4、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 , 变成 were, should, had + 主语的形式。但要注意，在虚拟条件状语从句中，省略连词的倒装形式的句首不能用动词的缩略形式。如我们可说 Were I not to do., 而不能说 Weren't I to do.

5、特殊的虚拟语气词：should

1）It is demanded / necessary / a pity + that… 结构中的主语从句的谓语动词要用 should 加动词原形， should 可省略。
句型：
It is suggested that we (should) hold a meeting next week.
It is necessary that he (should) come to our meeting tomorrow.
2）在宾语从句中的应用
　　在表示命令、建议、要求等一类动词后面的从句中。
order, suggest, propose, require, demand, request, insist, command, insist + (should) do
I suggest that we (should) hold a meeting next week.
He insisted that he (should ) be sent there.
注意：如 suggest, insist 不表示 " 建议 " 或 " 坚持要某人做某事时 " ，即它们用于其本意 " 暗示、表明 " 、 " 坚持认为 " 时，宾语从句用陈述语气。
The guard at gate insisted that everybody obey the rules.
判断改错 :
( 错 ) You pale face suggests that you (should) be ill.
( 对 ) Your pale face suggests that you are ill.
( 错 ) I insisted that you ( should) be wrong.
( 对 ) I insisted that you were wrong.
3）在表语从句，同位语从句中的应用
　　 在 suggestion, proposal, idea, plan, order, advice 等名词后面的表语从句、同位语从句中要用虚拟语气，即（ should ） + 动词原形。
My idea is that we (should) get more people to attend the conference.
I make a proposal that we (should) hold a meeting next week.