虚拟语气求解答.T TAccording to the weather report,it may rain tomor

横线上那句的原型是：if it should not rain
表将来时态的虚拟语气 ——从句谓语形式：动词过去式(be用were)/should + 动词原形/were to + 动词原形;主句谓语形式:would / should / might / could + 动词原形
should可以提前,并去掉if,这与"Were I ten years younger,I would study abroad=If I were ten years younger,I would study abroad"是一样的道理.
虚拟语气的从句和主句可以是任意句式,否定当然也可以.

可以否定，可以倒装。
It should rain
It should be/do
should it not rain=If it should/would not rain
举例：
Should it be summer, I would go swimming.

虚拟语气只要记住一个句子就行了 IF i were you , i would buy a car 如果我是你，我就买辆车，但实际上我并不是你，因此虚拟语气往往描述的与事实相反的事情。
从上面的句子看
根据天气预报明天会有雨，但是要是不下雨，我们就必须自己浇水了。（后面的要是不下雨和天气预报相反），因此原句应为 according to the weather report it...