关于should的一个语法点

题目

关于should的一个语法点
Should we have a position that we think suits you when would you be available to start?
这句种should提前疑似疑问句,但很明显这不是一个普通疑问句（个人认为）.那么这是一个什么语法?应该怎么理解?
（句子意思我大体知道,关键想知道这是一个什么语法点?）

答案

Should we have a position 是虚拟语气.省略了IF.本来的句子是
if we should have a position.如果我们会有个职位..
这里的should 和虚拟语气句里的would意思一样.
比如 if i were you ,i would go.如果我是你,我就会走.
虚拟条件句的倒装
虚拟条件句的从句部分如果含有were,should,或had,可将if省略,再把were,should或had 移到从句句首,实行倒装.
Were they here now,they could help us.
=If they were here now,they could help us.
Had you come earlier,you would have met him
=If you had come earlier,you would have met him.
Should it rain,the crops would be saved.
=Were it to rain,the crops would be saved.