Be able to
Be able to与can(或者过去时的could)含义相近:
I'm not able to move my leg = I can't move my leg. 我的腿动不了了。
然而,can主要表达一种随着时间流逝可以获得的能力或技能,而be able to更偏向于临时状况或者描述能力或没有能力:
He can't swim, he has never learned how.他不会游泳,他一直就没学会怎么游。
He's not able to swim, the swimming pool is closed today.他不能去游泳,因为今天游泳池关闭了。
He's not able to swim, the swimming pool is closed today.他不能去游泳,因为今天游泳池关闭了。
Be able to 也可以用来表达在过去和将来时态内的can:
I was able to get to the meeting on time, despite the fact that the metro was late. 即使发生了地铁晚点的这件事,我还是准时到达开会现场了。
You'll be able to use your arm by the end of the month. 这个月末的时候,你的胳膊就能用了。
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