Philip can/could/may/might have been hurt seriously in the car accident.
菲利普在车祸中可能/也许受了严重的伤。
2. must have +done sth，对过去时间里可能发生过的事情的推测，语气较强，意为”肯定/一定做过某事“。
?Linda has gone to work, but her bicycle is still here.
琳达已经去上班了，但是她的自行车还在这里。
?She must have gone by bus.
她一定是乘公交车去的。
3. should/ought to have done sth，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"。
You ought to/should have been more careful in this experiment.
你在试验中本应该更小心的。(实际上没有)
He ought not to have thrown the old clothes away.
他本不该扔掉旧衣服的。(实际上扔了)
注意：ought to 在语气上比should 要强。
4. needn't have done sth，本没必要做某事却做了。
I dressed very warmly for the trip, but I needn't have done so. The weather was hot.
我为了这次旅行穿得很暖和。但是我本没必要这样做的，天气很热。
5. would like to have done sth，过去本想做某事而没做。
I would like to have read the article, but I was very busy then.
我本想阅读这篇文章的，但是那个时候我太忙了。
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