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양성모음 and 음성모음 (positive vowel and negative vowel) 양성모음 : ㅏ ㅗ ㅑ ㅛ ㅘ ㅙ ㅒ 음성모음 : ㅓ ㅜ ㅕ ㅠ ㅝ ㅞ ㅖ ㅢ 중성모음 : ㅣ It affects some changing word. Let's look how it affects. 양성모음 : ㅏ of 빠 : 빠르다 -> 빨라 : 르다 changed as ㄹ라 음성모음 : ㅓ of 부 :부르다 -> 불러 : 르다 changed as ㄹ러 양성모음 : ㅗ of 모 : 모르다 -> 몰라 : 르다 changed as ㄹ라 음성모음 : ㅜ of 구 : 구르다 -> 굴러 : 르다 changed as ㄹ러