*snskaro unattested未見語料√ skaroskaro + sn-instrumental focus工具焦點preterite過去式曾用來墊腳的what was used to stand on tiptoeroot詞根√ skaroAF主事焦點LF處所焦點PF受事焦點IF工具焦點PRES現在式*smkaro——skkaroPRET過去式*smnkaro—*snkaro*snskaroFUT未來式*mpskaroDIST遠*mskaroIMMED近———