(IP (ADVP (AD 然而))
(PP-TMP (P 当)
(NP (CP (WHNP-1 (-NONE- *OP*))
(CP (IP (NP-SBJ (PN 他们))
(VP (NP-TMP (-NONE- *T*-1))
(VP (VV 购买)
(NP-OBJ (NN 物品)))))
(DEC 的)))
(NP (NN 时候))))
(PU ，)
(NP-SBJ (-NONE- *pro*))
(VP (ADVP (AD 却))
(ADVP (AD 从来))
(ADVP (AD 不))
(VP (VV 讲价))))
ARG0: *pro*
ARGM-ADV: 不
ARGM-ADV: 从来
ARGM-ADV: 却
ARGM-TMP: 当 *OP* 他们 *T*-1 购买 物品 的 时候
ARGM-DIS: 然而
REL: 讲价