(IP (NP-SBJ (PN 大家))
(VP (CC 既)
(VP (PP-BNF (P 为)
(NP (PN 他们)))
(VP (VV 惋惜)))
(PU ，)
(CC 又)
(VP (VV 觉得)
(IP-OBJ (NP-SBJ (PN 这))
(VP (VC 是)
(NP-PRD (QP (CD 一)
(CLP (M 个)))
(CP (WHNP-1 (-NONE- *OP*))
(CP (IP (NP-SBJ (-NONE- *T*-1))
(VP (ADVP (AD 非常))
(VP (VV 值得)
(NP-OBJ (NN 忧虑)))))
(DEC 的)))
(NP (NN 问题))))))))
ARG0: 大家
ARG1: 为 他们
REL: 惋惜