Because除了在引导一个从句时可以放在句首时，其余情况Because 不能单独一个词放在句首。能这样用的含有"因为"意思的单词是therefore.
语法点：
1、because：后加从句。
比如：She doesn't go to school because she is ill. 她没来上学因为她生病了。
在这句话中 she is ill就是从句。所以because后面就是接从句。
2、在 because 引导的因果句型中，书写习惯是“先果后因”（与汉语正好相反）。否则，就要用 so 来引导结果从句。并且，because 与 so 是不能同时出现在一个句完整的句子里。
例句
1.Many accidents happen because people are careless.
很多事故是由人们的粗心引起的。
2.There are lots of parents that are despondent because they have a child that has a mobile addiction.
很多家长因子女玩移动设备上瘾而感到沮丧。
3.It is because of this that seed asia work stoconnect investors with entrepreneurs offline.
正因如此，SeedAsia致力于让投资者与创业者在线下联系。
4.It's because of the shale gas revolution.
“这是由于页岩气革命。
同义词辨析
because as for since
1、because conj. 因为
〔辨析〕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。
〔例证〕
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。
3、as conj. 因为，由于
〔辨析〕如果所述理由是明显的或者已知的，则用 as 较 because 更为合适。
〔例证〕
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。
3、for conj. [正式]因为
〔辨析〕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。
〔例证〕
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。
4、since conj. 因为，既然
〔辨析〕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。
〔例证〕
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
百度翻译because
liuyuecao110
