问一道时态问题

Ne-yo

请问这句话的时态对不对？
teachers would be given raises if test scores show that their students's mastery of reading skills has improved over a nine-month period.
为什么要用would 不用will?

Ne-yo

如果是虚拟 为什么if后面的show 不变成were to show

bigpig

虚拟有3种

Ne-yo

回复 3# bigpig


    恩是啊 这是对将来的虚拟吧

bigpig

回复 4# Ne-yo


    were to 只是其中一种

Ne-yo

那你说说 具体是哪三种  were to是对将来的虚拟呀

bigpig

回复 6# Ne-yo


    后面接一般现在时也可以啊

Ne-yo

啊？什么时候可以接一般现在时啊

myice

if+were to, would/could do  
if+had done, would/could have done..

Ne-yo

回复 9# myice


    恩对 这是对过去的虚拟