*tnlibu unattested未見語料√ tlibutlibu + ⟨n⟩patient focus受事焦點preterite過去式圍著某物過的；已把…圍著某物what was surrounded something; surrounded something itroot詞根√ tlibuAF主事焦點LF處所焦點PF受事焦點IF工具焦點PRES現在式mtlibu——*stlibuPRET過去式*tmnlibu—*tnlibu*sntlibuFUT未來式*mptlibuDIST遠———