1. conj. 因为
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 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。
the is so busy, she to at the on time.
因为路上交通太拥挤，她没能准时赶到车站。
Just I don't , think I'm .
就因为我不发牢骚，大家便以为我满意了。
He came back late there was wrong with his car.
他回来晚了，因为汽车出了故障。
The team has made some two are .
因有两名队员受伤，这个队将队员做了些位置上的调整。
The party went well into the of .
晚会很成功，因为每个人都很投入。
We 't them they were in .
我们听不懂他们在讲些什么，因为他们说的是汉语。
will be done no one in takes the .
什么也办不了，因为掌权的谁也不认真对待这个问题。
I was to take a taxi 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。
She was like a freak she didn't want .
她因为不要孩子而被当作怪人。
She did it first she to, and 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。
2.as conj. 因为，由于
如果所述理由是明显的或者已知的，则用 as 较 更为合适。
We asked to come with us, as he knew the road.
我叫上飞利浦和我们一道去，因为他知道去的路。
As it's , you'd stay at home.
既然在下雨，你最好呆在家里。
As you're tired, you rest.
你累了，应该休息。
He puts the ice cream into the , as it melts .
他马上把冰激凌放进冰箱，因为它很容易化掉。
They are sent about , but they read them as they have so much to deal with…
他们经常会收到关于人身安全问题的宣传册，但因为大量文案工作缠身，他们几乎无暇阅读。
如果原因已被人们所知，或不如句子的其它部分重要，就用as或since。Since比as稍微正式一点。As和since 引导的从句一般放在句子的开头。例如：
As he wasn’t ready, we left him.
由于他没有准备，我们没有带他。
Since I have no money, I can’t buy any food.
既然我没有钱，我不能买任何食物。
3.for conj. [正式] 因为
for 属于并列连词，由它引导的分句表示补充说明性的额外增补的的理由，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 this way, for here are his .
他肯定是从这条路走过去的，这里有他的脚印。
He must be ill, for he hasn't come to work today.
他今天一定病了，因为他没来上班。
I to stop and have lunch—-for I was quite .
我决定停下来，吃午饭。因我感觉很饿。
He has to work hard, for he wants to his .
因为要养家糊口，他必须努力工作。
I her ─ for she would not lie to me.
我相信她的话——因为她肯定不会向我撒谎。
He had a great to have a home of his own for he had lived with my .
他强烈渴望拥有一个属于自己的家，因为他一直和我祖母住在一起。
We , for he news of our .
我们急不可待地听着，因为他带来了我们家人的消息。
在（文学）故事中，for有时用于解释或论证：
He to be in need of , for he went back into the house.
他看起来需要陪伴，因为他突然回到了屋里。
4.since conj. 因为，既然
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 , let's begin.
既然他不在，我们就开始吧。
Since it's , we'll stay .
既然下雨了，我们就待在室内吧。
Susan must have come back home, since her coat is not in the .
苏珊肯定回过家，因为她挂在衣橱里的外套不见了。
Since the juice is quite , you it.
这种果汁太浓，所以必须加以稀释。
The is , since 'self-' art is on in a big way.
展会召开得非常及时，因为“自修”艺术正在广泛流行。
Since Mr was going to need some time off work, he asked for a sick note
因为贝内特先生要请假一段时间，他请医生开了病假条。
Since he was color blind, he large, showy
因为他是色盲，所以他喜爱大朵艳丽的花。
Since she knows , she keeps to .
因为不怎么懂意大利语，她很少和人交往。
I'm on a diet, since I put on .
我永远都在减肥，因为我很容易长胖。
He had to be with , since he was one of only seven out of forty who were .
他有理由沾沾自喜，因为他是40个候选人里仅有的7名成功者之一。
We that, since we were in the area, we'd stop by and see them.
我们想，既然到了这个地方，就该顺便去看看他们。
He that the issue had moot since the board had its .
他争辩说这项议题已变得毫无实际意义，因为董事会已经改变了政策。
Since his wife was much than he, he was of being .
因为他妻子年龄比他小得多，他老是怕戴绿帽子。
汉英大词典
在语气上， 最强烈，其次是 since 和 as，for 最弱。
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