because和as的区别:
1、because,as作为连词,都有"因为"的意思。
2、because 是从属连词，接表示直接原因的从句，一般放在主句的后面，也可放在主句前面，它表示的语气最强，在回答why的问句时，,必须用because。
3、as 是从属连词，说明一般的因果关系，语气比because弱，说明比较明显的原因，它引导的从句通常放在句首，有时也可放在句末。
拓展资料
because
1、He is called Mitch, because his name is Mitchell
人们叫他米奇，因为他大名叫米切尔。
2、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。
3、Many families break up because of a lack of money
许多家庭由于缺钱而破裂。
4、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。
5、Because it is an area of outstanding natural beauty, you can't build on it
考虑到这一带自然风光旖旎，你不能建在这里。
as
1、Another policeman has been injured as fighting continued this morning
今早又有一名警员在冲突中受伤。
2、I never went through a final exam that was as difficult as that one
我从来没有碰到过像那次那么难的期末考试。
3、You can look forward to a significant cash return by saving from as little as £ 10 a month
只要每个月存下区区10英镑，你就有希望得到相当可观的现金收益。
4、He has worked as a diplomat in the US, Sudan and Saudi Arabia
他曾任驻美国、苏丹和沙特阿拉伯的外交官。