3. 混合條件句

　　有時，主句與從句的動作發生在不同的時間，主句從句謂語動詞的虛擬語氣形式因時間不同而不同，這種條件句叫做混合條件句。例如：

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

　　如果你昨天問過他，今天就知道做什么了。

　　(從句與過去事實相反，主句與現在事實相反。)

　　If it had rained last night(過去), it would be very cold today (現在).

　　如果昨晚下過雨，今天就會很冷了。

　　4. 虛擬條件句的倒裝

　　虛擬條件句的從句部分含有were, should, 或had時, 可省略if，再把were, should或had 移到從句的句首，實行倒裝。例如：

　　Were they here now, they could help us. =If they were here now, they could help us.他們現在在的話，就會幫助我們了。

　　Had you come earlier, you would have met him. =If you had come earlier, you would have met him.你來得早一點，就碰到他了。

　　Should it rain, the crops would be saved. =Were it to rain, the crops would be saved.假如下雨，莊稼就有救了。

　　注意：在虛擬語氣的從句中，動詞\'be\'的過去時態一律用\"were\"，不用was，即在從句中be用were代替。例如：

　　If I were you, I would go to look for him. 如果我是你，就會去找他。

　　If he were here, everything would be all right. 如果他在這兒，一切都會好的。

　　典型例題

　　_____ to do the work, I should do it some other day.

　　A. If were I B. I were C. Were I D. Was I

　　答案C. 在虛擬條件狀語中如果有were, should, had這三個詞，通常將if省略，主語提前, 變成 were, should, had +主語的形式。但要注意，在虛擬條件狀語從句中，省略連詞的倒裝形式的句首不能用動詞的縮略形式。如我們可說 Were I not to do, 而不能說 Weren\'t I to do。

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