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      had done的用法總結
      
            
            
      回答
      
            
      
                
                瑞文問答
                
      2024-08-19
            
      
            
      
                could have done可以表示“過去本來能夠做某事而實際上沒有做”。如：
      I could have come here a little earlier, but Im late because of the bad traffic.
      must have done表示對過去已經發(fā)生過的情況的肯定推測，語氣較強。
            
      
            
            
      擴展資料
      
            
      　　may / might have done表示對已經發(fā)生過的情況的肯定推測，語氣稍弱。might have done還可表示“本可能做某事而實際上沒有做”。如：
      had done的用法總結
      　　She didn''t come on time. She may / might have missed the bus.
      　　He might have given you more help, but he was very busy then.
      　　should / ought to have done表示“本該做某事而實際上沒有做”，其否定形式表示“本不該做某事而實際上做了”，通常含有責備的意思。如：
      　　The flowers have died. I should / ought to have watered them often.
      　　You shouldn''t / ought not to have told them the truth.