核心问题
请问 know of 与 know 有无区别?
词典解答
know 可作“认识”“知道”解：
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I know your brother but not your sister. (ELD) 我认识你的弟弟,但不认识你的妹妹。
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We've known each other eight years. 我们相识已有八年了。
而 know of 则作“听说过”“略知”解(If you know of something or know about it, you have heard about it.)。
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Do you know Mr Morrison? No, but I know of him. 你认识莫里森先生吗？不认识，但是我听说过他。
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I know of Mr. Edward McCrath, of course. But I don't know him. 我当然听说过爱德华·麦克拉斯先生，但是我不认识他。
know sb. to do sth.