(IP (NP-SBJ (-NONE- *pro*))
(VP (ADVP (AD 都))
(VP (VC 是)
(NP-PRD (PP (P 在)
(LCP (IP (NP-SBJ (-NONE- *PRO*))
(VP (ADVP (AD 不))
(VP (VV 知)
(IP-Q-OBJ (NP-SBJ (-NONE- *PRO*))
(VP (ADVP-WH (AD 如何))
(VP (VV 表达)
(NP-OBJ (DNP (PP (P 对)
(NP (NP-APP (NN 儿子))
(NP-PN (NR 文通))))
(DEG 的))
(NP (NN 挚爱)))))))))
(LC 下)))
(PU ,)
(CP (WHNP-2 (-NONE- *OP*))
(CP (IP (NP-SBJ (-NONE- *T*-2))
(VP (VV 不得已)))
(DEC 的)
(DEC 的)))
(ADJP (JJ 变形))
(NP (NN 投射)
(NN 行为))))))
ARG1: *T*-2
REL: 不得已
(IP (NP-SBJ (NN 鸟))
(VP (IP-ADV (NP-SBJ (-NONE- *PRO*))
(VP (VV 不得已)))
(ADVP (AD 才))
(VP (VV 迁移))))
ARG0: *PRO*
REL: 不得已