(IP 
  (NP-SBJ 
    (CP 
      (WHNP-1 
        (-NONE- *OP*))
                    
      (CP 
        (IP 
          (NP-SBJ 
            (-NONE- *pro*))
                    
          (VP 
            (VV 填妥)
                    
            (NP-OBJ 
              (-NONE- *T*-1))))
                    
        (DEC 的)))
                    
    (NP 
      (NN 表格)))
                    
  (VP 
    (VV 必须)
                    
    (VP 
      (VV 放入)
                    
      (NP-OBJ 
        (QP 
          (CD 一)
                    
          (CLP 
            (M 个)))
                    
        (ADJP 
          (JJ 白色))
                    
        (NP 
          (NN 信封))))))
arg0: 
                    *pro* 
                
arg1: 
                    *T*-1