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有时主句和从句的谓语动词指不同的时间，这时需要用混合虚拟语气。一般来说，在这种情况下，主从句谓语动词指代的时间不同，所以我们又可以错综时间条件句，在这种虚拟情况，动词形式应根据实际情况灵活使用，在做这些题目时候尤其要注意每道题目的提示语：时间状语。绝大多数情况下，从句或者主句都有相关的时间状语，这是我解题的关键。
If you that late movie last night, you wouldn't be so sleepy.
A. haven't watched
B. didn't watch
C. hadn't watched
D. wouldn't have watched
答案选C。
Many dead would now be alive if they have not attempted to return for
something.
Had Paul received six more votes in the last election, he would be our
chairman now.
混合虚拟语气还有一种情况就是事实和虚拟假设的混合句，这样的句子不仅仅是时间的不同，而重要是事实和假设的混合。
I would have gone to visit him in the hospital had it been at all possible,
but I was fully occupied the whole of last week.
该句前半部分是假设虚拟，而后半部分是事实的陈述。
Your math instructor would have been happy to give you a make-up
examination had you gone and explained that your parents were ill at the
time.
该句前半句用的是假设虚拟，后半句主句也用的是假设虚拟(如果你去并且解释的话)，但是后半句的从句用的是事实语气，因为“父母病了”是客观事实，故不需要用虚拟形式had
been,
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