Inversion当中的取代if的虚拟语句中,如何分were,had和should 的用法

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Inversion当中的取代if的虚拟语句中,如何分were,had和should 的用法
例如,1.Had the books been cheaper,I would bought them all.
2.Were the minister to fail to get the necessary support,he would be forced to call a snap election.
3.Should you need any further assistance,do not hesitate to contact us.
这3个的用法如何不同呢?

这三个句子都是属于If虚拟语句的特殊用法,都是省掉了If,然后把：had,were,should给提前了.其实要说这三者的区别,的从if的虚拟情况来区分：
1 当是对过去的虚拟时,也就是与过去事实相反时.if的从句要用过去完成时(had+动词过去分词）,主句要.would、should+have+动词的过去分词
2 当是现在的虚拟时,也就是与现在的事实相反时.if的从句要用一般过去时,主句要用would/should+动词原形
3 .当是对将来的虚拟时,也就是与将来事实相反时.if的从句要should+动词原形或were to+动词原形,主句要用would/should+动词原形.
所以由上可知：第一句是对过去的虚拟,第二句是对将来的虚拟,第三句也是对将来的虚拟.

if 条件句的倒装如果含有if的虚拟条件句中有were,should,had则可以把if省略把were,should或h 关于虚拟语气中was和were的用法在虚拟语气的从句谓语中出现 were,should,had 时,可以省略if,同时把这个词放到句首,形成倒装. If it were to snow 和 If it should snow 都是对将来的虚拟吗?有什么不同呢关于if的倒装请教一下,if虚拟语气的倒装不放句首可以吗?为什么大部分都解释为should,had,were 放句首? 虚拟语气对将来的推测中if+主语+were to do if+主语+should+do if+主语+did/were三种 as if 虚拟的用法虚拟语气中省略if的用法 if he had known the truth,he would have told t 虚拟语气的用法,谢谢虚拟语气：they treated me as if i were a prince.中虚拟语气是什 if you were my daughter对吗?if有虚拟语气的用法吗虚拟语气中should的用法高手指教关于虚拟语气中should用法的问题,