(2)could have done用于肯定句,则表示“本来能够做到却没有做到”,此时 could不能换成 can。
①It seems that he is unhappy. He must have been told the bad news.
看起来他不高兴,他一定已被告知这个坏消息了。
②He could have caught the early bus, but his bike broke down on the way.
他本能够赶上那辆早班车,但是他的自行车在路上坏了。
【例句研读】
He couldn't have gone abroad.I saw him just now.他不可能已经出国了。我刚才还看见他了。
We knew he couldn't have paid for it,because he had no money.
我们知道不可能是他付了这笔钱,因为他没钱。
Tom could have taken the money.He was here alone yesterday.
有可能是汤姆把钱拿走了,昨天他单独一个人在这里呆过。
He could have passed the exam,but he was too careless.他本来能通过考试的,但是他太粗心了。
【考点聚焦】情态动词+完成式表对过去事实的推测
【即时巩固】
(1)I ______have been more than six years old when the accident happened.
A.shouldn‘tB.couldn't
C.mustn't
D.needn't
(2)He paid for a seat, when he ______ have entered free.
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