全国大众英语测验语法——混合前提句
主句与从句的举措发作在不合的时候，这时主，从句谓语动词的假造语气形式因时候不合而不合，这叫做混合前提句。
If you had asked him yesterday, you would know what to do now.
（从句与过旧毕竟相反，主句与现在毕竟相反。）
If it had rained last night (过往), it would be very cold today (现在).

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