*sntretun unattested未見語料√ tretuntretun + sn-instrumental focus工具焦點preterite過去式曾用來慫恿的what was used to egg onroot詞根√ tretunAF主事焦點LF處所焦點PF受事焦點IF工具焦點PRES現在式tmretun*tretan—*stretunPRET過去式*tmnretun*tnretan*tnretun*sntretunFUT未來式*mptretunDIST遠*mtretunIMMED近*ttretan*ttretun—IMP命令式tretun—*treti*trtani