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back ? ［误］ I'm sorry. I have to back home.? ［正］ I'm sorry. I have to go back home.? ［正］ I'm sorry. I have to go home.? ［析］ back用作“回到（某处）”之意，不是动词。? be ? ［误］ Where do you from？? ［正］ Where are you from？? ［析］ “你从何处来”应为Where are you from？或Where do you come from？ 但要注意这两句话均是问对方从哪个国家来的。要是口语中问“你是从什么地方来？”应讲Where did you come from？回答用I came from the library.? beat ? ［误］ We have won your class.? ［正］ We have beaten your class.? ［正］ We have won the game.? ［析］ win是胜过之意，它是及物动词，但其后的宾语只能接比赛、战争、奖品、奖金的名称，如：Which team won the football match？ 而beat指打败对手、敌人……如：My brother beat me at poker.（要注意的是，beat的过去式与原形相同，而过去分词为beaten）。? ［误］ The ball beat me badly.? ［正］ The ball hit me badly.? ［误］ He used to hit the little boy black and blue.? ［正］ He used to beat the little boy black and blue.? ［析］ beat指打击多次，而hit则为击中对方的一次性打击。? | 
