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查字典大学网整理了2015年12月英语四级备考核心语法，重点介绍考试必考的虚拟语气内容，希望大家用心复习一下哦！

虚拟语气：与事实相反的

一、主语从句：

1、it is +adjn that + 虚拟

2、it is +done(表示建议、要求)that + 虚拟

二、宾语从句：

1、I suggest(表示命令;建议;请求) that shoule +do (在虚拟语气中，shoule have done = ought to have done,其他时候should 不等于ought to) 2、I wish that (用虚拟语气)

三、目的状语：

Lest或者for fear that + (虚拟语气)should do

四、 if从句： 即 主句, if 从句

1、倒装代替if从句：HadWereShould ，主句

2、but for = without(如果不是)代替if从句， 两个都是介词 But for without + 名词 ，主句

3、with + 名词 ，主句

4、if only + (if 从句) 要是该多好

五、隐藏虚拟语气：本打算做但结果没有做的

1、had hopedintendedplannedexpectedwantedmeant to do

2、hoped to have done

3、be(waswere) + to have done 4、wouldshould like to have done Would have done 表意愿、将来

Should have done 竟然做了、本应该做的 Could have done 有能力做 Might have done 表示猜测

Need have done 本来需要做的却没有做

主从句时间不一致情况下的虚拟语气

有时条件从句中的动作和结果与主句中的动作，发生的时间不一致，这时动作的形式应根据它所表示的时间加以调整。如：

1. 从句表示将来，主句表示过去：

⑴、If I were not to make a preparation for my experiment this afternoon, I would have gone to see the film with you last night.

2. 从句表示过去，主句表示将来：

⑴、If they had started the early morning yesterday, they would be here now.

⑵、If we hadn' t made adequate preparations, we shouldn' t dare to do the experiment next week。

3.从句表示将来，主句表示现在：

⑴、If we shouldn't have an exam this afternoon, I would go shopping now.

4.从句表示过去，主句表示现在。

⑴、If they had stared the early morning yesterday, they would be here now.

⑵、If you had followed my advice, you would be able to finish the work now.

5.从句表示过去，主句表示过去和现在

⑴、If you hadn’t lent me some money, I couldn’t have bought the new house and most likely I would be still living in the dangerous house now.

在不少情况下，虚拟式已变成习惯说法，很难找出其暗含的条件。

(1) 、You wouldn’t know. 你不会知道。

(2) 、 would like to come. 我愿意来。

(3) 、I wouldn’t have dreamed of it. 这是我做梦也不会想到的。

(4) 、He told the story in such minute detail that he might himself have been an eye-witness. 他将那事讲的非常仔细，简直就象他亲眼看见一样。

6.从句表示现在，主句表示过去

⑴、If I were you, I would have gone to her birthday party.如果我是你，我就去参加她的生日晚会了。(从句说明现在，主句说明过去。)

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