know过去式是knew，过去分词是known。例句：I don't know the name of the place.我不知道那个地方的名字。

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know过去式是knew，过去分词是known。例句：I don't know the name of the place.我不知道那个地方的名字。Gifford was a friend. I'd known him for nine years.吉福德是我的一位朋友。我和他认识9年了。