英语达人请进,求教两个句子~

题目

英语达人请进,求教两个句子~
If the dialect was kept from daily use,the culture will be broken,which is also a great loss of traditional treasure,
我的问题是,条件句是虚拟语气与现在相反,为何主句却没有用would?而用will,这句话是否有语法错误?
另外,if虚拟语气与将来相反,条件句的动词形式到底能否用过去时?还是只有“should+do" "were to do" 两种.
第三,Lest we should find ourselves forever lose our rich cultural diversity,这个句子是否正确,如果正确,句中should 能否省略?

答案

1.如果是对现在事实相反,从句用动词过去式（be动词过去式一般用were) 我觉得这么改：If the dialect was kept from daily use,the culture would be broken,which would also be a great loss of traditional treasure,
2.与将来相反,条件句的动词形式只有“should+do" "were to do" 两种.
3.满对的