-더라고요

-더라고요 tells someone about something you saw, heard or felt yourself in the past: 'I noticed that …'.

문장 끝·말투Endings & speech style

Han: -더라고요 reports what you observed, not your own deliberate action.

Examples

그 식당에 가 봤는데 음식이 정말 맛있더라고요.I tried that restaurant, and the food was really good.

한국 겨울은 생각보다 춥더라고요.Korean winters turned out to be colder than I thought.

주말이라서 그런지 사람이 많더라고요.Maybe because it was the weekend, there were a lot of people.

-더라고요vs-았/었어요-았/었어요 just states a past fact; -더라고요 adds 'I saw/felt it myself' and shares it: 맛있었어요 vs 맛있더라고요.

V/A+더라고요

N+(이)더라고요

맛있다 → 맛있더라고요, 많다 → 많더라고요

Based on your own direct experience, reported as new information to the listener.
Not used for your own deliberate actions (제가 갔더라고요 is unnatural); feelings are fine: 슬프더라고요.

Wrong: ~~제가 어제 도서관에 가더라고요.~~

Right: 어제 도서관에 갔는데 사람이 많더라고요.

-더라고요 reports what you observed, not your own deliberate action.

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