虚拟语气倒装。
当虚拟条件句中含有 were，had，should，could等动词时，可以将if省略，然后将 were，had，should，could 等词移至句首：
1）if he should fail，he would kill himself.
should he fail，he would kill himself.
万一失败，他就会自杀。
2）if i were you，i would do it at once.
were i you，i would do it at once.
假若我是你，我就会马上做。
3）if i could do it，i would.
could i do it，i would.
要是我能做此事，我一定会做。
4）if he had seen you yesterday，he would h**e asked you about it.
had he seen you yesterday，he would h**e asked you about it.
他昨天要是看到了你，他就会问你这事了。
再看一些例句：
1）were they here now, they could help us.
if they were here now, they could help us.
他们现在在的话，就会帮助我们了。
2）had you come earlier, you would h**e met him.
if you had come earlier, you would h**e met him.
你来得早一点，就碰到他了。
3）should it rain, the crops would be s**ed.
were it to rain, the crops would be s**ed.
假如下雨，庄稼就有救了。
4）were i（= if i were）in your place，i wouldn’t do it．
5）had you（= if you had）seen it，you would h**e believed．
6）were they to get married（= if they were to get married），the would not be happy．
7）should he come，tell him to ring me up.
他要是来了，让他给我打个**。
8）were i in your position，i would go.
如果我处于你的地位，我就去。
9）had they not helped us，our experiment would h**e failed.
如果没有他们的帮助，我们的试验是会失败的。
典型例题：
1）not until the early years of the 19th century___what heat is
a. man did know b. man knew c. didn\'t man know d. did man know
答案为d. 否定词not在句首，要求用部分倒装的句子结构。
2）not until i began to work __how much time i had wasted.
a. didn\'t i realize b. did i realize c. i didn\'t realize d. i realize
答案为b。
3） do you know tom bought a new car?
i don\'t know, _
a. nor don\'t i care b. nor do i care
c. i don\'t care neither d. i don\'t care also
答案为b. 句中的nor引出部分倒装结构，表示\"也不\"。由 so, neither, nor引导的倒装句，表示前一情况的重复出现。
其中， so用于肯定句， 而 neither, nor 用在否定句中。
4）__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。
5your address，i would h**e written to you.
a. did i know b. were i to know
c. had i known d. if i should know
此题应选 c。这是虚拟语气的倒装形式。
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