(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: 
                    *pro* 
                
arg1: 
                    *OP* *T*-1 零星 的 枪声 
                
argm: 
                    还 
                
argm: 
                    不时