(IP 
  (IP-ADV 
    (NP-SBJ 
      (-NONE- *PRO*))
                    
    (VP 
      (DP-ADV 
        (DT 每))
                    
      (VP 
        (VV 到)
                    
        (NP-OBJ 
          (NN 雨季)))))
                    
  (PU ，)
                    
  (NP-PN-SBJ 
    (NR 洞庭湖))
                    
  (VP 
    (ADVP 
      (AD 往往))
                    
    (VP 
      (VP 
        (VV 受)
                    
        (NP-OBJ 
          (DNP 
            (NP 
              (NP 
                (PU “)
                    
                (QP 
                  (CD 四))
                    
                (NP 
                  (NN 水))
                    
                (PU ”))
                    
              (CC 和)
                    
              (NP-PN 
                (NR 长江)))
                    
            (DEG 的))
                    
          (NP 
            (NN 顶托))))
                    
      (VP 
        (MSP 而)
                    
        (VP 
          (VV 洪水泛滥)))))
                    
  (PU 。))
arg0: 
                    洞庭湖 
                
argm: 
                    往往 
                
argm: 
                    *PRO* 每 到 雨季