通用就业能力测试 epi:Not all kinds of viruses are able to be removed。“be able to”是什么意思？

来源：百度文库 编辑：高校问答 时间：2024/04/28 13:01:14

不是所有的病毒都能被清除。
能，=can

可以，能

能
相当于can

be able to
v.
能, 会

be able to基本上和can是一个意思，但也有不同。
can 和be able to 都可以表示能力.can泛指一般的能力,而且只有两种形式,即:can, could．be able to 则主要指具体做到了某件事的能力，其形式主要是靠be 发生变化，所以形式比can 多．可以说：I can swim. I am able to swim. 但是不能说：All the people could escape from the big fire in time. 只能说：All the people were able to escape from the fire in time.
另外，be able to用于过去时（即was able to或were able to）的时候，表示已经做到了某事。

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