虚拟语气倒装,should引导的虚拟语气倒装

1,只将were /should /had...等提在句首,not放在原位置: Had it not been for your help, we could have finished it on time. Should it not rain tomorrow, we woul go outing.

2,虚拟语气倒装属于部分倒装，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。 If he should fail，he would kill himself. →Should he fail，he would kill himself. 万一失败，他就会自杀。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。用法：主语从句中的虚拟语气主要取决于某些形容词和过去分词，用来表示建议、命令、要求、惊异和失望等。其形式为：(should)+动词原形。表语从句和同位语从句中的虚拟语气在表示建议、命令、主张、目的和愿望等名词后面的表语从句和同位语从句中谓语动词要求使用虚拟语气。其形式为：(should)+动词原形。宾语从句中的虚拟语气某些动词后所接宾语从句中的谓语动词要求用虚拟语气，用来表示建议、命令和要求等。其形式为：(should)+动词原形。错综、混合虚拟语气通常，在上面表格里反映的是非真实条件句的虚拟语气模式，从句和主句的谓语动词时间是一致的，如果两者时间不一致，此时就是混合型虚拟语气。混合型虚拟语气的使用要求各自为政，即从句和主句根据各自假设的时间不同，采用上面表格中对应的的谓语动词形式。混合虚拟语气还有一种情况就是事实和虚拟假设的混合句，这样的句子不仅仅是时间的不同，而重要是事实和假设的混合。含蓄虚拟语气因为有时假设的情况并不是以if引导的条件从句形式出现，而是通过一些短语等形式暗示虚拟语气的存在，常用的词语有with, without, but for, otherwise, or，even, in case of, what if(如果…将如何)等等，这种句子往往有主句而无从句 (考试时多数情况是对过去的假设)。有时可将条件从句的连词if省略，但此时应用倒装句型，即把从句中的 等提到句首：Were I Tom,I would refuse. 如果我是汤姆，我会拒绝。Should it be necessary,I would go. 假若有必要，我会去的。Had it not been for the bad weather we would have arrived on time. 若不是天气坏，我们就准时到达了。【注】① 若条件从句为否定句，否定词not应置于主语之后，而不能与were,should,had 等缩略成Werent,Shouldnt,Hadnt而置于句首。② 有时省略if后提前的had不是助动词：Had I time,I would come. 假若我有时间，我会来的。(=If I had time…)

3,虚拟语气倒装倒装句用法 英语的基本句型是主语 + 谓语。如果将主语与谓语调换, 称倒装句。 装句分全倒装句和半倒装句。 一、  全倒装: 主语与谓语交换位置不需任何助动词, 叫全倒装。全倒装有以下三种情况: 当here, there, out, in, up, down等副词放在句首时, 句子需全倒装: there goes the bell! 铃响了！  there lived an old man.    here comes the bus.注意:   ①在这种情况下倒装仅限于不及物动词或be动词, 像go, come, mush等。   ②主语如果是代词时不需倒装如away he went. 他走远了。 方位状语在句首, 如: in front of the house stopped a police car. nearby were two canoes in which they had come to the island. under the tree sat a boy. 3 、直接引语在句首, 这种情况可倒装也可不倒装  "what does it mean?" asked the boy或the boy asked. 二、半倒装: 主语与谓语的助动词交换位置称半倒装, 有以下数种情况: 1,否定意义的词在句首, 句子半倒装, 例如: little, never, not, no, hardly, rarely,seldom never shall i forget you.   at no time was the man aware of what was happening. little did i understand what he said to me at that time.   几对并列连词如not only…but also, hardly… when等连接两个并列句, 连词在句首, 前句半倒装, 后句不倒装: not only was everything he had taker away from him, but also his german citizenship was taken away. no sooner had i got to the bus stop than the bus started. 注意:    ①not only…but also连接两个并列主语时不需倒装, 如:not only you but also i like playing chess. ②neither…nor在句首时, 前后两句都需倒装,neither do i have a sister nor does my husband. only在句首强调状语, 主句半倒装: only then did i realize that i was wrong.only in this way can i learn from my fault. only when the war was over in 1918, was he able to get back to work. 注意: only强调主语不倒装:only the teachers can use the room. so…that句型, so在句首时, 主句倒装, that从句不倒装: so easy is it that a clild can learn it.so hard did he work that he finally won the fame. i saw the film, so did he. 5.省略了if的虚拟条件句 had  i  been informed earlier, i could have done something.were she here, she would support the motion.