They might have taken a later train.也许他们乘坐的是晚一点儿的火车 。
He seems to know the city quite well. He may have been there before.他似乎对那个城市很熟悉，他以前可能去过那儿 。
2．表示“本来应该或可以做但没有做某事”，含有轻微的责备口吻或遗憾 。
You might have given him more help, though you were busy.你本来应该给他更多的帮助，虽然你很忙 。
The proposal might have been refused.这个建议本该拒绝的 。
B．cancould have done
1．表示对过去事实的推测，常用于否定句和疑问句 。
He can\'t couldn\'t have watched TV yesterday for he knew they would have an exam.昨天他不可能看电视，因为他知道快要考试了 。
I don\'t know why she didn\'t call me yesterday. Can (Could) she have forgotten my telephone number我不知道昨天她为什么没给我打电话，难道她会把我的电话号码忘了吗？
He didn\'t come to school yesterday. Can he have been ill他昨天没来学校，难道他生病了？
2．could可表示对过去能做而未做的事感到惋惜、遗憾，可译成“本来是可以……的” 。
Why didn\'t Sophie apply for the job She could have got it.为什么索菲不申请这项工作？她本来是能得到的 。
Why did you stay at a hotel when you went to New York You could have stayed with Barbara. 你到纽约时为什么住宾馆？你完全可以和芭芭拉住在一起的 。
Given more time, we could have done the work better.如果给我们更多的时间，我们完全可以把这项工作干得更好 。
C．must have done
1．表示对过去事实有把握的推测，具有较大的可能性 。只用于肯定句中，否定句和疑问句用cancould have done 。
His watch must have stopped.他的表肯定停了 。
--- I rang your flat yesterday. A man answered but I didn\'t recognize the voice.昨天我给你家打电话，一位男士接了电话，但我没听出来是谁的声音 。
--- Oh, it must have been my brother Peter. 哦，那一定是我哥哥彼得 。
2．用于虚拟语气中时，表示与过去事实相反 。
You must have caught the bus if you had got up earlier. 如果你早一点儿起床的话，你准能赶上那一班公共汽车了 。（事实上没有赶上公共汽车）
He must have won the game if he had been careful enough.如果他足够细心的话，他准能赢得比赛 。.
D．needn\'t have done
用于对过去的责备，表示“没有必要做某事，可是做了” 。
The airport is close to us. You needn\'t have hurried there early.机场离这儿很近，你没必要早早地赶到那里 。（可是你早早地到那儿了）
He is still young. You needn\'t have sent him such an expensive present.他还小，你没必要送他这么昂贵的礼物 。
注意：
如表示“过去不必做也没有做”之意，需用didn\'t need to do 。
It is not cold today. I didn\'t need to take the thick sweaters out.今天天气不冷，我没有必要把厚毛衣拿出来 。（实际上也没拿）
E．shouldought to have done
1．表示对过去动作的责备或批评 。
You should have gone over your lessons. (In fact you didn\'t go over your lessons.)你们应把功课复习好的 。（可事实上你们没有 。）
You shouldn\'t have watched TV last night. (In fact you watched TV last night.)你们昨天晚上本不该看电视 。（可你们看了 。）
You oughtn\'t to have entered the teachers\' office without permission.没有经过允许，你们本不该进老师的办公室 。
You oughtn\'t to have gone to the deserted place alone. 你不该独自去那荒凉之地 。
2．表示期待或推测 。
If the flight was on time, you should ought to have arrived in Shanghai early this morning.如果航班准点的话，你今早就能到上海了 。

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