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(jīng)發(fā)生過的情況的肯定推測，語氣較強(qiáng)。">

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had done的用法總結(jié)

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(jīng)發(fā)生過的情況的肯定推測，語氣較強(qiáng)。

擴(kuò)展資料

　　may / might have done表示對已經(jīng)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(jié)

　　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(zé)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.