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for与because都可以用来表示“因为”，但它们在实际应用中却有着不少区别。下面就让我们一起看看它们之间究竟存在着哪些区别。
because是从属连词，可以直接回答why提出的问题，而for 是并列连词，它引导的分句有时只是对前一分句补充说明理由或推断原因，不能回答why引出的问题。例如：
——Why didn't he come to the lecture yester-day?
——Because he was ill.
——Why do you often listen to BBC English programmes on the radio?
——Because I want to improve my English.
如果将上面两句中的because改为for，句子就成了错句。
for 引导的分句不宜放在另一个分句的前面，for 要位于两个分句的中间，而且for前面要用逗号隔开。但是because引导的从句则比较灵活，既可以位于主句之前也可以位于主句之后。例如：
Because he was too tired,he stopped to have a rest.
He didn't buy the dictionary because it was too expensive.
I decided to stop and have lunch,for I was feeling quitehungry.
They had often heard of elephants,but they had never seenone,for being blind,how could they?
但是我们有时也会看到for见于句首， 这时它是用来把整句与前一句相连。例如在Quirk的《当代英语语法》中就有这样的一个句子：
The men's and the women's shops are indistinguish - ablefrom each other.For the girls' shop windows display masculineshirts,while the men's windows are
full
of
scarletminiunderpants.男人用品商店和妇女用品商店无法分辨。 因为妇女用品商店的橱窗里摆设着男式衬衣，而男子用品商店的橱窗里放满了鲜艳的内裤。
我们再来看另外一个例句：
The leaders of the strike,two communists,laid down theirlives for the cause.But the strikers went on fight- ing.Forthe Communist Party had come on the scene and that changedthe whole course of China's history.两位领导这次罢工的共产党员为革命献出了生命，但是工人们继续进行斗争，因为中国共产党已经诞生，这就改变了中国历史的整个过程。
表示不是必然性推论的分句必须用for 而不是用because来引导。例如：
It will rain,for the barometer is falling.天会下雨，因为气压计在下降。（气压计下降预示可能下雨，但并非必然下雨。）
It must be morning,for the birds are singing.鸟在歌唱， 该是早晨了。（鸟会在早晨歌唱，但鸟歌唱还有其它原因。）
for除了表示非必然性推论外， 也可以表示必然性推论或者直接因果关系。这时for与because相同，二者可以互换。例如：
He must have passed this way,for/because his footprintsare here.
We hurried home,for/because it was getting dark.
He hid himself in the woods,for/because he was afraid.
我们不妨再来比较下面的句子：
It must have rained last night,for the ground is wet.昨晚一定下过雨，因为地湿。
这个句子中的for不能改为because，因为for在这里表示的是非必然性的推论。我们知道，下雨地会湿，但是地湿并非都是下雨造成的。
但是我们可以说：
The ground is wet,for/because it rained last night.
这个句子中用for或because都是可以的，因为昨天晚上下雨是现在地湿的直接原因。
在强调句型中，被强调的原因状语从句必须要用because 而不能用for来加以引导。例如：
It was because he was too careless that he failed in thephysics examination.
It is because he often does good deeds for his class thathe is liked by all his classmates.
下面的句子则是错的：
It was for he was seriously ill that Mr Li did not attendthe meeting yesterday.
因为for是并列连词，它前面不能用副词加以修饰，而because是从属连词，它引出的从句相当于一个状语，所以它前面可以受某些副词修饰，如only,simply,just等，例如：
You shouldn't get angry just because some people speakill of you.
He came here only because he want-ed to have a talk withour chief engineer.
Katherine said that she liked my cousin simply because hewas honest.
同样，在not...because （“不要因……而”或“不是由于……而”）以及not be-cause...but because...（“不是因为……而是因为……”）的结构中，because也不可以换成for。
He did not leave home because he was afraid of his father.他并不是因为害怕父亲而离家出走的。
He stayed in the cave all day long,not because he wasafraid,but because he was too tired.
They tried every affort to collect money for the wildlifeproject,not because they wanted to show off themselves,butbe-cause they tried to do something for wild animals.
由于for是并列连词，它前面也就不能再用and之类的并列连词。但是because属于从属连词则不受此限制， 当一个句子中有两个由because引导的原因状语从句时，它们之间就可以用and连接起来。例如：
The couple decided to settle down in the country,becausethey were tired of the noise in the city life and becausethey wanted to get more fresh air.
此外，because可以用来引导名词性从句，如表语从句等，for则没有这一功能。请看下面的句子：
Every year,tobacco companies must persuade new people tostart smoking cigarettes.This is because each year mil- lionsof smokers die from the habit.
He failed in the experiment.It was because he did notfollow the professor's advice.