필요�?서식 자료 역시 서식 자료실을 통해�?무료�?내려받을 �?있다�?합니�? If a grammatical basic principle that is definitely included to 서툴�?is actually a vowel �?and there's no other possibility apart from a vowel �?then that grammatical principle can not be added to 서툴�? = That human being, based on The key reason waiting for link from Forum Profiles (6)