外语请问这句话should的用法和意思.Should you fail the eyesight test you will be asked to produce asatisfactory 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,是什么用法来的?
问题描述：
外语请问这句话should的用法和意思.
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,是什么用法来的?
答
强调吧
答
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
答
虚拟语气为了强调可以采用此倒装形式,去掉if,将should提前.
答
虚拟，是对未来情况的肯定推测