条件从句中省略 if 采用倒装语序的情况
在 if引导的表示虚拟的条件状语从句中，有时可以把含有助动词、情态动词、 be或 have的虚拟条件句中的连词 if 省去，而将 had , should, were 等词提到主语之前，即用倒装结构。
1). 原句： If she were younger, she would do it.
去 If： Were she younger, she would do it.
2). 原句： If he had tried it, he could have done it.
去 If： Had he tried it, he could have done it.
3).Had he worked harder, he would have got through the exams.
4).Were he to leave today, he would get there by Friday.
5).Were I in your place, I wouldnt do that.
6).Had I seen the film, I would have discussed it with them last night.
假如我看了那部电影，昨晚我就可以和他们一起讨论了。
7).Were I a bird, I could fly freely.
假如我是一只小鸟，我就能自由翱翔。
8).Should it rain next week the farmers would have a good harvest.
要是下周能下雨的话，农民们就能有个好收成了。
如果虚拟条件句中有 were, had或 should时，把它们放在 if的位置上 ;但是如果条件句中没有 were, had或 should不能用倒装。
⑴ Should it rain tomorrow, what should we do? 要是明天下雨的话，我们怎么办呢 ?
⑵ Were I you, I would have asked him for some advice.要是我是你的话，我就向他请教了。
⑶ Were he to do this work by himself, he would get a lot of money.如果他自己能够做此工作，他就会得到一些钱。
在 开放式条件句 和让步状语从句中 should是被省略了的。在这种情况下，如果 if省略，动词 be与主语的位置要倒装。
⑴ If any person be guilty of a crime, the court shall have the right to appeal.
Be any person guilty of a crime, the court shall have the right to appeal.
⑵ Whether she be right or wrong, she will have my unanswering support.
Be she right or wrong, she will have my unanswering support.
⑶ ____ ,I will take her as my wife.
Were she rich or poor
Being rich or poor
Be she poor or rich
Whether is she poor or rich
注意：有时虚拟条件句并没来 if 从句表示出来，而是用介词短语 、上下文或其它方式来表示。
⑴、 We didnt know his telephone number; otherwise we would have telephoned him.
⑵、 Without you help, I wouldnt have achieved so much.
⑶、 But for your help, I would not have succeeded.
有时虚拟条件句的从句或主句都可以省略其中一个：
1. I could help you.
2. If I had time.
3. She should have come to the meeting.
4. If he had much more money.
在 if引导的表示虚拟的条件状语从句中，有时可以把含有助动词、情态动词、 be或 have的虚拟条件句中的连词 if 省去，而将 had , should, were 等词提到主语之前，即用倒装结构。
1). 原句： If she were younger, she would do it.
去 If： Were she younger, she would do it.
2). 原句： If he had tried it, he could have done it.
去 If： Had he tried it, he could have done it.
3).Had he worked harder, he would have got through the exams.
4).Were he to leave today, he would get there by Friday.
5).Were I in your place, I wouldnt do that.
6).Had I seen the film, I would have discussed it with them last night.
假如我看了那部电影，昨晚我就可以和他们一起讨论了。
7).Were I a bird, I could fly freely.
假如我是一只小鸟，我就能自由翱翔。
8).Should it rain next week the farmers would have a good harvest.
要是下周能下雨的话，农民们就能有个好收成了。
如果虚拟条件句中有 were, had或 should时，把它们放在 if的位置上 ;但是如果条件句中没有 were, had或 should不能用倒装。
⑴ Should it rain tomorrow, what should we do? 要是明天下雨的话，我们怎么办呢 ?
⑵ Were I you, I would have asked him for some advice.要是我是你的话，我就向他请教了。
⑶ Were he to do this work by himself, he would get a lot of money.如果他自己能够做此工作，他就会得到一些钱。
在 开放式条件句 和让步状语从句中 should是被省略了的。在这种情况下，如果 if省略，动词 be与主语的位置要倒装。
⑴ If any person be guilty of a crime, the court shall have the right to appeal.
Be any person guilty of a crime, the court shall have the right to appeal.
⑵ Whether she be right or wrong, she will have my unanswering support.
Be she right or wrong, she will have my unanswering support.
⑶ ____ ,I will take her as my wife.
Were she rich or poor
Being rich or poor
Be she poor or rich
Whether is she poor or rich
注意：有时虚拟条件句并没来 if 从句表示出来，而是用介词短语 、上下文或其它方式来表示。
⑴、 We didnt know his telephone number; otherwise we would have telephoned him.
⑵、 Without you help, I wouldnt have achieved so much.
⑶、 But for your help, I would not have succeeded.
有时虚拟条件句的从句或主句都可以省略其中一个：
1. I could help you.
2. If I had time.
3. She should have come to the meeting.
4. If he had much more money.
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