【篇一：特殊形式的虛擬語氣】
虛擬語氣的特殊形式，即用來表示要求、建議、命令、提議、意愿等的主語從句、賓語從句、表語從句和同位語從句中的虛擬形式，其虛擬語氣的構成往往是由should(可省略)+動詞原形that從句。
A、 用于表示意愿、建議、命令、提議、請求等動詞后的that賓語從句中，這類動詞有：
ask要求 advise建議 arrange安排 beg請求
command命令 decide決定 demand要求 desire渴望
determine決定 insist堅持 intend打算 maintain堅持主張
move建議，動員 propose提議 object反對 order命令
prefer建議 require 需要 request要求 resolve下決心
recommend推薦 suggest建議 stipulate約定，規(guī)定 urge強調，促進
vote公認，提議 decree頒布(法令) pray請求
注意：這類動詞后面除了可接that虛擬句以外，也可以接doing或者to do…來表達，一般情況下，意思沒有什么差別。
She advised that we should keep the gate locked.(書面體)
She advised us to keep the gate locked.(口語)
She advised keeping the gate locked.(較隨便)
B、用于It is+形容詞或過去分詞+主語從句中，這類形容詞或分詞有：
advisable合理的 decided決定的 crucial關鍵的 appropriate恰當?shù)?/p>
determined決定的 commanded命令的 arranged安排的 essential緊要的，基本的
complied遵照 anxious焦急的 imperative迫切的 important重要的
desirable合意的 better較好的，更好 insistent堅持的 desired想要
asked請求 keen渴望的 incredible難以置信的 adamant堅定不移的
natural自然的 insisted堅持 necessary必要的 suggested建議
urgent緊迫的 ordered命令 shocked震驚的 vital極其重要的
possible可能的 strange 奇怪的 preferable (好一點) proposed提議
requested要求的 required要求的 recommended推薦 resolved決定的
probable(可能的) pity可惜，憾事 shame遺憾
注意：這類形容詞后面除了可接that虛擬句以外，也可以for…to do…
來表達，一般情況下，意思沒有什么差別。
It is essential that he should be prepared for this.
It is essential for him to be prepared for this.
C.用于由表示建議、要求、命令、請示等含義的名詞引導的表語從句和同位語從句中，這類名詞常見的有：
advice忠告 decision決定 demand要求 desire要求、愿望
insistence堅持 motion提議 necessity必要性 order命令
preference偏愛 proposal提議 pray懇求 recommendation推薦
request要求 requirement要求 resolution決心 suggestion勸告、忠告
例如：
This is their resolution that extra-curriculum activities be made part of their school life.這是他們的決議：要使得課外活動成為他們學校生活的一部分。
The motion that the remark of the last speaker be expunged from the record.該提議要求把后一個發(fā)言的人的講話從記錄上除掉。
【篇二：混合虛擬語氣】
有時主句和從句的謂語動詞指不同的時間，這時需要用混合虛擬語氣。一般來說，在這種情況下，主從句謂語動詞指代的時間不同，所以我們又可以錯綜時間條件句，在這種虛擬情況，動詞形式應根據(jù)實際情況靈活使用，在做這些題目時候尤其要注意每道題目的提示語：時間狀語。絕大多數(shù)情況下，從句或者主句都有相關的時間狀語，這是我解題的關鍵。
If you that late movie last night, you wouldn’t be so sleepy.
A. haven’t watched
B. didn’t watch
C. hadn’t watched
D. wouldn’t have watched 答案選C。
Many dead would now be alive if they have not attempted to return for something.
Had Paul received six more votes in the last election, he would be our chairman now.
混合虛擬語氣還有一種情況就是事實和虛擬假設的混合句，這樣的句子不僅僅是時間的不同，而重要是事實和假設的混合。
I would have gone to visit him in the hospital had it been at all possible, but I was fully occupied the whole of last week.
該句前半部分是假設虛擬，而后半部分是事實的陳述。
Your math instructor would have been happy to give you a make-up examination had you gone and explained that your parents were ill at the time.
該句前半句用的是假設虛擬，后半句主句也用的是假設虛擬(如果你去并且解釋的話)，但是后半句的從句用的是事實語氣，因為“父母病了”是客觀事實，故不需要用虛擬形式had been。
【篇三：含蓄虛擬條件句】
含蓄條件句是指句中沒有明顯的虛擬條件句，而是利用其他手段來暗示存在虛擬條件。但是這類隱含式虛擬條件句往往都可以轉化為if引導的條件句。常來表示含蓄虛擬條件的手段有：
(1)介詞或介詞短語，如but for, but that, without, in case of, under more favorable condition等。
the leadership of the party, we could not be living a happy today.=If there hadn’t been the leadership of the party, we could not be living a happy today.
A. In spite of
B. But for
C. Because of
D. As for 答案選B。
But that she was afraid, she would have said no.
(2)連詞，如：so that, unless, in case, supposing, lest, provided(倘若……)，for fear that(唯恐)，in order that, on condition that, if only(要是……就好了)等。
She listened carefully in order that she might discover exactly what he wante
D.=if she listened carefully ,she might discover exactly what he wante
D.
If only I had more money, I could buy a car.
(注：lest, for fear that 和 in case 引起的從句中謂語動詞多用should+動詞原形，但可以不用虛擬語氣，而用動詞的陳述語氣形式。)例如：
The foreign teacher spoke slowly in case we misunderstood him. 這位外籍教師說得很慢以免我們聽不懂。
Care must be taken in using this method lest overflow should occur.在使用此法時要小心謹慎，以免會發(fā)生溢流現(xiàn)象。
(3)通過上下文及內(nèi)在含義，句中往往有but, otherwise, unfortunately等類似轉折詞。
I thought the children when we returned home, but they were still awake.
A. were sleeping
B. would be sleeping
C. had been sleeping
D. would sleep選擇 B。
(4)形容詞及其比較級
A more careful person would not have made so many mistakes.
A less conscientious man wouldn’t have tried so hard to get this job done.
(5)分詞短語
Having known in time, we might have prevented the accident.
Born ten days earlier, the boy could have seen his late father.
(6)動詞不定式短語。一般intended/meant/hoped/wished/planned 或 was/were+不定式完成式或had intended/meant/planned/hoped/wished/+不定式一般式表示虛擬。
I intended I should call on you, but I was busy at that time.
To hear him speak French, you would take him for an Englishman.
She would be stupid not to accept his invitation.
It would be easier to do it this way.
(7)名詞短語和名詞+and結構
A judicious man would not have committed suicide.
A diligent student would have worked harder.
(8)獨立主格結構
All things considered, the price would be reasonable.
(9)定語從句
Anyone who had been in your position would have done the same.
A nation, which stopped working, would be dead in a fortnight.
(10)情態(tài)動詞完成式暗示虛擬語氣：
I should have called to make an airline reservation, but I didn’t.
The porter ought to have called the fire-brigade as soon as he saw the fire in the stock, which went up in smoke.
(11)動詞原形表示虛擬
動詞原形直接用在句子中也被看作是一種虛擬，常見于正式文體中，動詞原形一般用在條件從句中，有時倒裝置于句首，同時這種用法也常見于獨立句中表達愿望。
God bless you!
All magnets behave the same, be they large or small.
She’ll be sixteen years odd, com May.(come May =when May come).
If that be so, we shall take action at once
