can/could和be able to在这两个句子里的区别,为什么不能替换为什么 after a lot of studying,he was able to pass the exam 和 despite the bad weather,the climber were able to reach the top by noon这两个句子里的be able to不能

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can/could和be able to在这两个句子里的区别,为什么不能替换为什么 after a lot of studying,he was able to pass the exam 和 despite the bad weather,the climber were able to reach the top by noon这两个句子里的be able to不能
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can/could和be able to在这两个句子里的区别,为什么不能替换为什么 after a lot of studying,he was able to pass the exam 和 despite the bad weather,the climber were able to reach the top by noon这两个句子里的be able to不能
can/could和be able to在这两个句子里的区别,为什么不能替换
为什么 after a lot of studying,he was able to pass the exam 和 despite the bad weather,the climber were able to reach the top by noon这两个句子里的be able to不能换成could?

can/could和be able to在这两个句子里的区别,为什么不能替换为什么 after a lot of studying,he was able to pass the exam 和 despite the bad weather,the climber were able to reach the top by noon这两个句子里的be able to不能
could表示一种委婉的语气,除了作为can的过去时,它的应用一般都在疑问句中,请求帮助.Could you help me?
一般都是在can和be able to之间摇摆,大部分时候这两个可以互换.
但是还是有一定区别的.
be able to表示一种能力 + 成功的完成一个动作”而且更加侧重强调后者,你可以理解为【我有能力做（具体的某件事）.】【我在我的能力范围之内.】
can泛指一般的能力,而且只有两种形式,即:can,could．
当涉及到具体要完成某件事,某个动作时就要用be able to了

be able to 主要强调时态

able to 是给“未来拥有的能力”
我学习了“然后”有通过的能力

可以， 都表示”能够，有能力“的意思。

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