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TOPIK I Core Vocabulary · Questions ①

September 14, 2026

Question words — 누구, 뭐, 어디, 언제, 왜

A Korean question word stays in the place where the answer goes. In 이름이 뭐예요?, 뭐 sits in the same place as the name in the answer.

01누구nugu

who · asks about a person.

Note Before 이/가, 누구 changes to 누가. Say 누가 왔어요?, not 누구가 왔어요?.

Examples 누구예요? (who is it?) · 누구와 가요? (who are you going with?) · 누가 왔어요? (who came?)

저 사람은 누구예요? Who's that?  |  저 = that, over there  |  Notice that the question word comes at the end

02뭐(무엇)mwo (mueot)

what · asks about a thing or an action.

Note People use 뭐 in speech. 무엇 is more common in writing and in formal situations.

Examples 뭐예요? (what is it?) · 뭐를 해요? (what are you doing?) · 뭐 먹을까요? (what shall we eat?)

이름이 뭐예요? What is your name?  |  이름 = name  |  This is the most common question when you meet someone new

03어디eodi

where · asks about a place.

Note The particle (a small word added after a noun) depends on the job of the place. Use 어디에 for a location. Use 어디에서 for the place of an action. Use 어디로 for the place you are going to.

Examples 어디예요? (where is it?) · 어디에서 만나요? (where shall we meet?)

화장실이 어디에 있어요? Where is the restroom?  |  화장실 = restroom  |  You can use this sentence just as it is to ask for directions

04언제eonje

when · asks about a time.

Note 언제 does not take 에: 언제 가요? You can still add other particles, as in 언제까지 (until when).

Examples 언제 가요? (when are you going?) · 언제까지예요? (until when?)

시험이 언제예요? When is the exam?  |  시험 = exam  |  Use 언제 시간 있어요? when you make plans

05왜wae

why · asks about a reason.

Note Answers often use -아/어서 or 때문에: 아파서요 (because I was ill), 일 때문에요 (because of work).

Examples 왜 그래요? (what's wrong?) · 왜 안 왔어요? (why didn't you come?)

어제 왜 안 왔어요? Why didn't you come yesterday?  |  안 adds the meaning not to the verb  |  This question can sound sharp. Use a gentle tone to stay polite

Quick check3 questions

Fill in each blank in Korean. Every answer appears above.

  1. 이름이 __________예요? (______ is your name?)
  2. 화장실이 __________에 있어요? (______ is the restroom?)
  3. 어제 __________ 안 왔어요? (______ didn't you come?)
Show answers

1. 뭐   2. 어디   3. 왜

Study tip Korean question words stay in the place of the answer. In 이름이 뭐예요?, put the answer in place of 뭐 to make a statement: 이름이 민수예요. Use this pattern to practice questions and answers together.
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