(IP 
  (NP-SBJ 
    (CP 
      (WHNP-4 
        (-NONE- *OP*))
                    
      (CP 
        (IP 
          (NP-SBJ 
            (-NONE- *T*-4))
                    
          (VP 
            (VA 忧)))
                    
        (DEC 的))))
                    
  (VP 
    (VC 是)
                    
    (IP-PRD 
      (IP 
        (NP-SBJ 
          (NN 贸易)
                    
          (NN 顺差额))
                    
        (VP 
          (ADVP 
            (AD 急剧))
                    
          (VP 
            (VV 回落))))
                    
      (PU ，)
                    
      (IP 
        (NP-SBJ 
          (-NONE- *pro*))
                    
        (VP 
          (NP-TMP 
            (NT 今年))
                    
          (VP 
            (VV 可能)
                    
            (VP 
              (VV 出现)
                    
              (NP-OBJ 
                (CP 
                  (WHNP-5 
                    (-NONE- *OP*))
                    
                  (CP 
                    (IP 
                      (NP-SBJ 
                        (-NONE- *T*-5))
                    
                      (VP 
                        (ADVP 
                          (AD 较))
                    
                        (VP 
                          (VA 大))))
                    
                    (DEC 的)))
                    
                (NP 
                  (NN 逆差))))))))))
arg0: 
                    *T*-4