be able to 与 can的区别：为什么不能说：All the people could escape from the big fire in time.只能说：All the people were able to escape from the fire in time.

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be able to 与 can的区别：为什么不能说：All the people could escape from the big fire in time.只能说：All the people were able to escape from the fire in time.
be able to 与 can的区别：为什么不能说：All the people could escape from the big fire in time.只能说：All the people were able to escape from the fire in time.

be able to 与 can的区别：为什么不能说：All the people could escape from the big fire in time.只能说：All the people were able to escape from the fire in time.
be able to 与can用法与区别
(1) be able to 强调努力而的能力,而can则强调自身已的能力.如：
She can sing the song in English.她能用英语唱这首歌.
He will be able to sing this song in English in a few minutes,too.几小时之后,他也能用英语唱这首歌.
(2) be able to 强调结果,而can只强调.如：
Luckily,he was able to escape from the big fire in the end.幸运的是,他终于逃出了大火.
If he got here a few hours earlier,I could save him.要是他早几小时来,我还能救他.
(3) be able to 可以有时态；而can现在和两种时态.如：
I could help you last night,but you didn’t come.昨天晚上我能帮你,而你又没来.
Can you see it there?你能看见它在那儿吗?
He is / was / will be able to help you.他能帮你的忙(from www.hxen.com).
(4) can可用于表示性,推测,允许等情况,而be able to通常不

be able to主要是强调有能力做某事，而can主要是表示可以，没有“有能力”之意

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