Philip can/could/may/might have been hurt seriously in the car accident.
菲利普在車禍中可能/也許受了嚴重的傷。
2. must have +done sth，對過去時間里可能發(fā)生過的事情的推測，語氣較強，意為”肯定/一定做過某事“。
?Linda has gone to work, but her bicycle is still here.
琳達已經(jīng)去上班了，但是她的自行車還在這里。
?She must have gone by bus.
她一定是乘公交車去的。
3. should/ought to 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.
你在試驗中本應該更小心的。(實際上沒有)
He ought not to have thrown the old clothes away.
他本不該扔掉舊衣服的。(實際上扔了)
注意：ought to 在語氣上比should 要強。
4. needn't have done sth，本沒必要做某事卻做了。
I dressed very warmly for the trip, but I needn't have done so. The weather was hot.
我為了這次旅行穿得很暖和。但是我本沒必要這樣做的，天氣很熱。
5. would like to have done sth，過去本想做某事而沒做。
I would like to have read the article, but I was very busy then.
我本想閱讀這篇文章的，但是那個時候我太忙了。
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