请问 as far as I am concerned 是个什么语法结构啊,我查了字典,as far as 为副词

as far as 是三个词,不能说是副词,而是一个副词短语,
意思为就.而言,据.用于引导状语.
as far as I am concerned在句子中的语法成分既为状语,
我觉得可以理解为条件状语或者程度状语,
意思为【就我而言】或【据我所知】.