1.—— I saw Mary in the library yesterday.
—— You can’t have seen her. She’s been abroad.
2. —— Do you know where David is? I couldn’t find him anywhere.
——Well, he can’t have gone far. His coat is still there.
三、 “can+have+done”表示对过去行为的怀疑,用于疑问句,译成“可能做过……吗?”。
1. There is no light in the room. Can they have gone out?
屋里没有灯,他们可能出去了吗?
2. There is nowhere to find them. Where can they have gone?
到处找不到他们,他们可能到什么地方去呢?
四、 “could+have+done”是虚拟语气,表示对过去事情的假设,意思是本来能够做某事而没有做。
1. Thank you for all your hard work last week. We don’t think we could have managed it without you.
2. Given more attention, the trees could have grown better.
五、 “may+have+done”表示对发生过的事情的推测,意思是“可能已经”或“也许已经”,用于肯定句中。
— What has happened to George?
— I don't know. He may have got lost.
六、 “might+have+done”表示对过去事情的推测,might与may意思相同,但可能性更小。多用于虚拟语气结构中。
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