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。
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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