(IP (NP-SBJ (-NONE- *PRO*))
(VP (VV 担心)
(NP-OBJ (CP (WHNP-1 (-NONE- *OP*))
(CP (IP (NP-SBJ (-NONE- *T*-1))
(VP (VV 年迈)))
(DEC 的)))
(NP (NN 父母)))
(IP (NP-SBJ (-NONE- *PRO*))
(VP (ADVP (AD 太过))
(VP (VV 劳累))))))
ARG0: *T*-1
REL: 年迈