(IP 
  (NP-SBJ 
    (-NONE- *pro*))
                    
  (VP 
    (NP-TMP 
      (NT 以前))
                    
    (ADVP 
      (AD 总))
                    
    (VP 
      (VV 说)
                    
      (PU ，)
                    
      (IP-OBJ 
        (NP-SBJ 
          (NN 中年))
                    
        (VP 
          (VC 是)
                    
          (NP-PRD 
            (CP 
              (WHNP-1 
                (-NONE- *OP*))
                    
              (CP 
                (IP 
                  (NP-SBJ 
                    (-NONE- *T*-1))
                    
                  (VP 
                    (VV 承先启後)))
                    
                (DEC 的)))
                    
            (NP 
              (NN 世代))))))))
arg0: 
                    *T*-1