There was no air or water,there would be no life in the world.

There was no air or water,there would be no life in the world.
这个句子开头为何不倒装?不是虚拟了吗,而且省略了if
倒装规则之一,虚拟语气中省略if时需要倒装
这不是灵活的问题,这是违反规则例外的问题,违背规则就叫学的不死了?只能说例外罢了.