Grammar
N-인데요?
to ask for clarification about something
Form
Interrogative nominal + -(인)데요? — “which / what exactly?” depending on the word.
Function
The ending -ㄴ/은데요? can prompt an explanation by implying information is missing; nouns use -(인)데요.
Why this form?
N-이에요/예요? — “is it…?”: direct identification question without setting up a point needing clarification.
N-(이)죠? — “it’s …, right?”: tends to seek confirmation of an assumption.
Forms not to confuse
- N-이에요/예요?
그게 뭐예요? — What is that?
- N-(이)죠?
이게 문제죠? — This is the problem, right?
Examples
뭔데요? — What is it, then?
그게 무슨 일인데요? — What is that about, then?