�?블로�?전체 카테고리 글 전체글 보기 화면 최상단으�?이동 If a grammatical principle that may be additional to 서툴�?is a vowel �?and there's no other solution apart from a vowel �?then that grammatical basic principle cannot be extra to 서툴�? It is incorrect to incorporate any grammatical principle beginning that has Successfully Submitted (Awaiting Approval)