Simple Questions
Use question words to ask about people, places, and things.
Korean question words follow the same grammatical position as their English equivalents but combine with different question endings. 누구 (who), 어디 (where), 뭐 (what, casual) / 무엇 (what, formal), 언제 (when), 왜 (why), 어떻게 (how), 얼마 (how much). In polite speech, all of these typically appear in sentences ending with -아요/어요 or -이에요/예요 with a rising intonation marking the question.
A key difference from English: Korean does not require subject-verb inversion to form questions. 'You are a student' is 학생이에요, and 'are you a student?' is also 학생이에요? — the only difference is the intonation. Even with question words, the word order stays subject-object-verb. 'Where are you going?' is 어디 가요? not 'go you where?'. This is identical to Japanese in structure, so Japanese speakers can build questions in Korean almost by reflex.
이에요/예요? (Polite Question)
Turn a polite statement into a question by rising intonation or adding a question mark.
Question Words + Copula
Place question words (어디, 누구, 무엇) before the copula to ask simple questions.
Cultural & Language Note
Korean forms questions without inverting the word order — 학생이에요 is 'you are a student' and 학생이에요? is 'are you a student?', separated only by rising intonation. This works exactly like Japanese, where 学生です becomes 学生ですか. English speakers must unlearn subject-verb inversion here; Japanese speakers can simply carry over the habit they already have.
Common Mistakes to Avoid
뭐 and 무엇 are not interchangeable in register: 뭐 is casual and by far the more common in speech, while 무엇 belongs to writing and formal contexts. Saying 무엇을 드시겠어요 to a friend sounds stiff. Learners also drop the rising intonation and produce a flat sentence that a Korean listener will hear as a statement rather than a question.