*sntduwa unattested未見語料√ tduwatduwa + sn-instrumental focus工具焦點preterite過去式曾用來正確的what was used to correctroot詞根√ tduwaAF主事焦點LF處所焦點PF受事焦點IF工具焦點PRES現在式mtduwa——*stduwaPRET過去式*tmnduwa—*tnduwa*sntduwaFUT未來式*mptduwaDIST遠———