●推测过去可能发生某事 (同can, 但can不用肯定句)
She could have gone off with some friends.
●表示过去没有实现的可能性:某事可能发生,但却没有发生
You were stupid to go skiing there----you could have broken your leg.
●表示有能力做而未做(虚拟语气)
You could have helped me !
(You were able to help me, but you didnt.)
2、can could be able to 表示能力
●can 通常表示现在的或一般的能力---即你无论什么时候想做就能
做到的能力, 指单纯的表示一个人有某种能力。
You can certainly cook, even if you cant do anything else.
●be able to表示某人通过努力、克服困难做成某事。
will be able to 表示将来的能力
Ill be able to speak German in another few months.
●could 表达 一般的能力---即你过去想干什么就可以干什么
She could sing like an angel when she was a kid.
但could 不能表达过去某种具体的能力,此时用was able to, managed to 或 succeeded in 等
How many eggs were you able to get ?
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