Analysis of Korean textbooks for the choosing of the noun modification form ‘-을’ or ‘-는’

Objectives The purpose of this study is to determine whether Korean textbooks provide an opportunity to choose ‘-을’ or ‘-는’ as a selection condition by frequency of the subcategories of determiner clauses, frequency of the verb types and class under subcategories of determiner clauses, frequency of the verb types and class and noun categories under subcategories of determiner clauses. Therefore to determine if it fits the selection condition, examine frequency of the subcategories of determiner clauses, frequency of the verb types and class under subcategories of determiner clauses, frequency of the verb types and class and noun categories under subcategories of determiner clauses in Korean textbooks. Methods From the textbooks of Korea University and Ewha Women's University, ‘subject / object – verb + ‘-을, -는’ - noun category’ is collected. Introductory dialogue, grammar explanation, example sentence presentation, sentence completion/connection practice, dialogue completion, functional practice, and task activity consider the frequency of using the subcategories of determiner clauses, the verb types and class under subcategories of determiner clauses, the verb types and class and noun categories under subcategories of determiner clauses. Results Korea University and Ewha Womans University textbooks did not explicitly explain the conditions for choosing ‘-을’ or ‘-는’ for grammar explanation, and provided some opportunities for sentence completion / connection practice, dialogue completion, and functional practice to choose ‘-을’ or ‘-는’. Sentence completion / connection practice, and dialogue completion reflected the choosing conditions related to the subcategories of determiner clauses, the verb types and class under subcategories of determiner clauses. while functional practice reflected the choosing conditions related to the verb types and class and noun categories under subcategories of determiner clauses. Conclusions Korea University and Ewha Womans University textbooks should explicitly explain the conditions for choosing ‘-을’ or ‘-는’ in grammar explanation to improve communication skills, and provide opportunities to choose ‘-을’ or ‘-는’ for sentence completion / connection practice, connection practice, dialogue completion, and functional practice.