*snbruwa unattested未見語料√ bruwabruwa + sn-instrumental focus工具焦點preterite過去式曾用來雷的what was used to thunderroot詞根√ bruwaAF主事焦點LF處所焦點PF受事焦點IF工具焦點PRES現在式mbruwa——*sbruwaPRET過去式*bmnruwa—*bnruwa*snbruwaFUT未來式*mpbruwaDIST遠———