What Are Particles and Why Korean Needs Them

Korean marks a word’s grammatical role by attaching a short particle directly after it, rather than relying purely on word order the way English does. That’s why the same noun can look slightly different depending on whether it’s the topic, the subject, or the object of a sentence — and why beginners so often ask “which one do I use here?”

는/은 — Marking the Topic

는/은 (neun-eun) marks what a sentence is about — “as for X.” Use 는 after a word ending in a vowel and 은 after one ending in a consonant. It sets up the topic, then lets the rest of the sentence say something about it.

이/가 — Marking the Subject

이/가 (i-ga) marks the grammatical subject — the thing actually doing the action or being described — and often carries a slightly more specific or emphatic nuance than 는/은. The two aren’t fully interchangeable, but for beginners, 이/가 is the safer default when introducing new information.

을/를 — Marking the Object

Once the topic and subject are sorted, 을/를 (eul-reul) marks the object — the thing receiving the action. Attach 을 after a consonant-ending word and 를 after a vowel-ending one.

Quick Practice Examples

Put together: “저는 밥을 먹어요” — “as for me (저는), I eat (먹어요) rice (밥을).” Swap 는 for 가 and the sentence shifts subtly toward emphasizing that it’s specifically you who’s eating, rather than simply introducing yourself as the topic.