(IP 
  (ADVP 
    (AD 而))
                    
  (NP-SBJ 
    (CP 
      (WHNP-1 
        (-NONE- *OP*))
                    
      (CP 
        (IP 
          (NP-SBJ 
            (-NONE- *T*-1))
                    
          (VP 
            (VP 
              (NP-ADV 
                (NN 晨))
                    
              (VP 
                (VV 起)))
                    
            (VP 
              (VV 赶路))))
                    
        (DEC 的)))
                    
    (NP 
      (NN 商旅)))
                    
  (PU ，)
                    
  (VP 
    (ADVP 
      (AD 却))
                    
    (ADVP 
      (AD 已))
                    
    (VP 
      (VP 
        (PP-LOC 
          (P 在)
                    
          (LCP 
            (NP 
              (NN 市街))
                    
            (LC 上)))
                    
        (VP 
          (VV 吃)
                    
          (AS 著)
                    
          (NP-OBJ 
            (CP 
              (WHNP-2 
                (-NONE- *OP*))
                    
              (CP 
                (IP 
                  (NP-SBJ 
                    (-NONE- *T*-2))
                    
                  (VP 
                    (VV 热腾腾)))
                    
                (DEC 的)))
                    
            (NP 
              (NN 包子)))))
                    
      (PU ，)
                    
      (VP 
        (VV 准备)
                    
        (IP-OBJ 
          (NP-SBJ 
            (-NONE- *PRO*))
                    
          (VP 
            (VV 离开)
                    
            (NP-OBJ 
              (NN 京城)))))))
                    
  (SP 了))
arg0: 
                    *T*-1