I had ever seen it before.
我曾经看过了.
I had never seen it before.
我从来没有见过它.
两个句子的差别在于ever 于never之间,
ever是曾经,never是从未.
ever是曾经的意思,肯定意义,也可以作疑问.而never是从不;从未的意思.