Negative forms of SA-gyo and KA-gyo henkaku katsuyo (SA-row and KA-row irregular conjugation group verbs) conjugate frequently at 'i' dan (i-grade,) in which cases 'hin' shall be fixed as a relevant postpositional particle.
さ行変格活用、か行変格活用の否定は、い段で活用することが多く、その場合否定の助詞は「ひん」となる。