When 을/를 Is Dropped | Korean Grammar

Of all the Korean particles, 을/를 is the one that goes missing most often in real speech. Ask a Korean friend if they've eaten and they'll say 밥 먹었어?, not 밥을 먹었어? — the object particle is simply not there, and adding it would sound oddly heavy. This is not a shortcut or a corner-cut; it is how casual Korean actually sounds. The skill worth building is not "always attach 을/를" but knowing the handful of situations where you must keep it.

The default: drop it when the object hugs the verb

The core condition is simple. When the direct object sits right next to its verb and there is no ambiguity about what's being done to what, native speakers drop 을/를. The verb's transitivity plus the adjacency already recover the object's role, so the particle is redundant.

밥 먹었어?

bap meogeosseo

Did you eat? (밥[을] — dropped)

커피 마실래?

keopi masillae

Wanna get coffee? (커피[를] — dropped)

숙제 했어?

sukje haesseo

Did you do your homework? (숙제[를] — dropped)

나 물 좀 마실게.

na mul jom masilge

Let me grab some water. (물[을] — dropped)

In each of these, the object and verb are neighbors — 밥 먹다, 커피 마시다, 숙제 하다, 물 마시다 — and the pairing is so natural that the particle carries no information. Dropping it is the unmarked, ordinary choice in conversation.

💡

The default in casual speech is to drop 을/를 when the object touches the verb and the meaning is obvious. Keeping it is the marked choice — it does a specific job (contrast, emphasis, distance, or formality). If you can't name why you kept it, you probably didn't need it.

Keep it #1: to contrast or emphasize the object

When you want to spotlight the object or set it against something else, the particle comes back — and often the contrastive 은/는 steps in for exactly that job. This is a beautiful subtlety: dropping 을/를 is neutral, but swapping in 은/는 flips the object into a contrast.

밥은 먹었어.

babeun meogeosseo

I did eat (the rice, at least). (은 marks contrast — implies something else went undone)

청소는 했는데 설거지는 안 했어.

cheongsoneun haenneunde seolgeojineun an haesseo

I did the cleaning, but I didn't do the dishes. (두 objects contrasted with 는)

Say 밥 먹었어 and it's a flat yes; say 밥은 먹었어 and you've smuggled in an implication — "I ate, even if I didn't finish everything / didn't do the other thing." That contrast is precisely what dropping the particle would erase.

💡

Three states, three meanings: 밥을 먹었어 (neutral, slightly formal), 밥 먹었어 (neutral casual, particle dropped), 밥은 먹었어 (contrastive — "the rice, at least"). Dropping is not the same as swapping in 은/는. If you mean a plain casual "yes," drop it; if you mean "this one but not that one," reach for 은/는.

Keep it #2: when the object is separated from its verb

The moment the object stops touching its verb — because time words, adverbs, or other phrases have wedged in between — the safety net of adjacency is gone, and 을/를 (or 은/는) earns its place by keeping the roles clear.

그 영화를 지난 주말에 동생하고 같이 봤어요.

geu yeonghwareul jinan jumare dongsaenghago gachi bwasseoyo

I watched that movie last weekend with my younger sibling. (object far from the verb → keep 를)

Here 그 영화 ("that movie") is separated from its verb 봤어요 by four other words. Drop the 를 and the sentence turns mushy — the listener has to hold "that movie" in the air for a long time before learning what happened to it. The particle anchors it.

Keep it #3: in formal speech and writing

Dropping is a casual-register behavior. In formal 합니다체, reports, emails, and public notices, the object particle is expected, and omitting it reads as careless or unfinished.

서류를 제출하셨습니까?

seoryureul jechulhasyeotseumnikka

Have you submitted the documents? (formal — 를 kept)

보고서를 내일까지 작성하겠습니다.

bogoseoreul naeilkkaji jakseonghagetseumnida

I will write up the report by tomorrow. (formal — 를 kept)

The reframing: English can't do this at all

English never drops its object. "Did you eat?" can leave the object unspoken ("eat" used intransitively), but the moment you name the thing, you cannot strip its grammar — "×I ate rice" cannot become anything more compressed; the noun just sits there in the object slot. Korean is different because the particle is what marks objecthood, and a particle can be omitted when it's predictable. So "did you eat (the rice)?" collapses all the way to 밥 먹었어? — the object noun is present, but its grammatical marker has evaporated. English drops the whole object or nothing; Korean can keep the object and drop just its marker.

Common Mistakes

1. Mechanically inserting 를 into every casual sentence. It is not wrong grammatically, but it sounds stiff, textbook-ish, and slightly foreign in relaxed conversation.

❌ 너 밥을 먹었어?

Overly stiff for casual speech — natural Korean drops 을 here.

✅ 너 밥 먹었어?

neo bap meogeosseo

Did you eat? (natural casual register)

2. Dropping 를 in formal writing. The opposite error — formal register expects the particle.

❌ 보고서 작성했습니다.

Too casual for a report — formal register wants 보고서를.

✅ 보고서를 작성했습니다.

bogoseoreul jakseonghaetseumnida

I have written up the report. (formal)

3. Dropping the particle when the object is far from its verb. Distance removes the adjacency that made dropping safe.

❌ 그 책 어제 지하철에서 읽었어.

Ambiguous/mushy — with 그 책 stranded from 읽었어, keep 그 책을.

✅ 그 책을 어제 지하철에서 읽었어.

geu chaegeul eoje jihacheoreseo ilgeosseo

I read that book on the subway yesterday.

4. Dropping the particle when you actually mean contrast. If you intend "I did this one (but not that one)," you need 은/는 — dropping it loses the whole point.

❌ 밥 먹었어.

Loses the intended contrast ('I ate the rice, but skipped the soup') — a bare drop reads as a flat yes.

✅ 밥은 먹었어.

babeun meogeosseo

I did eat the rice (at least). (은 carries the contrast)

Key Takeaways

을/를 is the most freely dropped particle: omit it when the object hugs its verb and the meaning is clear (밥 먹었어?).
Keep it to (1) contrast or emphasize — often via 은/는 — (2) when the object is separated from its verb, or (3) in formal register.
Dropping is neutral; swapping in 은/는 adds contrast (밥은 먹었어 = "I did eat the rice, at least").
English drops the whole object or nothing; Korean keeps the object and drops only its marker.
Mechanically inserting 를 everywhere sounds stiff — it is a marked choice, not the default.

Now practice Korean

Reading grammar gets you part of the way. The exercises are where it sticks — free, no signup needed.

Start learning Korean→