Chang, Kyung-hee. Jeon, Eun-jin. Lee, U-yeon. & Gweon, Mi-jeong. 2009. A Study on Infants' Acquisition of Connective Ending Forms. Korean Semantics, 30. This study is an examination of Infants' Acquisition of connective ending forms. There is an individual difference in language development, but significant similarity can be seen in the process. As basic research, we have surveyed of actual state of ending uses in terms of connective ending types, occurrence orders and frequency level. Depending on these results, we made an attempt to find the universality of the period and order of the acquisition. In conclusion, this study assumes that the connective ending form initially learned by infants, is ‘-go’ and followed by ‘-myeon’ and ‘-aseo’ and, the developmental stages of connective endings can be divided into four ones. The endings belonging to the first stage include ‘-go, -myeon, -aseo’ which are used by 6 infants. The second stage include ‘-ryeogo, -nikka, -daga and -neunde’, which are learned more or less during this period, even though individual differences exist. The third stage include ‘-ni, -ado, -myeonseo, -ryeo, and -reo’. And the fourth stage include ‘-aya, -ryeomyeon, -atja, -goseo, -deoni, and -jiman’, that these forms are learned by infants of three years and over. According to the research result, we have concluded that the development of connective endings with children of 30 months and over reaches a stable stage and they use connective endings in a similar frequency to adults.