2012年全国公共英语等级考试五级语法精讲5

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2012年全国公共英语等级考试五级语法精5中 华 考 试 网

 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 had asked him yesterday, you would 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).
虚拟条件句的倒装
虚拟条件句的从句部分如果含有were、should、或had可将if省略,再把were、should或had移到从句句首,实行倒装。
Were they here now, they could help us.
=If they were here now, they could help us.
Had you come earlier, you would have met him
=If you had come earlier, you would have met him.
Should it rain, the crops would be saved.
=Were it to rain, the crops would be saved.
注意:
在虚拟语气的从句中,动词“be”的过去时态一律用“were”,不用was,即在从句中be用were代替。
If I were you, I would go to look for him.
如果我是你,就会去找他。
If he were here, everything would be all right.
如果他在这儿,一切都会好的。
典型例题
_____ 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. 在虚拟条件状语中如果有were, should, had这三个词,通常将if省略,主语提前

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