1－1.用适当的情态动词填空

　　①I could not have been more than six years old when the accident happened.

　　②I have lost one of my gloves. I must have dropped it somewhere.

　　③We may not have proved great adventurers, but we have done the greatest march ever made in the past ten years.

　　④-Do you know where David is? I couldn't find him anywhere.

　　-Well. He can not have gone far - his coat's still here.

　　⑤He must have completed his work; otherwise, he couldn't be enjoying himself by the seaside.

　　1－2.完成句子

　　⑥史密斯先生不可能去北京了，我刚才还在图书馆见过他。

　　Mr. Smith can't have gone to Beijing，for I saw him in the library just now.

　　⑦昨晚一定下雨了，因为地面还是湿的。

　　It must have rained last night，for the ground is wet.

　　⑧到处找不到他们，他们可能到什么地方去呢？

　　There is nowhere to find them. Where can they have gone?

　　⑨如果你多给她点机会，她可能已经取得了更大的进步。

　　She might have achieved greater progress，if you had given her more chances.

　　⑩--乔治发生了什么事？

　　--我不知道，他可能迷路了。

　　-What has happened to George?

　　-I don't know. He may have got lost.

　　二、表示对过去发生之事的后悔、责备、遗憾等情绪

　　1．could＋have done本来能够做某事而没有做

　　 Mr. White could have passed the driving test at the first attempt, but he was too nervous.

　　怀特先生考汽车驾驶执照时本来可以一次就通过的，但是他太紧张了。

　　2．might have done 本可以做......，本应该做(而实际上未做)

　　Jane! I might have known you'd be behind all this!

　　简！我早该料到所有这一切都是你在幕后操纵。

　　3．should/ought to have done本该做某事(而实际未做)

　　shouldn't/oughtn't to have done本不该做某事(而实际上做了)

　　The flowers have died. I should have watered them often.

　　这些花都死了。我本来应该常给它们浇水的。

　　You ought not to have told them the truth.

　　你本不该告诉他们真相的。

　　4．needn't have done本来没必要做某事(而实际上做了)

　　I needn't have bought so much wine - only five people came.

　　我本来没有必要买这么多酒，只来了五个人。

　　集中演练2

　　2－1.用情态动词及所给词的适当形式填空

　　①Jack could have done (do) better, but he didn't try his best.

　　②You should/ought to have done (do) your homework last night, but you went to the cinema.

　　③We came too early. We needn't have hurried (hurry) so much.

　　④I'm sorry. I shouldn't/oughtn't to have shouted (shout) at you the other day.

　　⑤Father sent me the book, so I needn't have written (write) to him for it.

　　2－2.完成句子

　　⑥汤姆，你太懒惰了，这项工作本来应该昨天就做完的。

　　Tom，you are too lazy. The work should have been finished yesterday.

　　⑦他或许会多给你一些帮助，即使他很忙。

　　He might have given you more help，even though he was busy.

⑧看，汤姆哭了，我本来不应该对他如此严厉。