(IP 
  (ADVP 
    (AD 但是))
                    
  (PU ，)
                    
  (NP-SBJ 
    (QP 
      (CD 许多))
                    
    (NP 
      (NN 兼并)))
                    
  (VP 
    (ADVP 
      (AD 明显))
                    
    (VP 
      (VC 是)
                    
      (NP-PRD 
        (CP 
          (WHNP-1 
            (-NONE- *OP*))
                    
          (CP 
            (IP 
              (NP-SBJ 
                (NN 公司))
                    
              (VP 
                (PP-PRP 
                  (P 为)
                    
                  (IP 
                    (NP-SBJ 
                      (-NONE- *PRO*))
                    
                    (VP 
                      (VRD 
                        (VV 生存)
                    
                        (VV 下去)))))
                    
                (VP 
                  (MSP 而)
                    
                  (VP 
                    (ADVP 
                      (AD 不得不))
                    
                    (VP 
                      (VV 采取)
                    
                      (NP-OBJ 
                        (-NONE- *T*-1)))))))
                    
            (DEC 的)))
                    
        (NP 
          (NN 行动))))))
arg0: 
                    *PRO*