(IP 
  (NP-SBJ 
    (NP-PN 
      (NR 天津))
                    
    (NP 
      (NN 市政府)))
                    
  (VP 
    (VV 许诺)
                    
    (IP-OBJ 
      (NP-SBJ 
        (-NONE- *PRO*))
                    
      (VP 
        (DP-ADV 
          (DT 每)
                    
          (CLP 
            (M 年)))
                    
        (PP-BNF 
          (P 为)
                    
          (NP 
            (NN 群众)))
                    
        (VP 
          (VV 办)
                    
          (NP-OBJ 
            (QP 
              (CD 二十)
                    
              (CLP 
                (M 件)))
                    
            (NP 
              (NN 实事))))))))
arg0: 
                    天津 市政府 
                
arg1: 
                    *PRO* 每 年 为 群众 办 二十 件 实事