(NP-TMP 
  (CP 
    (WHPP-2 
      (-NONE- *OP*))
                    
    (IP 
      (NP-SBJ-1 
        (-NONE- *pro*))
                    
      (VP 
        (PP-TMP 
          (-NONE- *T*-2))
                    
        (VP 
          (LB 被)
                    
          (IP-OBJ 
            (NP-SBJ 
              (NN 人))
                    
            (VP 
              (VV 发现)
                    
              (NP-OBJ 
                (-NONE- *-1))))))))
                    
  (NP 
    (NN 时候)))
                    
(NP-SBJ 
  (-NONE- *pro*))
                    
(VP 
  (VV 仰躺)
                    
  (PP 
    (P 在)
                    
    (NP 
      (NN 地上)))))
argm: 
                    被 人 发现 时候          
                
arg0: 
                    *pro*          
                
arg1: 
                    在 地上