A 这种结构表示过去的能力,表示动作并未付诸实施:
I could have lent you the money.Why didnt you ask me?
我那时是能借钱给你的。你为什么没有向我借?
或用于表示不知道行动是否已付诸实施的场合:
The money has disappeared!Who could have taken it?
钱不见了!谁会把它拿走呢?
Tom could have(taken it);he was here alone yesterday.
有可能是汤姆把它拿走的;昨天他单独一个人在这里呆过。
比较以下两句:
He was able to sent a message.
他设法送了个信来。(他送了。)
He could have sent a message.
他本可以送个信来。(他没有送,或者我们不知道他是否送过。)
B could+完成式可表示因别人没做某事感到不满或责备:
You could have told me.
你本来可以告诉我的。相当于:
I am annoyed/disappointed that you didnt tell me.You should have told me.
你没告诉我,我感到不高兴/失望。你本来应该告诉我的。
说话的人要对自己希望强调的词重读。
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