time is one of the two elements that ameriacans save carefully,the other being labor.the other being labor中为什么要用being

time is one of the two elements that ameriacans save carefully,the other being labor.
the other being labor中为什么要用being

这是个独立主格结构,因为本句主语为time,谓语为is,the other being labor做状语,状语自己的主语为the other,谓语为is.当句中主语与状语的主语不一致时,是独立主格结构,状语的谓语用Ving形式.