을/를: How the Korean Object Particle Works

Once you know 은/는 and 이/가, the next particle you meet everywhere is 을/를. It appears in almost every sentence that has an action done to something: eating rice, watching a drama, buying a ticket. It is also the particle learners drop most often in speech, because Koreans drop it too. Here is how it works, using the Standard Korean Dictionary and answers from the National Institute of Korean Language (NIKL).

1. What 을/를 marks

The Standard Korean Dictionary gives the same first definition for both forms: a case particle that marks the direct target of an action (동작이 미친 직접적 대상을 나타내는 격 조사). In English grammar terms, that is the direct object.

• 밥을 먹어요. [babeul meogeoyo] "(I) eat rice."
• 드라마를 봐요. [deuramareul bwayo] "(I) watch a drama."
• 표를 샀어요. [pyoreul sasseoyo] "(I) bought a ticket."

The particle attaches to the end of the noun with no space.

2. 을 or 를: it depends on the last sound

The choice between the two is purely about sound:

• Noun ends in a consonant (has batchim): use 을. 밥을, 책을 (book), 사진을 (photo).
• Noun ends in a vowel (no batchim): use 를. 드라마를, 커피를 (coffee), 표를.

NIKL's answers describe 를 as the form that attaches after nouns without a final consonant (받침 없는 체언). The pattern mirrors 은/는 and 이/가: the form with an extra vowel sound follows a consonant, which keeps the syllables easy to pronounce.

3. The spoken shortcut: 를 becomes ㄹ

In casual speech you will often hear 를 squeezed onto the noun as a single ㄹ. NIKL confirms this: after a noun without batchim, 를 can be replaced by ㄹ. Its example is 시계를 (the clock) shortened to 시곌. The same answer notes that 는 can shrink to ㄴ in the same way, as in 나는 to 난.

Two cautions from NIKL:

• This is a very colloquial way of writing, so use it in texts and chats, not in formal writing.
• NIKL describes this contraction for 를 after a noun without batchim. It does not describe a matching shortcut for 을.

Common contracted forms you will see in messages and lyrics:

• 나를 → 날 (me)
• 너를 → 널 (you)

4. When 을/를 is not marking an object

The dictionary lists a second use of 를: an emphasizing particle (보조사) that attaches after particles like 에 and 으로, after connective endings like -아, -게, -지, -고, and after some adverbs. NIKL quoted these dictionary examples:

• 시장에를 갔니? "Did you go to the market?" (에 + 를, stressing the destination)
• 흥분이 가라앉지를 않았다. "The excitement just would not settle." (-지 + 를)
• 내 말도 좀 들어를 보세요. "Do try listening to me." (-어 + 를)

You do not need to produce these as a beginner, but recognizing them stops you from searching for an object that is not there. When 를 follows another particle or a verb ending, it is usually adding emphasis.

5. Dropping 을/를 in speech

In everyday conversation, Koreans often leave the object particle out when the meaning is clear: 밥 먹었어요? "Did you eat (a meal)?" is completely natural. As a learner, it is fine to include the particle; it is never wrong in standard speech, and it helps you build sentences correctly. Once you are comfortable, you will notice where native speakers drop it.

6. Particles that look similar but mark something else

The dictionary lists several other meanings for 을/를. Besides the direct object, it also marks the place where a movement happens (산길을 걸었다, "walked along a mountain path"), the destination of a verb like 가다 (학교를 다니다, "to attend school"), and the starting point of an action (서울을 출발한, "departing from Seoul"). So a noun with 을/를 is not always the thing being acted on. Check the verb before translating the noun as an English object.

7. Practice

Add 을 or 를:

1. 커피___ 마셔요. (I drink coffee.)
2. 한국어___ 공부해요. (I study Korean.)
3. 김밥___ 샀어요. (I bought kimbap.)
4. 친구___ 기다려요. (I'm waiting for a friend.)

Answers: 1. 를 2. 를 3. 을 4. 를

8. Key takeaways

• 을/를 marks the direct target of an action, the direct object.
• Use 을 after a consonant (밥을) and 를 after a vowel (커피를).
• In very casual writing, 를 after a vowel can shrink to ㄹ: 시계를 → 시곌, 나를 → 날.
• After particles or verb endings (시장에를, 가라앉지를), 를 adds emphasis instead of marking an object.
• Dropping 을/를 is common in speech, but including it is always correct.