不定过去 (不定過去) bùdìng guòqu
          
              bùdìng guòqu 
              
              adjective 
              aorist 
              Domain: Modern Chinese 现代汉语
              
                , Subdomain: Grammar 
              
              
                , Concept:  
              
              
              
                Notes: Expresses the perfective aspect and usually refers to past events