were to should had提前

were to should had提前

‍were to ，should都表示对将来的假设，had ved表示过去；举例如下：

if i were to study abroad，i would return after finishing my academic study.
were i were to study abroad，i would return after finishing my academic study.
if it should rain tomorrow，just cancel the picnic.
should it rain tomorrow，just cancel the picnic.
if i had studied harder in highschool，i would have already entered famous universty.
had i studied harder in highschool，i would have already entered famous universty.
特点：属于省略性倒装，仅适用于虚拟语气，真实条件句不可以。