becausebecause
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CONJ-SUBORD （说明原因）因为，由于
You use because when stating the reason for something.He is called Mitch, because his name is Mitchell...
人们叫他米奇，因为他大名叫米切尔。
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CONJ-SUBORD （作出解释）因为
You use because when stating the explanation for a statement you have just made.Maybe they just didn't want to ask too many questions, because they rented us a room without even asking to see our papers...
也许他们只是懒得问太多的问题，因为他们都没要求看我们的证件就把一个房间租给我们了。
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PREP-PHRASE 因为；由于
If an event or situation occurs because of something, that thing is the reason or cause.Many families break up because of a lack of money...
许多家庭由于缺钱而破裂。
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PHR-CONJ-SUBORD 仅仅因为
You use just because when you want to say that a particular situation should not necessarily make you come to a particular conclusion.Just because it has a good tune does not mean it is great music...
仅凭旋律优美并不见得就是一首杰出的音乐作品。
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because, as, since 或者 for 都可以用来给出解释。because 最常用，用来回答以 why 开头的疑问句。as 或 since 可以代替 because 引导原因从句，尤其是在书面语中：a note about The National Portrait Gallery, as the word ‘Gallery’ can be misleading（对 The National Portrait Gallery 的注释，因为 Gallery 一词容易令人误解），Since the juice is quite strong, you should always dilute it（这种果汁太浓，所以必须加以稀释）。在故事中，for有时用于解释或论证：He seemed to be in need of company, for he suddenly went back into the house（他看起来需要陪伴，因为他突然回到了屋里）。注意，because 是连词，用来连接一个句子中的两个观点：I'm unsocial, because of my deafness（我耳朵聋，所以不善交际）。
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They are here because of us .
他们是因为我们来这里的。
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We couldn 't understand them because they were talking in Chinese .
我们听不懂他们在讲些什么，因为他们说的是汉语。
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His school work is suffering because of family problems .
由于家庭问题，他的学业日渐退步。
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Two players are out of the team because of injury .
两名队员因伤退出了比赛。
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Why get upset just because you got one bad grade ?
何必因为一次成绩不好就想不开呢？
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No payments were made last week because of a computer error .
由于计算机出错，上周未付任何款项。
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She found it difficult to make friends because of her natural reserve .
她因天性矜持很难交到朋友。
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Life was harder then because neither of us had a job .
那时生活比较艰苦，因为我俩都没有工作。
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The game was called off because of bad weather .
比赛因天气恶劣被取消。
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Because of his wife being there , I said nothing about it .
他的妻子在场，我便没提及这事。
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The party went well because everyone entered into the spirit of things .
晚会很成功，因为每个人都很投入。
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She 's been dropped from the team because of injury .
她因受伤而未被列入队员名单。
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Because of the cold weather the crops are later this year .
因天气寒冷，农作物今年成熟得晚。
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Some families go without medical treatment because of their inability to pay .
有些家庭因无力支付医疗费用而得不到医治。
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Our plans fell through because of lack of money .
我们的计划由于缺钱而落空了。
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Nothing will be done because no one in authority takes the matter seriously .
什么也办不了，因为掌权的谁也不认真对待这个问题。
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The project has been cancelled because of lack of funds .
这个项目因缺乏资金已经撤销。
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She was treated like a freak because she didn 't want children .
她因为不要孩子而被当作怪人。
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We have had to raise our prices because of rising costs .
因为成本日益上涨，我们不得不提高价格。
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No new power stations have been built , principally because of the cost .
没有新建的发电站，主要是因为经费问题。
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I did it because he told me to .
是他吩咐我才做的。
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The team has made some positional changes because two players are injured .
因有两名队员受伤，这个队将队员做了些位置上的调整。
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She could only nod , because her mouth was full .
她只能点点头，因为她口里塞满了东西。
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I couldn 't sleep because of the noise .
嘈杂声吵得我睡不着。
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Just because I don 't complain , people think I 'm satisfied .
就因为我不发牢骚，大家便以为我满意了。
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Just because you 're older than me doesn 't mean you know everything .
你比我年长并不意味着你什么都知道。
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The school will be closed Monday because it 's a holiday .
星期一是公共假日，所以学校不上课。
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I was forced to take a taxi because the last bus had left .
最后一班公共汽车已经开走，所以我只好坐了一辆出租汽车。
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She did it first because she wanted to , and second because I asked her to .
她做那件事，首先是因为她自己想做，其次是因为我要她做。
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She was forced to retire early from teaching because of ill health .
她由于身体不好而被迫早早地从教学岗位上退休。
语气最强，表示因果关系，通常用来回答由 why 引导的疑问句。由 because 引导的分句置于句首时，须用逗号与主句隔开，置于句末时则不用隔开。
Because the traffic is so busy, she failed to arrive at the station on time.
因为路上交通太拥挤，她没能准时赶到车站。
He came back late because there was something wrong with his car.
他回来晚了，因为汽车出了故障。
如果所述理由是明显的或者已知的，则用 as 较 because 更为合适。
As it's raining, you'd better stay at home.
既然在下雨，你最好呆在家里。
He puts the ice cream into the fridge immediately, as it melts easily.
他马上把冰激凌放进冰箱，因为它很容易化掉。
for 属于并列连词，由它引导的分句表示补充说明性的理由，通常只能置于句末，且必须用逗号与前面的分句隔开。
He must have passed this way, for here are his footprints.
他肯定是从这条路走过去的，这里有他的脚印。
He has to work hard, for he wants to support his family.
因为要养家糊口，他必须努力工作。
当所述原因是已知的客观事实或被当作推断的理由时用 since，语气略强于 as。
Since he is absent, let's begin.
既然他不在，我们就开始吧。
Susan must have come back home, since her coat is not in the wardrobe.
苏珊肯定回过家，因为她挂在衣橱里的外套不见了。