Object Particle 을/를 in Korean

In Brief

Korean marks the person or thing directly affected by an action with 을 or 를: 밥을 먹어요 means “I eat rice/a meal.” Use 을 after a consonant sound and 를 after a vowel sound. The particle is attached directly to the noun, although it is often omitted when the meaning is obvious in casual speech.

Overview

A particle is a short grammatical marker attached to a word. 을/를 marks the direct object—in plain terms, the person or thing that an action is done to. In 영화를 봐요 (“I watch a movie”), the movie is what gets watched, so 영화 takes the object particle 를.

This is one of the basic patterns introduced at A1. Korean usually places the verb at the end of a clause, so a common order is subject–object–verb. English says “I drink coffee,” but Korean can say 저는 커피를 마셔요, with the order “as for me—coffee—drink.” Korean subjects are frequently left unstated when the context makes them clear, which is why 커피를 마셔요 can naturally mean “I drink coffee,” “she drinks coffee,” or “they drink coffee,” depending on the conversation.

English mainly uses word order to show which noun is the object. Korean uses markers such as 을/를, so the noun’s role is more visible. For a dependable beginner sentence, put 을/를 after the object and the action verb last.

How It Works

The basic choice: final consonant or final vowel

The two forms have the same grammatical job. The final sound of the noun determines which one you use.

End of the noun	Particle	Pattern	Example
Consonant (a final 받침, or bottom consonant)	을	noun + 을	밥 + 을 → 밥을
Vowel (no final 받침)	를	noun + 를	커피 + 를 → 커피를

Look at the last Hangul syllable, not the English spelling or the meaning of the word:

• 책 ends in ㄱ, so it becomes 책을 (“a book” as object).
• 물 ends in ㄹ, so it becomes 물을 (“water” as object).
• 영화 ends in ㅏ, so it becomes 영화를 (“a movie” as object).
• 한국어 ends in ㅓ, so it becomes 한국어를 (“Korean” as object).

The particle is written without a space: 책을, not 책 을. A space normally comes after the complete noun phrase: 그 책을 읽어요 (“I read that book”). Here 을 attaches to the final word 책, not to 그.

Find the object by asking what the verb acts on

A practical test is to identify the action and ask “what?” or “whom?”

• 무엇을 먹어요? “What do you eat?” → 밥을 먹어요.
• 무엇을 봐요? “What do you watch?” → 영화를 봐요.
• 누구를 만나요? “Whom do you meet?” → 친구를 만나요.

This test works especially well with clear action verbs such as 먹다 (to eat), 마시다 (to drink), 읽다 (to read), 보다 (to see/watch), 사다 (to buy), 배우다 (to learn), and 만나다 (to meet).

Build the sentence around the final verb

A full sentence may contain a topic or subject before the object:

저는 + 한국어를 + 배워요.
“As for me + Korean (object) + learn.”
“I learn Korean.”

The topic 저는 tells us who the sentence is about. 한국어를 identifies what is learned. 배워요 supplies the action and comes last. Because Korean often drops information that listeners can recover, 한국어를 배워요 is also complete in a suitable context.

A noun phrase can include demonstratives, possessors, numbers, and adjectives. Attach 을/를 only after the whole object phrase:

• 이 책을 읽어요. — I read this book.
• 한국 영화를 봐요. — I watch a Korean movie.
• 사과 두 개를 사요. — I buy two apples.
• 제가 만든 음식을 먹어요. — I eat the food I made.

Questions use the same marker

The question word that stands for the object can take 을/를 too:

• 뭐를 먹어요? — What are you eating?
• 무엇을 공부해요? — What do you study?
• 누구를 기다려요? — Whom are you waiting for?

무엇을 is the fuller form. 뭐를 is common in conversation, and 뭘 is its frequent contraction. The choice does not change the role: all three can mark “what” as the object.

Examples in Context

Korean	English	Note
밥을 먹어요.	I eat rice/a meal.	밥 ends in a consonant, so use 을.
영화를 봐요.	I watch a movie.	영화 ends in a vowel, so use 를.
커피를 마셔요.	I drink coffee.	The subject is understood from context.
한국어를 배워요.	I learn Korean.	The language is the thing learned.
아침에 신문을 읽어요.	I read the newspaper in the morning.	신문 ends in ㄴ.
시장에서 과일을 사요.	I buy fruit at the market.	The location comes before the object and verb.
주말에 친구를 만나요.	I meet a friend on the weekend.	Korean 만나다 takes the person met as an object.
음악을 자주 들어요.	I often listen to music.	듣다 treats what is heard as its object.
문을 닫아 주세요.	Please close the door.	The request still marks 문 as the object.
이 사진을 좋아해요.	I like this photo.	좋아하다 commonly takes 을/를.
사과 두 개를 샀어요.	I bought two apples.	를 follows the complete quantity phrase 두 개.
오늘 뭐를 만들어요?	What are you making today?	뭐를 is conversational.
누구를 기다려요?	Whom are you waiting for?	누구 is the person affected by 기다리다.
저는 매운 음식을 잘 못 먹어요.	I cannot eat spicy food well.	을 follows the entire phrase 매운 음식.

Common Mistakes

Choosing the form from the first syllable

• Wrong: 책를 읽어요.
• Right: 책을 읽어요.
• Why: Only the noun’s final sound matters. 책 ends with the consonant ㄱ, so it takes 을.

Putting a space before the particle

• Wrong: 커피 를 마셔요.
• Right: 커피를 마셔요.
• Why: Korean case particles attach directly to the noun they mark.

Keeping English word order

• Wrong: 저는 마셔요 커피를. (unmarked beginner sentence)
• Right: 저는 커피를 마셔요.
• Why: The normal neutral order places the object before the verb. Korean can rearrange elements for a special discourse effect, but the verb-final pattern is the right default.

Marking the person who acts as the object

• Wrong: 저를 책을 읽어요. when you mean “I read a book.”
• Right: 저는 책을 읽어요. or 제가 책을 읽어요.
• Why: The reader is the topic or subject, not the object. 을/를 belongs on 책, the thing being read.

Copying an English preposition instead of learning the Korean verb pattern

• Wrong: avoiding 을/를 in 친구를 만나요 because English says “meet a friend” differently from “wait for a friend.”
• Right: 친구를 만나요. / 친구를 기다려요.
• Why: Grammatical roles do not map word for word across languages. Learn a Korean verb together with the marker its partner normally takes.

Dropping 을/를 before the sentence is clear

• Less clear in isolation: 저는 책 읽어요.
• Safer beginner form: 저는 책을 읽어요.
• Why: Particle omission can be natural in speech, but using 을/를 makes the structure explicit and helps prevent ambiguity while you are learning.

Usage Notes

Omission in conversation

In relaxed speech, speakers often omit 을/를 when the object is obvious, short, and close to the verb:

• 커피 마셔요? — Are you drinking coffee? / Do you drink coffee?
• 점심 먹었어요? — Did you eat lunch?
• 이거 알아요? — Do you know this?

These are not incomplete in ordinary conversation. Context and the verb make the relationship clear. Omission is less attractive when it could obscure the structure, when the object is long or unexpected, or when the speaker wants to emphasize exactly what is affected. Formal writing also tends to preserve particles more consistently than casual speech.

For beginners, omission is best treated as something to recognize before using freely. Keeping 을/를 is grammatical in both speech and writing; it may simply sound more explicit in contexts where native speakers would naturally leave it out.

English “like” and Korean 좋아하다

English learners sometimes expect feelings to use a subject-style construction. With 좋아하다 (“to like”), Korean normally marks the liked thing with 을/를:

• 저는 고양이를 좋아해요. — I like cats.

Do not confuse this with 좋다 (“to be good; to be pleasing”), which often appears with 이/가:

• 저는 고양이가 좋아요. — I like cats / Cats appeal to me.

Both can express preference, but their grammar is different. At A1, memorizing N을/를 좋아하다 as one useful pattern is enough.

Pronunciation and contractions

In natural speech, the particle is pronounced as part of the preceding word, not as a separate beat created by a written space. A few high-frequency combinations contract, especially 무엇을 → 뭘. You may also hear colloquial forms such as 이걸, 그걸, and 저걸, from 이것을, 그것을, and 저것을. The contraction still contains the object-marking function.

Beyond the Basics / Advanced Use

You do not need to produce all of the following at A1, but these patterns explain why later Korean does not always match the simple “object = 을/를” rule on the surface.

Topic and focus markers can take its place

When an object is contrasted or made the topic, 은/는 may appear where plain 을/를 would otherwise stand:

• 책을 읽었어요. — I read a/the book. (neutral object)
• 책은 읽었어요. — I did read the book / As for the book, I read it. (often implying contrast)

Similarly, particles such as 도 (“also/even”) can mark an object’s added meaning without 을/를:

• 책도 읽었어요. — I read the book too / I also read a book.

It is therefore more accurate to say that 을/를 is the neutral object marker, not that every object must visibly carry it. Do not automatically stack all particles together; learn common replacements such as 책은 and 책도 as complete patterns.

을/를 can mark an extent, route, or duration

Not every advanced 을/를 phrase looks like a textbook object that is “acted on.” Korean also uses the marker with certain measures and paths:

• 두 시간을 공부했어요. — I studied for two hours.
• 공원을 걸었어요. — I walked through/in the park.
• 하루를 쉬었어요. — I took a day off.

Linguists analyze these uses in more detail, but learners can initially remember that some verbs license 을/를 for the duration or route covered by an action. The verb and established Korean pattern matter more than an English word-for-word test.

하다 verbs may appear with or without a separate object phrase

Many activity words combine with 하다:

• 공부해요. — I study.
• 한국어를 공부해요. — I study Korean.
• 한국어 공부를 해요. — I do Korean-language study.

The compact 공부하다 behaves as one verb. In 공부를 하다, 공부 is separately marked as the thing done. Both structures occur, and the choice can depend on rhythm, emphasis, and what modifies the activity. Beginners do not need to force 를 inside every 하다 verb.

Voice can change the marking

In an active sentence, the affected noun is commonly an object:

• 민수가 문을 열었어요. — Minsu opened the door.

In a corresponding intransitive or passive-like description, the door is presented as the subject and takes 이/가:

• 문이 열렸어요. — The door opened / The door was opened.

This is a later reminder that particles describe a noun’s role in the Korean sentence, not its permanent identity. The same noun can take different particles in different constructions.

Practice Tips

1. Run a final-sound drill. Take ten everyday nouns and say the object form aloud: 책→책을, 물→물을, 영화→영화를, 커피→커피를. Make the 을/를 choice automatic before building full sentences.
2. Learn nouns with an action. Pair 음식 with 먹다, 음악 with 듣다, and 책 with 읽다, then produce complete chunks such as 음식을 먹어요. This teaches the particle and Korean verb pattern together.
3. Listen in two passes. First notice clear 을/를 endings in careful speech. On a second pass, identify places where a speaker omits the particle but the object remains understandable. Keep the particle in your own practice until omission feels predictable.

Related Concepts

• Prerequisite: Basic Sentence Structure — reviews Korean verb-final order and the basic roles inside a sentence.