-거든요

V/Adj/이다, 아니다 + 거든(요) It’s used to state a reason or fact as if it were obvious, especially when it is assumed that the listener will not know about it.

A: 한국은 터널이 많은 거 같아요. It seems like Korea has a lot of tunnels.

켈리 씨는 사실 영어를 못해요. 한국에서 자랐거든요.

Kelly actually can't speak English. That's because she grew up in Korea.

태형 씨는 인기가 많아. 고민을 잘 들어주거든.

Taehyung is very popular. He's really good at listening to people's problems.

• Tense: 었O, 겠X

간식을 먹었거든요 O

간식을 먹겠거든요 X 간식을 먹을 거거든요 O