If he should come， I will tell him the truth. 万一他来，我一定会把真相告诉他。

Should the boy come again， I would throw him out. 要是那男孩在来，我就把他撵出去。

If it should rain， our plan would be spoiled. 万一下雨，我们的计划就泡汤了。

Should that be true， the contract would be canceled. 假如那是真的，合约就该取消。

Should another world war break out， what would become of human beings?

万一另一次世界大战爆发，人类将会发生什么事?

If I were to ， I

结构︰Ifwere to，would/should 等+原形动词

说明︰这也是表示与未来状况相反的假设句型，与if should， 大致相同，但if were to所表示的可能性更低，通常用以表示与真理相反的假设语气.

If the sun were to rise in the west， he would pass the exam.

要是太阳从西边出来，他就会通过考试他不可能通过考试。

If I were to be born again， I would like to be a bird. 我要是再活一次，我想当一只鸟。

If the sun were to disappear， what would the earth be like?

万一太阳消失了，地球会变成什么样子?

Were I to die tomorrow， what would my children do?

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