�?블로�?전체 카테고리 글 전체글 보기 화면 최상단으�?이동 If a grammatical basic principle which is added to 서툴�?is often a vowel �?and there is no other option aside from a vowel �?then that grammatical theory can not be extra to 서툴�? In follow, the term “있다�?can change to another verb t