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20.2 针对过去事实的虚拟
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表示出于主观愿望，违背过去已经发生的事实。其基本表达规则为：在条件从句中，谓语动词使用过去完成时；在主句中，谓语动词形式为would(或could, might, should)接现在完成时。
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1705082989
I would have been a failure if I had let those worries and fears control me.
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1705082991
假如当时让这些忧虑和担心控制了我，我就一败涂地了。
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1705082993
If I had known it would come to this, I would have acted differently.
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1705082995
如果当初我知道结果会这样，我就不会这么做了。
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If we hadn’t made what looked like a terrible error, we never would have been forced to rethink our master plan.
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倘若当时我们没有犯看似严重的错误，我们就不可能被迫想出我们的总体规划。
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Many persons in the world would have scored achievement if they had not wasted the valuable time.
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假如没有浪费掉宝贵的时光，世界上会有许多人取得成就。
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Capital is only the fruit of labor, and could never have existed if labor had not first existed.
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金钱是劳动的结果，如果没有劳动在先，也就不存在金钱。
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20.3 针对将来情况的虚拟
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表明在将来事情没有实现的可能性，或者实现的可能性不大。其基本规则为：条件从句中谓语动词用should(或were to)接动词原形的形式；主句中谓语动词形式为would(或could, might, should)接动词原形。
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If things were to be done twice, all would be wise.
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如果将来事情能做两次，人人都会变得聪明。
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If the highest aim of a captain were to preserve his ship, he would keep it in port forever.
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1705083020
假如船长的最高目标是保全船只，他就会永远不让船出港。
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1705083022
If you should put even a little on a little, and should do this often, soon this too would become big.
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假如你经常做一点一滴的努力，不久就将取得伟大的成就。
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20.4 省略条件从句的虚拟
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有时在虚拟表达中，不出现条件从句，而用单词、词组替代，用不定式替代，或者由上下文表现。
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用单词、词组替代
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常见的单词有otherwise, or(否则)等，词组包括由without, but for(如果没有，要不是因为)等引导的词组。
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