*smtama unattested未見語料√ stamastama + ⟨m⟩agent focus主事焦點駐足to stop and standroot詞根√ stamaAF主事焦點LF處所焦點PF受事焦點IF工具焦點PRES現在式*smtama—stmaun*sstamaPRET過去式*smntama*sntmaan*sntama*snstamaFUT未來式*mpstamaDIST遠*mstamaIMMED近*sstmaan*sstmaun—IMP命令式stama—*stmai*stmani