有時主句和從句的謂語動詞指不同的時間，這時需要用混合虛擬語氣。一般來說，在這種情況下，主從句謂語動詞指代的時間不同，所以我們又可以錯綜時間條件句，在這種虛擬情況，動詞形式應根據實際情況靈活使用，在做這些題目時候尤其要注意每道題目的提示語：時間狀語。絕大多數情況下，從句或者主句都有相關的時間狀語，這是解題的關鍵。

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

答案選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.

混合虛擬語氣還有一種情況就是事實和虛擬假設的混合句，這樣的句子不僅僅是時間的不同，而重要是事實和假設的混合。

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.

該句前半部分是假設虛擬，而后半部分是事實的陳述。

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.

該句前半句用的是假設虛擬，后半句主句也用的是假設虛擬(如果你去并且解釋的話)，但是后半句的從句用的是事實語氣，因為“父母病了”是客觀事實，故不需要用虛擬形式had been。

編輯推薦：

考博英語語法串講：非謂語動詞中的有關句型

（責任編輯：gx）

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