*gnrebu unattested未見語料√ grebugrebu + ⟨n⟩patient focus受事焦點preterite過去式（更）早上過的；已把…（更）早上what was earliered in the morning; earliered in the morning itroot詞根√ grebuAF主事焦點LF處所焦點PF受事焦點IF工具焦點PRES現在式*gmrebu——*sgrebuPRET過去式*gmnrebu—*gnrebu*sngrebuFUT未來式*mpgrebuDIST遠———IMP命令式——grbui—derived stems衍生詞幹AF主事焦點LF處所焦點PF受事焦點IF工具焦點CAUS使動pgrebu———