【简明语法】16.3 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间不同而不同，这叫做混合条件句。
　　If you had¹ asked him yesterday, you would² 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).

1 had   

vbl.have的过去式和过去分词；conj.有

参考例句：

• I just had a good idea!我有个好主意！
• The boy had a small branch of a tree in his hand.这个男孩手上拿一条小树枝。

2 would   

aux.will的过去式；愿，要；常常；大概；将要，会

参考例句：

• Why would you say that?为什么你会这么说？
• Would you please help me?你能帮帮我吗？