(IP (NP-SBJ (-NONE- *pro*))
(VP (ADVP (AD 不时))
(ADVP (AD 还))
(VP (VV 可以)
(VP (VV 听到)
(NP-OBJ (CP (WHNP-1 (-NONE- *OP*))
(CP (IP (NP-SBJ (-NONE- *T*-1))
(VP (VA 零星)))
(DEC 的)))
(NP (NN 枪声)))))))
ARG0: *T*-1
REL: 零星