he said with a smile as if he were talking about an old friend.这是新概念三册24课的课

he said with a smile as if he were talking about an old friend.这是新概念三册24课的课

这个属于虚拟语气用于条件状语从句中的情况。

表示与现在事实相反的假设,比如这里表示他好像在谈论一位老朋友，但事实是不是老朋友，条件状语从句中的谓语动词用“过去式（be动词的过去式用were）”,而主句中的谓语动词用“would / should/ could / might + 动词原形”.如：

I were a boy, I would join the army.

If the had time, she should go with you.
追答：If she had time手误

虚拟，用were表示与事实相反。

简单来说，这是as if 引导的【虚拟条件句】，其中无论主语用第几人称，be动词一律用were。
但是，有时，口语和非正式文体中，也可以使用was。
追答：例如
He talks about the accident as if he wereat the scene.
追问：很感谢，想请问 无论是 Iyoushe he 在这句话里都是were talking bout吗一律用were,是吗
追答：你说的很对!这是虚拟语气的规定。

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