 Exceptions are the anaphor "á" “it, that”, the relational nouns "ká" “surface” and "yá" “face”, and the pronominal bases "xha-" “1st person singular”, "du-" “3rd person neutral”, "tu-" “reflexive“, "khu-" “indefinite human”, and "-.i-" “pronominal base”.The ergative postposition is "-ch".It marks the agent of a transitive verb with a definite object.