[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。

[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 croded.

[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。)