Question

If it were Sunday tomorrow, I should (would，could，might) go to see my grandmother.

此句式对将来事实的假设，从句中怎么可以用were表示，不理解，谢谢

Answer 1

1.与现在事实相反
If+S+过去式动词，S+would(could ,should, might)+原型动词
例如:If I were rich,I would help you.
因为现在我不有钱，所以是与现在事实相反的用法

2.与过去事实相反
If+S+过去完成式，S+would(could ,should, might)+have+p.p
例如:If he had told me the truth,I would not have made the mistake.
因为已经是过去的事了，所以假设句一律用完成式

3.与未来事实相反
表示对未来事情的假设，实际上绝不可能发生。
If+S+were to +V，S+would(could, should, might)+原型动词
例如:If you were going to part with us , she would be canceling the date.
如果你今晚跟我们一起去派对, 她就要取消她的约会.

4.现在或未来可能发生的状况
If+S+现在式动词，S+ 祈使句 或 will(can,may,shall )+原型动词
例如:If it rains tomorrow,I shall not go.

Answer 2

明天永远不可能是星期天 这是一个事实 而不一定要用将来的假设啊 可以啊

Answer 3

这是虚拟语气
if+主语+过去时+其他+主语+should/would/could/might+do+其他
例：
If I were you, I would take an umbrella.如果我是你，我会带把伞。（事实：我不可能是你）