虚拟语气---混合条件句

　　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这叫做混合条件句。

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

　　If it had rained last night , it would be very cold today .

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