필요�?서식 자료 역시 서식 자료실을 통해�?무료�?내려받을 �?있다�?합니�? If a grammatical principle that is additional to 서툴�?is often a vowel �?and there is no other selection other than a vowel �?then that grammatical theory can't be added to 서툴�? It is incorrect so as to add any gramm