betweenthetwogenerations,itisoftennottheirage,buttheireducationthatcausesmisunderstand.but后面不是应该一个句子吗?为什么是一个定从?

Question

between the two generations,it is often not their age,but their education that causes misunderstand.but 后面不是应该一个句子吗?为什么是一个定从?

Answer 1

not...but...不是.而是.（关联词,在句中连接their age和their education两个名词短语
）,这里but 后面接的是their education,而不是定语从句,that causes misunderstanding 是定语从句,修饰 their education.
句子翻译：两代人之间,常引起误解的是他们所受的教育,而不是年龄问题.（misunderstand
还是misunderstanding?）