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This study was designed to find whether the ‘e>i/i+ ―’ rule had existed in the Yngnam dialect by looking into the historical changes and distri- bution areas of the conjugated forms when the verb stems with an “i” in the ending position were combined with an ending “a”. These conjugated forms were chosen from the Hanguk pangn charyojip (Ⅰ-Ⅸ)(books of Korean dialect materials). As a result, the following three conclusions were reached.1. In addition to the proven ‘e>i’ rule, the ‘e>i/i+ ―’ rule, which applied to the morpheme boundary, was also present in Yngnam dialect.2. The ‘e>i/i+ ―’ rule was thought to have spread into other provinces that border Yngnam Province, such as North Ch'ungchng Province, North and South Chlla Provinces and Kangwon Province.3. In 15th century Korean, when verb stems with an ‘i’ in the ending position combined with an ending ‘a’, they conjugated in two different ways; the y-gliding form, or the y-addition form. This is because the ‘y-gliding rule’ of non-Yngnam dialects and the ‘y-addition rule’ of Yngnam dialect were applied to the above-mentioned verb stems competitively.