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[误] Im sorry. I have to back home. [正] Im sorry. I have to go back home. [正] Im 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。 | 
