虚拟语气
1.主从句谓语动词的时态
(1)掌握主从句谓语动词的规范搭配：
主句 从句
与现在事实相反would/情态动词过去式+do were (不分人称)/did
与过去事实相反would/情态动词过去式+have done had done
与将来事实相反would/情态动词过去式+do should do / were to do
如：If the doctor had been available, the child could not have died.
There is a real possibility that these animals could be frightened, should there be a sudden loud noise.
(2)区分主从句表示的不同时间概念：
主从句谓语动词所指时间不同，这叫做错综时间条件句，动词形式应根据实际情况来调整。如：
Had it not been for the timely investment from the general public, our company would not be so thriving as it is.
(主句与现在事实相反，从句与过去事实相反)
Had Paul received six more votes in the last election, he would be our chairman now.
(主句与现在事实相反，从句与过去事实相反)
(3)识别事实和假设混合句：
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.(句子前半部分为假设情况，而“父母病了”是事实)
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.
前半部分为假设，后半部分是事实)
2.名词性从句的虚拟形式
名词性从句是指宾语从句、主语从句、表语从句和同位语从句。从句的谓语动词需用(should+)动词原形表示虚拟。考生应熟悉：
(1)下列动词做谓语时，that宾语从句中的动词用虚拟形式：desire, advise, recommend, command, direct, order, ask, demand, request, require, insist, maintain, move, propose, prefer, urge, vote。如：I move that he be discharged for his serious mistake.
In the past men generally preferred that their wives work in the home.
(2)下列形容词和分词做表语或补语时，that主语从句中动词用虚拟形式：advisable, desirable, insistent, preferable, urgent, appropriate, compulsory, crucial, essential, imperative, important, necessary, obligatory, possible, probable, proper, vital, advised, arranged, commanded, demanded, desired, ordered, proposed, recommended, requested, required, suggested。如：
The board deem it urgent that these files should be printed right away.
It is essential that all these figures be checked twice.
(3)下列名词接同位语从句或表语从句时，从句中动词用虚拟形式：insistence, preference, recommendation, suggestion, proposal, motion, desire, requirement, request, order, necessity, importance, regulation, rule, resolution, understanding。如：
John Wagner’s most enduring contribution to the study of Afro-American poetry is his insistence that it be analyzed in a religious, as well as worldly, frame of reference.
They keep telling us it is of utmost importance that our representative be sent to the conference on schedule.
3.含蓄虚拟条件句的谓语动词形式
含蓄虚拟语气是指假设条件不通过if从句表达，而是暗含在其他结构中。考生应熟悉：
(1)连词but, but that, or, or else；副词otherwise, unfortunately等表示转折假设。如：
A safety analysis would have identified the target as a potential danger. Unfortunately, it was never done.
Victor obviously doesn’t know what’s happened; otherwise he wouldn’t have made such a stupid remark.
(2)介词短语暗含假设条件，常用的有：without, but for, under more favorable conditions等。如：
But for the English examination I would have gone to the concert last Sunday.
(3)intended/meant/hoped/wished/plann或was/were +不定式完成式或had
intended/meant/planned/hoped/wished +不定式一般式暗示虚拟语气。如：I intended to have called on you, but I was busy at that time.
(4)情态动词完成式暗示虚拟语气。如：I should have called to make an airline reservation, but I didn’t.
4.常用虚拟形式的句型
(1)从句中动词用过去式或过去完成式表示虚拟的句型：
would rather would as soon as though suppose…
had rather would sooner as if supposing…
If only…It is (high) time that…(从句中动词只用过去式)
如：His wife would rather they didn’t talk about the matter any more.
I’d rather you went by train, because I can’t bear the idea of your being in an airplane in such bad weather.
If I were in a movie, then it would be about time that I buried my head in my hands for a cry.
My father always talks as though he were addressing a public meeting.
(2)If it were not for…(与现在事实相反) If it had not been for…(与过去事实相反) 相当于but for。如：
If it had not been for his help (= but for his help), we would not have succeeded.
(3)If only…谓语动词视情况选用适当的形式。如：
If only the committee would approve the regulations and put them into effect as soon as possible.
(4)lest/for fear that/in case 从句谓语用(should+)动词原形。如：
The mad man was put in the soft-padded cell lest he injure himself.
(5)whether…or…有时谓语用be的原形，引导让步虚拟从句，这种用法经常采用倒装结构。如：
Church as we use the word refers to all religious institutions, be they Christian, Islamic, Buddhist, Jewish, and so on.
The business of each day, be it selling goods or shipping them, went quite smoothly. 非谓语动词的其他考点
1.接不定式或动名词做宾语都可以，但在意思上有区别的动词的用法
mean to do想要(做某事) mean doing意味(做某事) propose to do 打算(做某事) propose doing建议(做某事)
forget to do忘记(要做的事) forget doing忘记(已做的事) remember to do记得(要做某事) remember doing记得(做过)
go on to do继而(做另一件事) go on doing继续(做原来的事) stop to do停下来去做另一件事stop doing停止正在做的事
regret to do(对将要做的事)遗憾regret doing(对已做过的事)后悔
2.不定式的习惯用法
句型：cannot help but do cannot but do cannot choose but do can do nothing but do have no choice/alternative but to do上述句型的意思接近，即“不得不做”、“不禁做”、“不由自主地做”、“不能不做”、“只能做”。如：
Nobody can help but be fascinated by the world into which he is taken by the science fiction.
When I consider how talented he is as a painter, I cannot help but believe that the public will appreciate his gift.
3.动名词的习惯用法
句型：be busy/active doing sth. have difficulty/trouble/problem doing sth. It’s no
good/use/picnic doing sth. have a good/great/wonderful time doing sth. spend/waste time doing sth. There is no point/sense/harm/ use doing sth.
cannot help doing sth. There is no doing sth.
I know it isn’t important but I can’t help thinking about it. There is no use crying over spilt milk.
Alice was having trouble controlling the children because there were so many of them.
4.there be 非谓语动词的用法
(1)做宾语时取决于谓语动词的持续要求。如：
The students expected there to be more reviewing classes before the final exams.(expect要求接不定式做宾语)
(2)做目的状语或程度状语时用for there to be，做其他状语用there being。如：
For there to be successful communication, there must be attentiveness and involvement in the discussion itself by all present.
(for there to be…在句中做目的状语)
It isn’t cold enough for there to be a frost tonight, so I can leave Jim’s car out quite safely. (for there to be…在句中做程度状语)
There being no further questions, we’ll stop here today. (there being…做原因状语)
(3)引导主语用for there to be。如：It is unusual for there to be no late comers today.
(4)做除for外的介词宾语，用there being。如：
He would always ignore the fact of there being such a contradiction in his inner thought. 不定式
1.不定式做主语
(1)引导逻辑主语的介词：不定式的逻辑主语一般由介词for引导,但下列表示人的性格行为特征的形容词做表语时, 不定式的逻辑主语则由of引导：absurd, bold, brave, courageous, careful, careless, clever, wise, foolish, silly, stupid, good, nice, kind, thoughtful,
considerate, greedy, generous, honest, modest, polite, rude, cruel, selfish, lazy, wicked, wrong。如：
Experts say walking is one of the best ways for a person to stay healthy. It’s clever of you to have invented such a device.
(2)不定式做主语补足语：
掌握常用不定式做主语补足语的句型。注意不定式表示的动作发生的时间，并采用相应形式。如：be said / reported / thought / believed / known / supposed + to do sth.
2.不定式做宾语
掌握要求接不定式做宾语的动词：
afford, arrange, attempt, claim, desire, determine, expect, fail, guarantee, endeavor, intend, pledge, pretend, resolve, request, swear, tend, venture。如：
Even though the children pretended to be asleep, the nurses were not deceived when they came into the room.
3.不定式做定语
(1)被修饰的名词前有序数词、形容词最高级或next, last, only, not a, the, very等限定词时，该名词用不定式做定语。如：the first woman to set foot on the moon 第一个登上月球的女性
(2)如果其动词要求不定式做宾语，相应的名词一般用不定式做定语。如：
tendency to do→tend to do, decision to do→decide to do
This book is an attempt to help you use English and recognize how it is used.
(3)如果其形容词形式要求接不定式做补语，相应的名词一般用不定式做定语。如：
ambition to do “干……的雄心”→be ambitious to do“有雄心干……”curiosity to do “对……的好奇心”→be curious to do“对……好奇”
ability to do“做……的能力”→able to do“有能力做……”
According to Darwin, random changes that enhance a species’ ability to survive are naturally selected and passed on to succeeding generation.
(4)表示方式、原因、时间、机会、权利等名词用不定式做定语，这些名词包括：
way, method, reason, time, place, chance, occasion, opportunity, evidence, power, right, movement, drive (运动)，effort等。如：I worked so late in the office last night that I hardly had time to catch the last bus.
We appreciate your efforts to bring about a comprehensive solution to the existing problem.
(5)不定代词something, nothing, little, much, a lot习惯上用不定式做定语。如： Though we have made great progress, there is still much to be improved.
4.不定式做状语
不定式做状语主要表示目的、程度、结果、方式。
(1)in order to(do), so as to(do)结构引导目的状语，so as to不能置于句首。
(2)so…as to, such…as to, enough…to, too…to结构做程度状语。如：
The solution works only for couples who are self-employed, don’t have small children and get along well enough to spend most of their time together.
The vocabulary and grammatical differences between British and American English are so trivial and few as hardly to be noticed.
(3)不定式做结果状语只能出现在句子的末尾，表示不愉快的结果，有时用only加强语气。 常见的不定式动词有find, hear, see, be told, form, give, make, produce等。如： Greatly agitated, I rushed to the apartment and tried the door, only to find it locked.
(4)not/never too…to, too…not to, but/only too…to, too ready/eager/apt/inclined to 表示肯定意义。如：
I am only too pleased to hear from you further. 能再听到你的消息，我太高兴了。 集体名词作主语主谓一致
1)通常作复数的集体名词
集体名词，如：police, people, cattle, militia, poultry等，
通常作复数，用复数动词。如：
Domestic cattle provide us with milk, beef and hides.
2)通常作不可数名词的集体名词
有些集体名词，如foliage, machinery, equipment, furniture, merchandise,通常作不可数名词，随后的动词用单数。例如：All the machinery in the factory is made in China.
3)既可作单数也可作复数的集体名词
集体名词，如audience, committee, class, crew, family, public, government等，既可作单数，也可作复数用。
The city council is meeting to set its agenda.
4) a committee, etc. of +复数名词
如果主语是由“a committee of /a panel of /a board of +复数名词”构成，随后的动词通常用单数。
例如：A committee of five men and three women is to consider the matter.
近义词辨析
tired, exhausted, fatigued, weary, worn out
这组词均含有“疲惫的”的意思。
tired
可指因体力或脑力消耗太多而需要休息，还可指因长期做某事而失去兴趣。
Henry was so tired that he went to bed immediately after he got home.
亨利很疲惫，一到家就上床睡觉去了。
exhausted
表达的疲惫程度最强，指因劳累过度而精疲力竭。
The exhausted engineer fell asleep on the bus.
精疲力竭的工程师在公共汽车上睡着了。
fatigued
所表达的疲劳程度比tired和weary强，表示由于过度劳累而引起疲乏，不能再继续下去。 He felt fatigued and didn’t want to say a single word.
他疲惫不堪，不想说一句话。
weary
语气比tired强，指由于长时间努力工作或由于做单一的事而引起疲倦。
After a long and weary wait, the plane finally came to take them back.
经过漫长而又令人疲乏的等待后，飞机终于来接他们回去了。
worn out
词不太正式，多用于口语。
The troops were worn out after winning the battle.
战后，部队疲惫不堪。
情态动词
注意情态动词完成式的用法有两方面的含义：
1.表示已经发生的情况
(1)must have +过去分词，表示对已发生情况的肯定推测，译为“(昨天)一定……”。如：My pain must have been apparent the moment I walked into the room, for the first man I met asked sympathetically: “Are you feeling all right?”
(2)can’t/couldn’t have +过去分词，表示对已发生情况的否定推测，译为“(昨天)一定没……”。 如：
Mary couldn’t have received my letter; otherwise she would have replied before now.
(3)may/might have +过去分词，表示对已发生的事情做不肯定、可能性很小的推测，或事实上根本没发生，译为“也许……”。如：At Florida Power’s Crystal River plant, a potentially serious leakage of radioactive water may have been unknowingly caused by an electrician.
2.表示虚拟语气
(1)needn’t have+过去分词，表示做了不必做的事，译为“其实没必要……”。如： As it turned out to be a small house party, we needn’t have dressed up so formally.
(2)should /should not have +过去分词，表示应该做某事但实际上未做，或本不应该做但实际上做了, 译为“本(不)应该……”。如：I regret having left the work unfinished; I should have planned everything ahead carefully.
(3)ought to have+过去分词，表示动作按理该发生了，但实际上未发生，译为“该……”，与should的完成式含义类似。如：
The porter ought to have called the fire-brigade as soon as he saw the fire in the stock, which went up in smoke.
(4)could have+过去分词，表示过去本来可以做但却未做，译为“完全可以……”。如： What you said is right, but you could have phrased it more tactfully.
(5)may/might have + 过去分词，表示过去可以做但实际未做，译为“(那样)也许会……”。如： It might have been better to include more punchy statistics and photos of equipment in the introduction to further assist first-time office automation managers.
3.几个情态动词常考的句型
(1)may/might (just) as well“不妨，最好”，与had better相近。如：Since the flight was cancelled, you might as well go by train.
(2)cannot/can’t…too… “越……越好，怎么也不过分”。注意这个句型的变体cannot…over…。如：
You cannot be too careful when you drive a car.
The final chapter covers organizational change and development. This subject cannot be overemphasized.
(3)usedn’t或didn’t use to为used to (do)的否定式。
(4)should 除了“应该”一层意思外，大纲还规定要掌握其“竟然”的意思。如：I didn’t expect that he should have behaved like that.
英语专四语法总结——时态、语态
1.表达将来时的形式：
(1)在时间、条件、让步从句中，一般现在时代替将来时，但要注意区别从句的类型，如： I’ll tell him when you will ring again. (宾语从句) 比较：I’ll tell him when you ring again. (状语从句)
(2)在make sure, make certain, see (to it) 后的that从句中，谓语动词用一般现在时代替将来时，如：
See to it that you include in the paper whatever questions they didn’t know the answer to last time.
(include 不能用will include或其他形式)
2.完成时是时态测试的重点，注意与完成时连用的句型和时间状语：
(1)by/between/up to/till +过去时间、since、by the time/when +表示过去发生情况的从句，主句用过去完成时。如：We had just had our breakfast when an old man came to the door. Between 1897 and 1919 at least 29 motion pictures in which artificial beings were portrayed had been produced.
(表示19xx年时已发生的情况)
(2)by +将来时间、by the time/ when +谓语动词是一般现在时的从句，主句用将来完成时。如：
By the time you arrive in London, we will have stayed in Europe for two weeks. I hope her health will have improved greatly by the time we come back next year.
(3)by now、since +过去时间、in/during/for/over/the past/last few(或具体数
字)years/days/months，主句用现在完成时, 但在it is +具体时间since/before这一句型中，主句更多的时候不用完成时。如：
The changes that had taken place in air travel during the last sixty years would have seemed completely impossible to even the most brilliant scientists at the turn of the 19th century. It is four years since John left school.
(4)在It is the +序数词/形容词最高级+that的定语从句中，谓语动词常用现在完成时。如： It isn’t the first time that I have found myself in an embarrassing situation.
(5)在no sooner…than…, hardly/scarcely…when…句型中，主句常用过去完成时。
3.完成进行时指动作在完成时的基础上还要继续下去。如：
The company has been promising a rise in salary for ages, but nothing has happened. 复合句——名词性从句
一个句子起名词的作用，在句中做主语、宾语／介词宾语、表语、同位语，那么这个句子就是名词性从句。
1.what/whatever的用法 考生应把握：what是关系代词，它起着引导从句并在从句中担当一个成分这两个作用。如：
They lost their way in the forest, and what made matters worse was that night began to fall.
(what既引导主语从句又在从句中做主语)
Water will continue to be what it is today—next in importance to oxygen. (what既引导表语从句又在从句中做表语)
2.whoever和whomever的区别
whoever和whomever相当于anyone who，用主格与宾格取决于其在从句中做主语还是做宾语。如：
They always give the vacant seats to whoever comes first. (whoever在从句中做主语)
3.有关同位语从句的问题
(1)引导词通常为that, 但有时因名词内容的需要，也可由whether及连接副词why, when, where, how引导。that不表示任何意义，其他词表示时间、地点、原因等。如：The problem, where I will have my college education, at home or abroad, remains untouched.
(2)同位语从句有时与先行词隔开，注意识别。如：
Evidence came up that specific speech sounds are recognized by babies as young as 6 months old.
4.whether与if在引导名词性从句时的区别
(1)主语从句只能用whether引导；
(2)whether一般多用于宾语从句的肯定式，而if引导的从句可以有否定式；
(3)whether or not可以连在一起用，而if or not则不能，or not只能放在句末；
(4)whether可以引导介词宾语从句，if则不能；
(5)宾语从句提至谓语前面时，只能用whether引导；
(6)在question, ask后面一般只用whether，question的同位语从句也用whether引导；
(7)后接不定式时，只能用whether。
5.动词believe, expect, fancy, imagine, suppose, think后的宾语从句如为否定式，一般将否定词转移到主句谓语上。
应用文写作：
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I must apologize for….
? I am writing to apologize for
? Much to my regret that I may not be able to keep my promise because… ? I trust my absence will not cause you any serious inconvenience.
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I hope you are not too busy to come. We faithfully hope you can attend. Please confirm your participation at your earliest convenience. We should be very glad if you could join us. Congratulations on your success/ achievements! Heartiest congratulations upon your… We take this opportunity to express our best wishes to you. Allow me to offer my heartiest congratulations. I was sorry to learn that 点明要慰问的事情. My kindest regards and best wishes. Our deepest sympathy is with you. We are shocked at the sad news that…
常用句型(正式邀请)
1. We are pleased to invite… to visit…
2. You are warmly invited to attend…
3. Please confirm that you will be able to attend…
4. We would like to invite you to a reception in honor of…
5. It would give us great pleasure to have your presence at the ceremony to hold on Tuesday at Royal Hotel.
6. On behalf of ?, I am pleased to invite you…
7. It would be a great honor to have your presence at the dinner.
1. That's very kind of you, but I'm afraid that I'm tied up on Saturday.
2. I'd like to, but I'm already booked up for next Saturday.
3. I wish I could, but I have an appointment on Saturday.
4. Thanks for asking me, but I am going to be out of town that evening.
5. I would like very much to join you another time.
1. I feel that it would be beneficial if......
2. I would like to suggest that.....
3. I would recommend that........
4. It would seem to me that you could.....
1. I would be most grateful if you could send me information concerning.....
2. I am writing to see if it is possible for you to provide me with information regarding...
3. I look forward to your immediate response.
4. Your attention to this letter would be highly appreciated.
? Thank you for one of the most memorable days of my trip.
? Thank you so much for your generous hospitality.
? Many thanks for your kind and warm letter.
? Please accept my sincere appreciation for…
? Thank you again for your wonderful hospitality and I am looking forward to seeing you soon.
? A thousand thanks for your help and encouragement.
1. I am writing to inform you that I am dissatisfied with your.......
2. I hope you will give immediate attention to this matter.
3. I would like to have this matter settled by the end of.....