필요�?서식 자료 역시 서식 자료실을 통해�?무료�?내려받을 �?있다�?합니�? If a grammatical principle which is added to 서툴�?is usually a vowel �?and there is no other alternative besides a vowel �?then that grammatical basic principle cannot be additional to 서툴�? *도난�?경우 보상�