做状语
相当于这个条件状语从句：
if we were given more time,we should have done it much better
是个虚拟句子,要是再多给我们时间,我们就会做的更好这是一种变化规律吗？如果是 麻烦详述.涉及两个知识点：第一个是虚拟的省略if 的倒装，就变成，were we given more time第二个是结合非谓语，把主谓部分一起省略，we were 这个主谓省略，就变成more time given其实，more time given 是这么来的：if more time was given= was more timegiven( 省略if 的倒装）if more time was given=more time given (非谓语，given 过去分词做条件状语）任何一种思路都讲的通