are fast.

The subject particle: 이/가 (i/ga)

The particles 이 and 가 are used to identify the specific subject that is doing the action.

While the topic particle focuses on the overall theme, the subject particle shines a spotlight on the “who” or “what”.

If someone asks “Who did this?”, you answer using a subject particle because you’re identifying a specific person.

누가 케이크를 샀어요?

nuga keikeu-reul sasseoyo?

Who bought the cake?

민수가 샀어요.

minsu-ga sasseoyo.

Min-su bought it.

Note that when the pronoun 저 (I/me) meets the particle 가, it changes form entirely to 제가 (jega).

Likewise, the informal pronoun 나 (I/me) changes to 내가 (naega) when paired with 가.

The subject particle is also used when you’re introducing new information to a conversation.

Once that new information has been established, you can switch to the topic particle for the rest of the story.

남자가 걸어가요.

namja-ga georeogayo.

A man is walking. (New info)

Lastly, 이/가 is heavily used to describe specific observations happening right now.

비가 와요.

bi-ga wayo.

It's raining.

Key differences and examples

Sometimes, both particles can be used in the exact same sentence.

However, swapping the particle completely changes the nuance of what you’re trying to say.

Let’s look at a simple sentence about a dog to see how the meaning shifts.

개는 귀여워요.

gae-neun gwiyeowoyo.

The dog is cute. (General statement or introducing the topic)

Using 는 tells the listener, “As for dogs, they’re generally cute.”

It could also mean, “The cat might be ugly, but the dog is cute” depending on the context of the conversation.

Now, let’s swap it to the subject particle.

개가 귀여워요.

gae-ga gwiyeowoyo.

The dog is cute. (Specific observation or emphasis on this exact dog)

Using 가 tells the listener, “Look at that specific dog right there, it’s cute!”

It also answers the implicit question, “Which animal is cute?”

Remember to use 은/는 for big picture topics and contrasts.

Always stick to 이/가 for specific subjects, new information, and direct actions.

Best resources to practice Korean grammar

Reading about particles is a great start, but actively practicing them is how you’ll reach fluency.

I highly recommend testing your knowledge with interactive exercises and structured courses.

Here are the best platforms to practice your Korean grammar skills:

• Talk In Korean: This is our very own platform and the absolute best place to master Korean grammar from day one. We offer detailed lessons, native audio, and structured quizzes designed specifically for conversational fluency.
• How To Study Korean: This website provides incredibly deep, textbook-style explanations of Korean grammar for learners who enjoy intensive reading.
• King Sejong Institute: Funded by the Korean government, this site offers standard academic courses and free learning materials.
• Duolingo: While it won’t teach you deep grammar rules, this app is useful for daily vocabulary repetition and building a basic study habit.