一个句子的分析（关于情态动词）

should （用于间接引语,表示）将
给你举个例子解释一下,
"If it should rain tomorrow,the sports meeting would be postponed." "要是明天下雨,比赛就延期举行."
把上面的句子中should 提到句首,表示虚拟语气,
Should it rain tomorrow,the sports meeting would be postponed." "要是明天下雨,比赛就延期举行."
这两个句子意思一样.
那么If you should be fired,your health care and other benefits will not be cut off.和提问中提到的句子意思也一样.