we ▁' always ' ▁ ▁k xy ▁ ▁pu k xy i ▁' loop ' ▁ ▁Gram mar ▁ ▁Mor ph oph on em ics ▁▁ ▁There ▁are ▁many ▁verb ▁roots ▁and ▁two ▁mode ▁markers ▁with ▁the ▁morph oph on em ically - condition ed ▁altern ation ▁e ~ a ~ i ▁( under lying ▁|| E || ): ▁▁ ▁d E ▁' go ' ▁ ▁and E , ▁y uk E ▁' be ' ▁ ▁y E ▁' c ause ' ▁ ▁E ▁' say ' ▁▁ ▁t E ▁' [ opt ative ▁mode ▁marker ] ' ▁ ▁d and E ▁' [ pot ential ▁mode ▁marker ] ' ▁ ▁The ▁altern ation ▁depends ▁on ▁the ▁following ▁morph eme : ▁ ▁N oun s ▁and ▁ver bs ▁whose ▁st ems ▁end ▁in ▁- V hi ▁or ▁- V h į ▁change ▁to ▁- V x ▁before ▁the ▁pl ural ▁marker ▁- tu : ▁ ▁|| an ah į ▁+ ▁tu || ▁> ▁/ ana xt u / ▁' the ir ▁hair '. ▁ ▁That ▁may ▁occur ▁with ▁dut i ▁' to ▁eat ' ▁also : ▁ ▁|| d uti ▁+ ▁tu || ▁> ▁/ d ut itu / ~/ du xt u / ▁' they ▁eat '. ▁ ▁The ▁rule ▁may ▁option ally ▁also ▁apply ▁in ▁comp ounds ▁and ▁across ▁word ▁boundaries ▁if ▁the ▁next ▁element ▁starts ▁with ▁CV : ▁ ▁|| as ą hi ▁+ ▁n ǫ pa || ▁> ▁/ as ą x ▁n ǫ pa / ▁' both ▁arms