(IP 
  (ADVP 
    (AD 而))
                    
  (NP-PN-SBJ 
    (NR 马可夫))
                    
  (VP 
    (ADVP 
      (AD 也))
                    
    (VP 
      (VV 承认)
                    
      (IP-OBJ 
        (NP-SBJ 
          (PN 他))
                    
        (VP 
          (ADVP 
            (AD 未))
                    
          (PP-MNR 
            (P 经)
                    
            (NP 
              (NN 查证)))
                    
          (ADVP 
            (AD 就))
                    
          (VP 
            (VV 下笔)))))))
arg0: 
                    他 
                
argm: 
                    就 
                
argm: 
                    经 查证 
                
argm: 
                    未