(NP-SBJ 
  (CP 
    (WHNP-1 
      (-NONE- *OP*))
                    
    (CP 
      (IP 
        (NP-SBJ 
          (-NONE- *T*-1))
                    
        (VP 
          (ADVP 
            (AD 曾经))
                    
          (PP-LOC 
            (P 在)
                    
            (NP 
              (NN 书房) ))
                    
          (VP 
            (VV 看)
                    
            (AS 过)
                    
            (NP-OBJ 
              (NN 老师) )
                    
            (IP 
              (NP-SBJ 
                (-NONE- *PRO*))
                    
              (VP 
                (VV 篆刻))))))
                    
      (DEC 的)))
                    
  (NP-PN 
    (NR 薛平南) ))
arg0: 
                    *PRO*