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虚拟条件句中与将来事实相反得假设的三种结构是什么?请给例句!

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虚拟条件句中与将来事实相反得假设的三种结构是什么?请给例句!
虚拟条件句中与将来事实相反得假设的三种结构是什么?请给例句!
与将来事
实相反
a.If+主语+动词的过去式(e动词过去式一律用were)
b.If+主语+should+动词原形
c.If+主语+were to+动词原形 ,主语+would或should+动词原形
与将来事实相反
If it rained tomorrow, we should stay at home.
如果明天下雨,我们就待在家里.(最近天气好,下雨的可能性不大.)
If he should come, I could have a talk with him.
如果他来,我就能跟他谈谈.
If I were to do it, I would do it in a different way.
要是我来做这件事,我会用另一种方法.