The mountain is not valuable because it is high.
正：山并不因为高而具有价值。
误：山没有价值因为它高。
分析
含有原因状语从句，且主句有否定词的复合句，形式上虽然否定主语，然而意义上则是否定该原因状语，
译为“并不因为……而……”。
例句：
Galileo was not ready to accept it ,just because Aristotle had said so.
伽利略并不只是因为亚里斯多德说过某事如何，就轻易接受它。
原因状语从句否定转移的情况要根据具体情况加以分析：
I didn't go to your party because my mother was ill.
因为我妈妈病了,所以我没去参加你的聚会。
I did not go to school yesterday because I was ill.
我昨天没去上学,因为我生病了。