Korean Indefinite Pronouns 누군가 아무: Meaning, Rules and Examples

Korean indefinite pronouns such as 누군가 (someone), 무언가 (something) and 어딘가 (somewhere) turn question words into "some-" words, while 아무 words pair with negatives. Learn the two families together, and the English words "someone", "anyone" and "no one" all have a clear Korean partner.

Key facts

• Level: B1. This is an editorial estimate based on common textbook order, not an official list.

What you'll learn

• Build "some-" words from question words with -ㄴ가.
• Choose between 아무도, 아무것도 and 아무나 by checking the verb.
• Use the right particle, since 도 replaces 이/가 and 을/를.
• Tell a real question from a "someone" question by stress and intonation.

Before you start, it helps to know the question words in the lessons on 뭐 무엇 what in Korean, 누구 누가 who in Korean and 어디 where in Korean, plus the basic 안 negation. Estimated time: 25 minutes.

What Do the Korean Indefinite Pronouns 누군가 아무 Mean?

Korean indefinite pronouns are words that point to a person, thing, place or time without saying which one. English has "someone", "something", "anywhere" and "nobody". Korean builds the same ideas from question words and from the word 아무.

Two families do most of the work.

• The "some-" family turns a question word into an unknown but real thing: 누군가 (someone), 무언가 (something), 어딘가 (somewhere), 언젠가 (sometime).
• The 아무 family says that the choice does not matter or that nothing exists: 아무나 (anyone at all), 아무거나 (anything at all), 아무도 (no one) and 아무것도 (nothing).

A First Look: Two Annotated Examples

Example 1. 누군가 문을 두드려요. (nugunga muneul dudeuryeoyo.) means "Someone is knocking at the door." The parts are 누군가 (someone), 문을 (the door, with the object particle), and 두드려요 (is knocking). Say 문을 as [무늘].

Example 2. 아무도 없어요. (amudo eopseoyo.) means "There is nobody." The parts are 아무도 (no one) and 없어요 (there isn't). Say it as [아무도 업써요]. Here the verb is negative in meaning, and that is what 아무도 needs.

The first sentence says that a person exists but is unknown. The second says that no person exists. The next section lays out how each word is built.

How Do the Korean Indefinite Pronouns 누군가 아무 Work?

The two families work in two different ways. The "some-" words add -ㄴ가 to a question word. The 아무 words put 아무 in front of a particle or a noun. The table shows the full set.

Three rules sit under the table.

1. Add -ㄴ가 for "some-". The ending is the shortened form of -인가, so 누구인가 became 누군가, 무엇인가 became 무언가, and 어디인가 became 어딘가. In speech, 무언가 is often shortened further to 뭔가.
2. Put 도 after 아무 for "no-". 아무도, 아무것도 and 아무에게도 all need a negative verb or a verb that is negative in meaning, such as 없다 (not exist) or 모르다 (not know).
3. Use 나 or 든지 for "any-". 아무나, 아무거나, 누구나 and 뭐든지 take positive verbs and mean "it doesn't matter which".

The "some-" words take particles like any noun. 누군가가 and 누군가 are both correct as subjects, and the shorter one is more common in speech. The 도 words do not take 이/가 or 을/를, because 도 replaces them. Other particles come before 도, as in 아무에게도 (to no one).

Here are four more examples with the pattern in use.

The sentences mean "Something is strange", "I left my wallet somewhere", "Someday I want to go to Korea" and "I did not eat anything". Say 지갑을 as [지가블], 가고 싶어요 as [가고 시퍼요] and 아무것도 as [아무걷또]. The next section builds one sentence step by step.

Worked Example, Step by Step

Building a sentence with an indefinite pronoun takes four steps, and each has a check.

Imagine you hear a sound at the door and want to say "Someone is knocking at the door."

1. Start with the question word. The person is unknown, so start from 누구 (who). Check: could the English be "who is it?" If yes, the question word is the base.
2. Add -ㄴ가. 누구 plus -ㄴ가 gives 누군가 (someone). Check: you know the person exists, so the "some-" word fits and 아무 does not.
3. Add the object and the verb. The door is the object, so 문을. The verb 두드리다 (to knock) in the polite present is 두드려요.
4. Put the pieces in order. Korean verbs come last: 누군가 문을 두드려요.

You'll know it worked when you can swap 누군가 for 아무도 and explain why the sentence breaks: 아무도 문을 두드려요 is wrong, because 아무도 needs a negative, so the correct pair is 아무도 문을 안 두드려요 ("No one is knocking at the door").

How Is 누군가 Different from 아무나 and 아무도?

The three words differ in what they say about the person. 누군가 says that a person exists but is unknown. 아무나 says that the choice does not matter. 아무도 says that no person exists. The table makes the contrast visible.

Two of these look alike. 누구나 할 수 있어요 means "Anyone can do it" in a neutral way, and it praises how open something is. 아무나 sometimes sounds critical when it describes people, as in 아무나 들어올 수 있는 곳이 아니에요, "It's not a place just anybody can enter". Say 들어올 수 as [드러올쑤].

For things, 아무거나 is the casual "anything will do" in a request, as in 아무거나 주세요 ("Anything is fine, please give me"). It does not sound critical when you order food. The formal form is 아무것이나, but in daily speech 아무거나 is the usual one.

When Do You Use Them, and When Not?

You use the "some-" words when the thing exists but you cannot name it, and the 아무 words when the choice does not matter or nothing exists. There are two edge cases that learners should know about.

Edge case 1: the question word may be a real question or may mean "someone". The words 누구, 뭐 and 어디 can mean "who", "what" and "where", or "someone", "something" and "somewhere", depending on stress and intonation. A real wh-question puts the prominence on the question word and often ends with a fall or a rise-fall. A sharp rise at the end turns the question word into "something". For example:

• 뭐 먹었어요? with the stress on 뭐 means "What did you eat?"
• 뭐 먹었어요? with a sharp final rise means "Did you eat something?"
• 어디 가요? with a sharp final rise means "Are you going somewhere?"

The spelling is the same in both. The clip plays the neutral wh-question. In writing, a reader decides from context. When you want to be sure in speech, add 뭔가 or 어딘가 explicitly: 뭔가 먹었어요? ("Did you eat something?").

Edge case 2: 아무 plus a noun. 아무 can sit before a noun, and the whole phrase still needs 도 and a negative. 아무 말도 안 했어요 (amu maldo an haesseoyo) means "He said nothing" or "I said nothing". Write 아무 and the noun with a space.

The second sentence, 아무에게도 말하지 않았어요, means "I told no one". The particle 에게 (to) comes before 도 and stays. A limit of this lesson: it covers the common forms. Spoken Korean also has words like 아무 데나 and 아무 때나, and their spacing is covered in the full negation lesson, 아무도 아무것도 전혀 negative words.

What Mistakes Do Learners Make?

Learners make four mistakes with these words, and each has a one-line fix.

1. A positive verb after 아무도 or 아무것도. Learners often write 아무도 왔어요 for "no one came". Actually this is ungrammatical, because 아무도 needs a negative. Write 아무도 안 왔어요.
2. A particle after 도. Learners often write 아무도가 or 아무것도를. Actually 도 replaces 이/가 and 을/를, so the word stands alone: 아무도 안 왔어요, 아무것도 안 먹었어요.
3. 누군가 for "no one". Learners often write 누군가 안 왔어요 to mean "nobody came". Actually it means "Someone didn't come". Use 아무도 안 왔어요.
4. Treating every question word as a real question. Learners often hear 뭐 먹었어요? as always "What did you eat?" Actually it can mean "Did you eat something?" Stress and intonation decide. See the edge case above.

Practice and Answers

These exercises check the outcome of this lesson: choosing the right form in a new sentence and fixing an error. Try each one before reading the answers.

Exercise 1: Choose the form. ___ 문을 두드려요. (Someone is knocking.)

Exercise 2: Fix the error. 아무것도 먹었어요. (The speaker means "I ate nothing.")

Exercise 3: Translate. "Anyone can do it." (can do = 할 수 있어요)

Exercise 4: Write your own. Write one sentence with 어딘가 and one sentence with 아무도.

Answer Key

• Exercise 1: 누군가 문을 두드려요. A person exists but is unknown, so use the "some-" word.
• Exercise 2: 아무것도 안 먹었어요. 아무것도 needs a negative verb, so add 안 before the verb.
• Exercise 3: 누구나 할 수 있어요. 아무나 할 수 있어요 is also correct and can sound more critical.
• Exercise 4: One model answer: 어딘가에 지갑을 놓고 왔어요. 아무도 없어요. The first sentence means "I left my wallet somewhere", and the second means "There is nobody."

If you missed Exercise 2, reread the rule about 도 and negatives. The next section shows where to go from here.

Next Lessons and Where to Go from Here

If the question words are still new, return to the lessons on 뭐 무엇 what in Korean, 누구 누가 who in Korean and 어디 where in Korean. The negative words get a full treatment in 아무도 아무것도 전혀 negative words. For the pointing words that sit next to these in the pronoun system, read 이 그 저 Korean demonstratives, and for the basic pronouns, Korean pronouns.

The next step in the verb track is Korean 하다 verbs noun + 하다. This lesson is one of the many lessons in the set Korean parts of speech.

What this lesson does not cover. It does not cover 어느, 어떤 or 몇 as indefinite words, the long list of 든지/이든 forms, or the contrast between 전혀 and 아무. Those belong to later lessons.

In short, the Korean indefinite pronouns 누군가 아무 come down to two families: add -ㄴ가 to a question word for "some-", and pair 아무도 and 아무것도 with a negative.

Frequently Asked Questions

What does 누군가/아무 mean? 누군가 means "someone", a person you cannot name. 아무 starts a family of words about "any" and "no": 아무나 means "anyone at all", and 아무도 means "no one" and needs a negative verb. The same idea works for things (무언가, 아무것도), places (어딘가) and times (언젠가).

How do I form 누군가/아무? For "some-" words, add -ㄴ가 to a question word: 누구 gives 누군가, 무엇 gives 무언가, 어디 gives 어딘가, and 언제 gives 언젠가. For "no-" and "any-" words, put 아무 before a particle: 아무도, 아무것도, 아무나, 아무거나. The 도 words need a negative verb.

What is the most common mistake with 누군가/아무? Using 아무도 or 아무것도 with a positive verb. 아무도 왔어요 is ungrammatical. Say 아무도 안 왔어요 (nobody came) or use 누군가 왔어요 (someone came). Learners also forget that 도 replaces 이/가 and 을/를, so 아무도가 and 아무것도를 are wrong.

How is 누군가/아무 different from similar forms? 누군가 names a real but unknown person. 아무나 says the choice does not matter, so any person will do. 아무도 says there is nobody, and it always takes a negative. 누구나 means "everyone, anyone" and takes a positive verb. The question word alone, 누구, can also mean "someone" in a question with a rising ending.

Do I use 누군가/아무 in speech, writing or both? Both. 누군가, 뭔가, 어딘가, 아무도 and 아무것도 are everyday spoken words. In speech, 무언가 is often shortened to 뭔가. In writing and in formal speech you will also see 무언가 and 누군가가 with the full subject particle. The word 아무나 can sound critical when it describes people.

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