情态动词--情态动词 have 过去分词
文章作者 100test 发表时间 2008:03:13 14:47:37
来源 100Test.Com百考试题网
1) may(might) have done sth, can (could) have done sth 表示过去,推测过去时间里可能发生的事情。例如:
Philip may (might) have been hurt seriously in the car accident. 菲力浦可能在车祸中受了重伤。
Philip can (could) have been hurt seriously in the car accident.
2) must have done sth,对过去时间里可能发生的事情的推测,语气较强,具有"肯定","谅必"的意思。例如:
——Linda has gone to work, but her bicycle is still here. 琳达已经去上班了,但她的单车还在这儿。
——She must have gone by bus.肯定乘巴士去的。
3) ought to have done sth, should have done sth表示本应该做某事,而事实上并没有做。否定句表示"不该做某事而做了".例如:
You ought to (should) have been more careful in this experiment. 你当时在做试验时应该更仔细点。
He ought not to have thrown the old clothes away.他不该把旧衣服扔了。(事实上已扔了。)
ought to 在语气上比should 要强。
4) needn t have done sth表示本没必要做某事,但做了。例如:
I dressed very warmly for the trip, but I needn t have done so. The weather was hot.
旅行时,我衣服穿得较多,其实没有必要。那时天很热。
5) would like to have done sth表示本打算做某事,但没做。例如:
I would like to have read the article, but I was very busy then. 我想读这篇文章,但太忙了一直没读。