(IP 
  (NP-SBJ 
    (CP 
      (WHNP-1 
        (-NONE- *OP*))
                    
      (CP 
        (IP 
          (NP-SBJ 
            (-NONE- *pro*))
                    
          (VP 
            (ADVP 
              (AD 唯一))
                    
            (VP 
              (VV 牵念不下)
                    
              (NP-OBJ 
                (-NONE- *T*-1)))))
                    
        (DEC 的))))
                    
  (PU ，)
                    
  (VP 
    (ADVP 
      (AD 竟))
                    
    (VP 
      (VC 是)
                    
      (NP-PRD 
        (CP 
          (WHNP-2 
            (-NONE- *OP*))
                    
          (CP 
            (IP 
              (NP-SBJ 
                (-NONE- *T*-2))
                    
              (VP 
                (VP 
                  (IP-ADV 
                    (NP-SBJ 
                      (NN 年))
                    
                    (VP 
                      (VV 过)
                    
                      (QP-OBJ 
                        (CD 三十))))
                    
                  (ADVP 
                    (AD 仍))
                    
                  (VP 
                    (VV 小姑独处)))
                    
                (PU 、)
                    
                (VP 
                  (ADVP 
                    (AD 只身))
                    
                  (PP-LOC 
                    (P 在)
                    
                    (NP-PN 
                      (NR 台北)))
                    
                  (VP 
                    (VV 打拚)))))
                    
            (DEC 的)))
                    
        (NP 
          (NN 二孙女))))))
arg0: 
                    *pro* 
                
arg1: 
                    *T*-1 
                
argm: 
                    唯一