过去将来时的用法
过去将来时，一般用于主句为过去时的`宾语从句中。如：
He said he would stay with us. 他说他要与我们呆在一起。
He said he would never go there again. 他说他绝不会再去那儿。
过去将来时，用于虚拟语气中，如：
If I were you, I would not do that. 要是我是你的话，我就不会那样做。
If he were here, he would show us how to do it. 如果他在这儿，他就会向我们展示该如何做了。