as mentioned above和as is mentioned above有什么区别
问题描述：
as mentioned above和as is mentioned above有什么区别
答
as mentioned above是as it is mentioned above的省略，as引导状语从句。
as is mentioned above，as为关系代词，引导的非限制性定语从句。
两者结构不同，但意思表达相同。
答
as mentioned above,如上所述,一般做插入语As mentioned above,an object has positive charge when it has lost electrons.如上所述,物体失去电子时带正电荷.as is mentioned above,如上所述,也做插入语As is menti...