"만들줄 알아요."입니다. "들을", It is used to complex number, for example, "Where are they going?" "자네들은 어디로 가나요?"~ "car key" 는 "차동차키"라고 해도 문제가 없지만 일상생활에서는 그냥 간단하게 "차키"라고 많이 사용합니다. As I know, the word "Korea" is form "Corea", and "Corea", this word originated from the '고려(高麗)' dynasty, in the 13th century the westerners called the '고려(高麗)' dynasty "Caule" or "Cauly". This is what I know~ Hope these answer would be helpful to you~ ^____^