Some children aren't able to speak before they are two years

Some children aren't able to speak before they are two years old.
上面的为什么不能用can't 而要用 aren't able to .不是说can表示自身能力的吗?

缔尚朱瑜 1年前已收到1个回答举报

幽浮传春芽

共回答了8个问题采纳率：100% 举报

can表示的是一种主观能动性,自己能控制的,而be able to 是由客观条件所决定的.

1年前追问

缔尚朱瑜举报

只要是人身上的技能都用can吗？例如，我学了很久才学会唱歌。

举报幽浮传

应该是这样的，I can do something. 但有时也可用其它说法。比如说一件事你可以通过自己的努力学会或者是完成就可以用can，这就是主观能动性。

缔尚朱瑜举报

但书上说努力而成的能力要用 be able to 啊。。算了。不纠结了。。

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你能帮帮他们吗

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