�?블로�?전체 카테고리 글 전체글 보기 화면 최상단으�?이동 If a grammatical principle that is definitely additional to 서툴�?is actually a vowel �?and there is no other selection besides a vowel �?then that grammatical theory can not be added to 서툴�? In exercise, the word “있다�?can alter to a