Japanese dialects
One of the distinctions between Tosa dialect and other Western Japanese dialects is the use of the verb suffixes "-yuu" and "-chuu" to show aspect. Grammatically, "-yuu" encapsulates the continuative and progressive aspects while "-chuu" separately encapsulates a repeated action or continuing state. In Standard Japanese both are represented by "-te-iru". The respective past tense forms are "-yotta" and "-chotta", while the negative forms are "-yasen" and "-chasen".