大理石桌面批发:as,because到底有什么区别

As
conj.
[as... as 结构中第二个 as, 它往往连接一个不完整的从句, 表示比较]和...一样, 象...一样
[表示方式]象, 按照, 如同
Run As I do.
象我这样跑。
Leave it As it is.
保持原状, 不要动它。
[表示时间]当..., 的时候 , 一边...一边, 随着
She sang As she worked.
她一边工作一边唱歌。
I saw him As he was getting off the bus.
正当他下公共汽车时, 我看见了他。
As a child, he lived in America.
他小时候住在美国。
You will grow wiser As you grow older.
随着你年令的增长, 你会变得更聪明。
[表示原因]因为, 既然
As you are tired, you had better rest.
(既然)你累了, 最好休息一下。
[表示结果和目的]以致于, 以便
Be so good As to come and join us.
务请来参加我们的活动。
[表示让步]虽然, 尽管
Rich As he is, he is not happy.
虽然他很富, 但他并不幸福。
Try As he would, he could not lift the rock.
他虽然尽了最大努力, 仍不能搬动那块石头。
As
pron.
[用在 such...as; the same... as 结构中]象...一样
这一点
As is well known
众所周知
The statemant reads in full As follows:
声明全文如下:
As
prep.
作为, 当作, 担任
He worked As a teacher.
他当教师。
As a work of art it is very poor.
作为艺术品这是十分拙劣的。
例如
Some animals, As dogs and cats, eat meat.
有些动物, 如狗, 猫等是食肉的。
如同, 象
unite As one man
团结得象一个人一样。

because
conj
因为
I do it because I like it.
我做这件事是因为我喜欢。
He's called 'Ginger' because of his bright ginger hair.
他长着一头淡黄色的头发,因而被人叫着'黄毛'。
He eats because of greed, not hunger.
他不是因为饿了,而是因为贪嘴才吃的。

其实当as,because都表示原因时，追究这两个词的意义并不大，一般考试都不会考这两个词的用法区别的
简单的说，一句话用到because时，说话者侧重于告诉大家做某某事的原因，强调前后句的因果关系
而用AS表‘因为’时，前后两句并列色彩比较浓，说话者更侧重于告诉大家一件事，原因只是顺便说说而已

当然AS还有其他的用法，AS的其他用法在意思上就可以跟because区分开了

其实as有两种意思
一个是，因为，而另一个是，当
就是说，as可是当作because,也能当成是when
father step in as i'm doing homework
father step in when i'm doing homework
当我在做功课时，爸爸进来了。

i cannot go home as it's raining now
i cannot go home because it's raining now
我不能回家，因为现在正在下雨。

所以，as和because两者都能换着来用。
要是说该用哪个，就要看你自己的语感了。

as表示已知的原因，引导的从句常放在句首
bucause语气最重，回答why只能用它，表示直接的理由