(IP 
  (IP-TMP 
    (NP-SBJ 
      (-NONE- *PRO*))
                    
    (VP 
      (VV 从古至今)))
                    
  (PU ，)
                    
  (NP-TPC 
    (CP-APP 
      (IP 
        (NP-SBJ 
          (-NONE- *PRO*))
                    
        (VP 
          (VP 
            (PP-LOC 
              (P 在)
                    
              (LCP 
                (NP 
                  (NN 地))
                    
                (LC 上)))
                    
            (VP 
              (VV 挖)
                    
              (NP-OBJ 
                (QP 
                  (CD 几)
                    
                  (CLP 
                    (M 个)))
                    
                (NP 
                  (NN 洞)))))
                    
          (PU ，)
                    
          (VP 
            (BA 把)
                    
            (IP-OBJ 
              (NP-SBJ 
                (NN 球))
                    
              (VP 
                (VRD 
                  (VV 推)
                    
                  (VV 进去)))))))
                    
      (DEC 的))
                    
    (NP 
      (NN 游戏)))
                    
  (PU ，)
                    
  (NP-SBJ 
    (-NONE- *PRO*))
                    
  (VP 
    (ADVP 
      (AD 更))
                    
    (ADVP 
      (AD 不))
                    
    (VP 
      (VV 知)
                    
      (QP-OBJ 
        (CD 凡几)))))
arg0: 
                    *PRO*