作业帮be unable to do与be not able to do有什么区别
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be unable to do与be not able to do有什么区别
be unable to do与be not able to do有什么区别
be unable to do与be not able to do有什么区别
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.