外语请问这句话should的用法和意思。

来源：百度知道编辑：UC知道时间：2024/05/31 08:43:55

Should you fail the eyesight test you will be asked to produce a
satisfactory eyesight report issued by a general practitioner.

这里的should为什么在肯定句也可以放在前面，表示什么意思？是什么用法来的？

虚拟语气为了强调可以采用此倒装形式，去掉if,将should提前。

强调吧

虚拟，是对未来情况的肯定推测

虚拟语气的倒装，原本语序是if you should fail the eyesight test you will be asked to produce a
satisfactory eyesight report issued by a general practitioner
在虚拟语气中should和had可以使用上述倒装

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