高中英文谁能解释一下这句话的语法结构？
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should倒装表示虚拟语气，比if 虚拟语气要弱一些，相当于中文万一的概念。
if it were to rain tomorrow ，we would cancel the picnic on weekend
也可以表示万一明天下雨，---
if it should rain tomorrow ，we would cancel the picnic on weekend
经过倒装，最后成为
should it rain tomorrow ，【we would】 cancel the picnic on weekend.
if it were to rain tomorrow ，we would cancel the picnic on weekend
也可以表示万一明天下雨，---
if it should rain tomorrow ，we would cancel the picnic on weekend
经过倒装，最后成为
should it rain tomorrow ，【we would】 cancel the picnic on weekend.
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