虚拟条件句往往指不能实现或纯假想的情况，可以对过去、现在或将来进行假想。 虚拟语气的本质就是对根本不可能的情况发生假设。我们可以记住这样一个原则，即把时态向过去推一格。
虚拟条件句 (Sentences of Unreal Condition)：当假设是不大可能实现时，就是虚拟条件句。例如：
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要弄清 虚拟条件句 （ Unreal conditionals ），首先要清楚虚拟语气及其相关用法。虚拟语气表示动作或状态不是客观存在的事实，而是说话人的主观愿望、假设或推测等。
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(真实条件句) If I were a bird, I could fly freely in the sky. (虚拟条件句) Were she younger, she would do it . 如果她年青点， 她就会干的。
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虚拟语气用于条件句 The Subjunctive in Conditional Sentences
如果明天下雪，我们将很高兴。(与将来事实相反的虚拟条件句)。
If it should (If it were to) snow tomorrow, we would be very happy.
要不是的帮助，我就不能提前完成这项任务。(与过去事实相反的虚拟条件句)。
If it hadn't been for your help, I couldn't have finished it ahead of time.
西班牙语的动词现在时有六种形态，过去时、未完成时、将来时、条件句、虚拟句以及另外两种过去时虚拟式也各自有六种形态，加起来一共是48种。
A Spanish verb has six present-tense forms, and six each in the preterite, imperfect, future, conditional, subjunctive and two different past subjunctives, for a total of 48 forms.
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