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keep [误] She was keeping something to her father. [正] She was keeping something from her father. [析] 对某人隐瞒某事要用keep something from somebody句型。 [误] He kept to repeat the word again and again. [正] He kept repeating the word again and again. [析] keep doing something为连续不断地做某事。有时可以与keep on doing something互换。它们的区别在于keep doing something意为该动作一直不停地在进行中，如： When the train started, she kept waving her hand. 而keep on doing something则表示该动作可能停停顿顿但却一直在进行中，如： He kept on making the same mistakes in grammar. [误] We must keep up the times. [正] We must keep up with the times. [析] 这句话意为我们必须赶上时代，keep up with是赶上之意，而keep up则是坚持下去的意思，如： Keep it up, dont stop now! key [误] I lost the key of the door. [正] I lost the key to the door. [析] 英语中讲某某的东西一般要用of，而key, entrance, answer则多用to，如：门的钥匙为key to the door, 高速公路入口为entrance to the highway, 问题的答案为the answer (key) to the question. | 
