· 2007年6月四、六級考試成
· 2007年6月英語四級考試A
· 2007年6月23日大學英語六
· 2007年6月23日英語六級聽
· 2007年6月23日四六級考試
· 2007年6月23日英語四六級
· 2007年6月大學英語四級A
1) may(might) have + done sth, can (could) have + done sth
表示過去，推測過去時間里可能發生的事情。
Philip may (might) have been hurt seriously in the car accident.
Philip can (could) have been hurt seriously in the car accident.
2) must have +done sth
對過去時間里可能發生的事情的推測，語氣較強，具有"肯定"，"諒必"的意思。
---Linda has gone to work, but her bicycle is still here.
---She must have gone by bus.
3) ought to have done sth, should have done sth
本應該做某事，而事實上并沒有做。否定句表示"不該做某事而做了"。
You ought to (should) have been more careful in this experiment.
He ought not to have thrown the old clothes away.（事實上已扔了。）
ought to 在語氣上比should 要強。
4) needn't have done sth 本沒必要做某事
I dressed very warmly for the trip, but I needn't have done so. The weather was hot.
5) would like to have done sth 本打算做某事
I would like to have read the article, but I was very busy then.
，我們將會及時處理。如轉載本網內容，請注明出處。