“因为” 是个连词或介词概念;“原因” 是个名词概念。
“因为” 的表达:because, as, since, for, because of, owing to, due to, on account of, thanks to...
“原因” 的表达:cause, reason, excuse, account
英语常用的两个表达式:
This is because ... (提供原因或理由)
That is why... (说明结果)
例如:
This is because he is ill.
That is why he hasn't come.
此“因果关系”, 你不能用错了格式。你把 becuase 和 why 换过来,试试。