-더군요

I found / noticed that … (recollected realization)

Level 4 · TOPIK II · intermediate

How to use it

Reports something the speaker realized through their own past experience, with a tone of realization or mild surprise. A bit more formal than -더라고요.

Forming it

크다	→ 크더군요
많다	→ 많더군요
잘하다	→ 잘하더군요
학생	→ 학생이더군요

Not for your own deliberate actions (✗ 제가 많이 먹더군요) and not for things you only heard about.

Examples

제주도는 생각보다 바람이 많이 불더군요.
Jeju Island was much windier than I expected.
그 아이가 한국어를 아주 잘하더군요.
That child spoke Korean really well, I noticed.

Compared with similar patterns

-더라고요 (G3-007) means almost the same and is more common in casual speech. -군요 (G2-015) is a realization at the moment of speaking; -더군요 is about something realized earlier. -던데요 (G4-003) implies contrast or expects a reaction.