Core Pattern Rule: -거든요
The pattern -거든요 is a sentence ending used to provide background information, a reason, or a fact that the listener is likely unaware of. It's often translated as "you see...", "because...", or carries an "actually..." or "for your information..." nuance.
Meaning & Usage
Providing a Reason: It explains the 'why' behind a statement or action. The sentence with -거든요 often comes after a question or before the main point.
Introducing New Information: It's used to state a fact that you assume the other person doesn't know, sometimes to gently correct them or preempt a question.
Formation
It attaches directly to verb and adjective stems.
Verbs/Adjectives: Stem + 거든요
하다 -> 하거든요
바쁘다 -> 바쁘거든요
있다 -> 있거든요
Nouns: Noun + -(이)거든요
학생 (ends in consonant) -> 학생이거든요
거 (ends in vowel) -> 거거든요
Past Tense: Stem + -았/었거든요
했다 -> 했거든요
거짓말이었다 -> 거짓말이었거든요
나 배 안 고프거든. / 사실 거짓말이었거든요. / 제가 좋아하거든요. / 맛있거든요.
Native Nuance: Conversational Flow
-거든요 is a classic conversational connector. It signals that what you're saying is relevant to the situation, but it's not the final point. It creates an expectation that more information is coming or that the listener should now understand the context.
As a Reason
When used as a reason, the sentence with -거든요 often feels slightly incomplete on its own. It naturally invites a follow-up statement.
(왜 이렇게 많이 샀어요?) 제가 좋아하거든요. (Because I like it. [Implication: So I bought a lot.])
(같이 갈 수 있어요?) 저 좀 바쁘거든요. (Actually, I'm a bit busy. [Implication: So I can't go.])
As a Gentle Correction or Statement
When stating a fact the listener doesn't know, it can be used to gently correct a misunderstanding or assert something.
그거 제 거거든요. (That's mine, you know. [So please don't touch it.])