Grammar: -거든

-거든 has two separate usages:

Usage #1: explanatory sentence ending “it’s because”, “you see”
-거든 is a one-shape ending that is preceded by the past tense marker or the future tense marker.

It can be used to add an explanation to a previous sentence or to explain where you have a specific bit of information from.

From episode 7 in 너의 목소리가 들려:
관우: (…) 얘가 혹시 어제 아는 동생이에요? 사고쳤다는 그?
혜성: 아.. 네. 혹시 이상한 오해하면 어떡하지? 내가 좀 쓸데없이 책임감이 있는 편이라 얘 보호자로 엮였거든요.

Usage #2: “if”
This usage is somewhat similar to -(으)면 but differs in that -거든 is usually followed by either a command, a proposition or a promise.

Example from Korean – A Comprehensive Grammar p. 316:
“If you don’t have enough money, tell me” would take -거든 because of the command “tell me” that follows.
돈이 모자라거든 나한테 말 해.

Beware of the certainty with which something will happen:
-(으)면 is carries less certainty than -거든. That is, when using -거든, something is considered quite likely to happen.

Example from Korean – A Comprehensive Grammar p. 316:
“If the children enter university, I guess we’ll move”
아이들이 대학교에 가거든 이사를 하겠어요.

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