*snkaro unattested未見語料√ skaroskaro + ⟨n⟩patient focus受事焦點preterite過去式墊腳過的；已把…墊腳what was standed on tiptoe; standed on tiptoe itroot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———