如题所述
两者语义没有区别,但感觉“be unable to”表达否定意思比较自然一点.而“be able to”就专门用于肯定意思好了.
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第1个回答 2013-11-12
I'm not able to answer this question.
I am unable to answer this question.
语义没有区别,但感觉“be unable to”表达否定意思比较自然一点。而“be able to”就专门用于肯定意思好了。本回答被网友采纳
I am unable to answer this question.
语义没有区别,但感觉“be unable to”表达否定意思比较自然一点。而“be able to”就专门用于肯定意思好了。本回答被网友采纳
第2个回答 2013-11-12
其实是没有什么区别的,。只是有时按场景不同时来用.
第3个回答 2013-11-12
be unable to do sth. "不能做某事",可以用be not able to do sth.替换.
He is unable to walk. = He isn't able to walk.
他不能走路.
或He can't walk.
He is unable to walk. = He isn't able to walk.
他不能走路.
或He can't walk.