*stlibu unattested未見語料√ tlibutlibu + s-instrumental focus工具焦點用來圍著某物的；用…圍著某物to surround something with; the thing used for surrounding somethingroot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———