大家看看这句话是什么语法现象?

Were if left to me to decide whether we ...你此处有误,
应为Were it left to me to decide whether we ...,是虚拟条件句条件从句If it were left to me to decide whether...省去if,将were提前到主语之前的用法.
请这位朋友记住以下规则：
当虚拟条件句中的if条件状语从句中谓语动词含有were,had,should时,可省去if,将were,had,should提到从句主语的前面去.
又如：
Were I to do it by myself(=If I were to do it by myself),I might not finish it on time.
Had I followed your advice,I would have finished it earlier.
Should he have enough time,he would surely drop in on her.
注意：虚拟语气中系动词be通常通用were.