The purpose of this paper is to show the one of reason`s constructions is represented in connection endings, and the other is represented in connection phrases in Korean. First of all this paper has mainly focused on ``-기에``, ``-길래`` among reason`s connection endings, because others was finely investigated by former papers before. Second, this paper claims that ``-기 때문에``, ``-는 바람에``, ``-는 탓에``, ``-는 통에`` are connection phrases. Because these phrases constitute unique construction in the respect other word isn`t inserted between these phrase, a movement as a whole, subject-verb relation. What is more this paper shows that morphological·syntactic features and constraints of reason`s construction. Eventually, this paper claims that reason`s construction should be represented and taught hierarchically in Korean education.
