混合条件句的概念

主句与从句的动作发生在不同的时间，这时主，从句谓语动词的虚拟语气形式因时间不同而不同，这叫做混合条件句。

If you had asked him yesterday, you would know what to do now.

(从句与过去事实相反，主句与现在事实相反。)

If it had rained last night (过去), it would be very cold today (现在).

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