 Consonant-root verbs consist of the quadrigrade, N-irregular and R-irregular verbs.The irregularity of N-irregular verbs occurs only in the conclusive and the attributive, and as there are no quadrigrade verbs with an "n"-root we can treat quadrigrade and N-irregular verb patterns as being in complementary distribution.Vowel-root verbs consist of bigrade verbs (the majority), a few monograde verbs (especially "mi"- 'see' and "wi"- 'sit'), the K-irregular verb "ko"- 'come', and the S-irregular verb "se"- 'do' (or -"ze"- in some compounds).