Core Pattern Rule: Reporting Personal Experience with -더라고(요)
This pattern is used to report a fact or observation that you, the speaker, learned through direct personal experience in the past. It conveys a sense of recalling or realizing something firsthand.
Meaning & Usage
Meaning: It translates to "I recall that...", "I found that...", or "I saw that...". It adds a nuance that this is new information to the listener, based on your own experience.
When to use: Use it when sharing something you saw, heard, felt, or realized yourself. For example, telling a friend about a restaurant you tried, a movie you watched, or a place you visited.
Formation
Verbs & Adjectives: Attach -더라고(요) directly to the stem.
맛있다 → 맛있더라고(요)
어렵다 → 어렵더라고(요)
많다 → 많더라고(요)
Nouns: Attach -(이)더라고(요). Use -이더라고(요) after a consonant and -더라고(요) after a vowel.
학생 → 학생이더라고(요)
별거 아니다 → 별거 아니더라고(요)
Past Tense Observation: To report something that had already happened when you observed it, use -았/었더라고(요).
가다 → 갔더라고(요) (I saw that he/she had already gone.)
문을 닫다 → 문을 닫았더라고(요) (I found that they had closed the door.)
그 집 맛있더라고요. / 영화가 재미있더라고. / 시험이 어렵더라고요. / 갔는데 문을 닫았더라고.
Key Nuance: Subject of the Sentence
A crucial rule for -더라고(요) is that the subject of the sentence cannot be 'I' (the speaker) when describing an action. The speaker is the observer, not the actor.
Third-Person Subjects
You use this pattern to report your observation of someone else or a situation.
Correct: 친구가 영화를 보더라고요. (I saw my friend watching a movie.)
Incorrect: *제가 어제 영화를 보더라고요.
The 'I' Exception: Internal States & Feelings
You can use 'I' (나, 저, or implied) as the subject, but only when describing your own past internal state, emotion, or involuntary physical sensation. You are observing your own condition.