(IP (ADVP (AD 但))
(NP-SBJ (-NONE- *pro*))
(VP (VP (VV 知道)
(IP-OBJ (NP-SBJ (-NONE- *pro*))
(VP (VPT (VV 起)
(AD 不)
(VV 了))
(NP-OBJ (NN 作用)))))
(PU ，)
(VP (ADVP (AD 只))
(VP (VV 得)
(VP (ADVP (AD 黯然))
(VP (VV 回府)))))))
ARG0: *pro*
ARGM-ADV: 黯然
ARGM-ADV: 只
ARGM-DIS: 但
REL: 回府