( 
  (IP-SBJ 
    (NP-SBJ 
      (-NONE- *pro*))
                    
    (VP 
      (VP 
        (VV 藏有)
                    
        (NP-OBJ 
          (CP 
            (WHNP-1 
              (-NONE- *OP*))
                    
            (IP 
              (NP-SBJ 
                (-NONE- *pro*))
                    
              (VP 
                (VV 伪造)
                    
                (NP-OBJ 
                  (-NONE- *T*-1)))))
                    
          (NP 
            (NN 旅行)
                    
            (NN 证件))))
                    
      (CC 或)
                    
      (VP 
        (ADVP 
          (AD 非法))
                    
        (VP 
          (VV 更改)
                    
          (NP-OBJ 
            (NN 旅行)
                    
            (NN 证件)))))))
arg0: 
                    *pro*