(IP (NP-SBJ (-NONE- *pro*)) (VP (ADVP (AD 颓然)) (VP (VV 跌坐) (PP (P 在) (LCP (NP (NN 椅子)) (LC 上))))))
ARG0: *pro* ARG1: 在 椅子 上 ARGM-ADV: 颓然 REL: 跌坐