필요�?서식 자료 역시 서식 자료실을 통해�?무료�?내려받을 �?있다�?합니�? If a grammatical principle that is included to 서툴�?is actually a vowel �?and there's no other option in addition to a vowel �?then that grammatical principle can't be added to 서툴�? If a grammatical basic principle t