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Ⅰ. know “知道”;“了解”。侧重直接性。如： ① I know her very well. 我很了解她。 ② I don’t know his current address. 我不知道他目前的地址。 Ⅱ. know about “知道知道关于……的情况”。 ① I happened to know about him. 我碰巧了解他的情况。 ② I don’t know about that matter. 我不知道那件事。 Ⅲ. know of “知道有……”;“听说过……”，侧重间接性。 ① I know of the town but I’ve never been there. 我知道有那么个镇子，但从未去过那里。 ② I don’t know Mark, but I know of him. 我不认识马克，但我听说过他。 | 
