Can≠be able to的情况

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can和be able to都表示“能力”,有“能”或“会”之意,在表示现在或过去的能力时,两者可以互换。如:He can(is able to)singa and dance.他能唱会跳。但它们并不是任何时候都可以互换。现就其不能互换的情况简述如下:
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