[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。

　　beautiful

　　[误] He is a beautiful boy.

　　[正] He is a handsome boy.

　　[析] 我们可以讲She is a beautiful girl. This is a beautiful park. 但要讲男人的"英俊"时要用handsome.

　　because

　　[误] The reason why I was late is because I was ill.

　　[正] The reason why I was late is that I was ill.

　　[误] Because it was Sunday, so the park was crowded.

　　[正] Because it was Sunday the park was crowded.

　　[析] 这种错误是因为中文的习惯与英语的表述法不同，中文常讲我来晚了的原因是因为我病了，而英文中的第二个因为要用that代替。又因中文常讲因为……所以……，而英文中用了因为就不能再用所以了，同样用了"所以"也就不要再用"因为"一词。例如：Because we study hard, we passed the exam easily. 或者：We study hard so we passed the exam easily.

　　because、because of

　　because后要接从句，例如：We like physics because we can learn a lot of new ideas. 而because of后要接名词作介词宾语，如：He is not at school because of the illness.

　　before

　　[误] We have two hours to kill before we will go home.

　　[正] We have two hours to kill before we go home.

　　[析] kill time意为"消磨时光"。

　　英语状语从句中要用一般现在时表示将来的动作。如：If it rains we will not go to the park.

　　[误] I did this work two days before.

　　[正] I did this work two days ago.

　　[析] 用ago组成的时间状语其主句中的谓语动词要用过去时，而before引起的时间状语其主句中的谓语动词多用完成时，如：I has done this work a few days before.

　　before long、long before

　　before long是"不久"之意，例如：I shall go to America before long. 而long before则是"很久很久"之意，如：We knew this teacher long before we saw him. (我们在看到这位老师之前很久就知道他了。)