(CP 
  (WHNP-1 
    (-NONE- *OP*))
                    
  (CP 
    (IP 
      (NP-SBJ 
        (-NONE- *pro*))
                    
      (VP 
        (NP-MNR 
          (-NONE- *T*-1))
                    
        (VP 
          (VV 炮击)
                    
          (NP-OBJ 
            (NP-PN 
              (NR 加沙)
                    
              (NN 地带))
                    
            (NP-PN 
              (NR 巴勒斯坦))
                    
            (NP 
              (NN 目标))))))
                    
    (DEC 的)))
                    
(VP 
  (NN 时候))))
arg0: 
                    *pro*          
                
argm: 
                    *T*-1 -> 时候          
                
arg1: 
                    加沙 地带 巴勒斯坦 目标