The purpose of this study is to clarify the meaning and syntactic characteristics of the auxiliary verb ‘Nagata’. This study insists ‘Nagata’ has its own unique meaning that distinguishes it from the original word, and its syntactic character is the same as other auxiliary verbs, although ‘Nagata’ has been rarely addressed in the studies on auxiliary verbs. Firstly, this study described the meaning of ‘Nagata’ based on the contrast with other expressions of progression. In addition, it has been pointed out that the auxiliary verb ‘Nagata’ is an auxiliary verb from ‘Na-a-gata’ rather than from the verb ‘Nagata’ and has a meaning derived from ‘Na-a-gata’. Secondly, the combinatorial Patterns of ‘Nagata’ and verbs which is the most important syntactic characteristic of the auxiliary verb ‘Nagata’ are described. These are based on the analysis of a quantitative linguistic methods that calculate the combination frequency of each verb and the auxiliary verb ‘Nagata’ with t score. The results of this study can be widely used in future studies such as research on composition of auxiliary verbs, research on dictionary contents, and study on the meaning discrimination between similar grammatical items in the field of Korean language education as a foreign language.