How to translate this sentence ? 그 강연은 시작한 지 세 시간 만에 끝났어요. Hello.everyone.how to translate the above sentence.Could you help me? Especially the meaning of 시작한 지 .Thanks

How to use honorific of Korean? Could you tell me how to use honorific of Korean 존대말 and 반말? which situation do you people need to use honorific? and which situation can people not use honorific? For example,If a girl and a boy are friends,and the girl is younger than the boy,when they are chatting,does the girl need speak 존대말 to the boy?

how to use 군요 그렇구나 and 그렇군요,there are differences between them? how to use 구나 and 군요?thanks

I am not very clear about 주다.could you do me a favor ? 이 국을 데워다가 주시겠어요?꽃을 사다가 주었습니다.커피를 끓여다가 드리겠습니다. I think i don't know who are the subjects of these sentences?and who is the receiver ?how to understand theses sentences?

a dog's story today i found a piece of music,that made me thought of the movie.it is called "Hachi:A dog's tale".A man picked up a little dog on his way home in a night.the dog was called hachi, Hachi grew up under the care of the master,and he always put the master to the station every morning and waited for the man in advance in the afternoon,but one day,the man suddenly dead on his class, however,the dog still went to wait for the man everyday,it insisted for almost ten years,although people who knew the dog told him the man wouldn't appear.the dog finally dead.a sad ending... ' i like watching movies,i like this movie very much,it is a story between a man and a dog.and it is a real story which happened in Japan many years ago.