Ⅰ.know表示认识的意思时，可以表示认识或熟悉某人，也可以只表示认识某人是谁(即认得某人是个什么样子)。它不仅可以用于人，还可以用于地方等。如：
① Do you know him? 你认识他吗?
② I have known him for more than ten years. 我认识他有十多年某人 knowple go theret?ldren were mercilessly sl moon.了。
③ I know him by sight but have never spoken to him. 我认识他是谁，但从没有和他谈过话。
④ He knows the city thotoughly. 他很熟悉那个城市。
Ⅱ. recognize表示认识的意思时，表示能认出曾经见过或原来认识的人或物。如：
① Do you recognize him? 你认得他是谁吗?
② I did not recognize him at once. 我一下子都认不得他了。
③ When he came back to Nanjing, he hardly recognized the city. 当他回到南京时，他几乎认不得这个城市了。