It was the quietest wood you could possibly imagine

There were no birds, no insects, no animals, and no wind. You could almost feel the trees growing.

They were no bigger than ordinary rings, and you couldn't help noticing them because they were so bright.

But it was a nicer sound than that, a more musical tone: only so faint that you could hardly hear it.

它们是虚拟吗？是对什么时态的虚拟？如果是现在时故事又发生在过去，难道是真实条件句吗？