It seems as if he were an expert 为什么谓语动词要用were 而不是was

It seems as if he were an expert 为什么谓语动词要用were 而不是was

题目
It seems as if he were an expert 为什么谓语动词要用were 而不是was
答案
虚拟语气,固定要求 如 if i were you i would have not XXX 如果我是你 怎么怎么,我不是你 我也没做,一种假设 与事实相反
实际上他不是expert 与事实相反.
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