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 ?
3、can, could, may和might 表示可能性
可用来表示:①理论上的可能性(不涉及是否真发生);②提出建议
(提出解决某个问题的可能办法或者采取的行动);③在问句或否定句中表达现在的可能性)
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