Quoted from http://www.learnkoreanlp.com/2012/12/learn-korean-language-learned.html ~더라고(요) is used when you talk about something you've learned by your own experience or from someone else or some other things (e.g. books, TV and internet). Replace 다 of a plain form of verbs/adjectives with 더라고. 하다 → 하더라고 = (learned that someone) was doing Example sentence: 진수는 음악을 전공 하더라고 = I learned that Jinsu was doing a major in music 가더라고 = (I learned that) was going 오더라고 = (I learned that) was coming 먹더라고 = (I learned that) was eating 마시더라고 = (I learned that) was drinking 살더라고 = (I learned that) was living 만들더라고 = (I learned that) was making 일하더라고 = (I learned that) was working 자더라고 = (I learned that) was sleeping 높더라고 = (I learned that) was high 낮더라고 = (I learned that) was low 크더라고 = (I learned that) was big/large 작더라고 = (I learned that) was small (in size) 빠르더라고 = (I learned that) was fast 느리더라고 = (I learned that) was slow 많더라고 = (I learned that) was many 적더라고 = (I learned that) was small (in quantity) Attach 요 to 더라고 to make it a polite form. 하더라고요 (Polite spoken form) 가더라고요 많더라고요 크더라고요 Example sentences: 급하게 어디를 가더라고요 = (He was) going somewhere in a hurry 기린은 목이 길더라고요 = (I learned that) a giraffe has a long neck. 큰 배가 항구를 향해 오더라고요 = (I learned/saw that) a big ship was coming towards the port 그렇게 생각하니까 편해지더라고요 = (I learned that) I became (more) relaxed as I think that way