让步状语指事实，用陈述语气，但是如果表现在或将来的假设情况时，使用be式虚拟或推定should+do，例如:

Though he stand/should stand alone, he will never yield.

但是even if/even though引导让步状语时，为什么不符合上述规律，却可以使用were式或were to+不定式，例如：

I shouldn't have time to see him even if he were here.

Even if she were to object, that would not change matters.

又如 Even if he did say so, we cannot be sure that he was telling the truth.

这里使用了did ? 这里的did是强调形式。

请问老师：

even if/even though引导让步状语，除了上面提到的可以使用were式或were to+不定式，还可以使用哪些形式呢？

可以使用动词的过去式，be式虚拟或推定should+do吗？