专四语法解析
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.
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。
复合句——副词性(状语)从句
副词在句中起状语作用，故如果起状语作用的部分为一个句子，那么该句便是副词性从句，也称状语从句。状语从句可细分为：时间、地点、条件、原因、让步、目的、结果、比较、方式等。
状语从句的测试重点为：考查考生对主从句之间逻辑意义关系的把握，看其是否能选择正确的从属连词。
1.条件状语从句的常考知识点
(1)if与unless的用法。if和unless都是引导条件状语从句的连词，考生应尤其注意unless 的用法，因为它表示反面条件，相当于if not“如果不”、“除非”。如：In debating, one must cor rect the opponent’s facts, deny the relevance of his proof, or deny that what he presents as proof, if relevant, is sufficient.
(2)复合连词as long as，so long as，as far as，on condition that，in the event that；动词及分词provided(that)，providing(that)，given that,
suppose/supposing(that)，assuming，say等引导条件状语从句。如：
You can arrive in Beijing earlier for the meeting provided you don’t mind taking the night train.
Assuming he is diligent in his studies at ordinary times, he is sure to pass the test.
In the event that she has not been informed, I will tell her. (如果……)
You can go swimming on condition that you don’t go too far from the river bank. (如果……)
Suppose it rained, we would still go. (假如……) Say it were true, what would you do about it? (假如……)
(3)祈使句表示条件。如：Dress warmly, or else you’ll catch cold.
Talk to anyone in the drug industry, and you’ll soon discover that the science of genetics is the biggest thing to hit drug research since penicillin was discovered.
2.让步状语从句的常考知识点
(1)as 引导让步从句，要求用倒装结构，把强调的部分置于句首。如：Much as he likes her, he does get irritated with her sometimes.
Humble as it may be, there is no place like home.
(2)while引导让步从句。如:
Everybody cheats a little, some psychologists say, while others insist that most people are basically honest and some wouldn’t cheat under a ny circumstances.
(3)复合连接词for all that和分词granting/granted(that)引导让步从句。如:
Granted you have made much progress, you should not be conceited.
For all that computers can provide us with great help, they shouldn’t be seen as substitutes for fundamental thinking and reasoning skills.
3.时间状语从句的常考知识点
(1)before表示汉语的“只有/必须……才能”。如: New ideas sometimes have to wait for years before they are fully accepted.
(2)when引导时间从句时，如果出现在后半句，则表示“这/那时突然”。如：
I have just started back for the house to change my clothes when I heard the voices.
(3)when it comes to 是习惯用法，意为“当谈到……时”。如：
Doing your homework is a sure way to improve your test scores, and this is especially true when it comes to classroom tests.
(4)名词短语、介词短语each /every time, the moment/second/minute, in the time, by the time起连词作用。如:
I hope her health will have improved greatly by the time we come back next year.
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?”
Mercury’s velocity is so much greater than the Earth’s that it completes more than four revolutions around the Sun in the time it takes the Earth to complete one.
(5)副词directly, immediately, instantly, now引导时间从句, 相当于as soon as。如: The policemen went into action directly they heard the alarm.
4.原因状语从句的常考知识点
(1)in that引导原因从句时,有时翻译成“是因为”、“就在于”。如:
Advertising is distinguished from other forms of communication in that the advertiser pays for the message to be delivered.
Criticism and self-criticism is necessary in that it helps us to find and correct our mistakes.
(2)now that表示“既然”; seeing that, considering表示“鉴于”、“考虑到”。如: Now that we have all the material ready, we should begin the new task at once.
He did poorly in the examinations, considering how hard he had tried for them.
Seeing t hat she is lawfully old enough to get married, I don’t think you can stop her.
其他引导原因状语从句的连接词语还有: for the (simple) reason that, by reason that, on the grounds that, in as much as, in so far as等。
5.while, whereas 引导对比从句
如: While the teenage population in the United States has declined over the past decade, violent crimes committed by juveniles have sharply increased.
A baby might show fear of an unfamiliar adult, whereas he is likely to smile and reach out to another infant.
6.so…that…, with the result that, so much so that 引导结果状语从句
如: Over the years, a large number of overseas students have studied at that university with the result that it has acquired substantial experience in dealing with them.
He himself believed in freedom, so much so that he would rather die than live without it.
7.in order that, in case, for fear that, lest (用虚拟语气) 引导目的状语从句如: Give me your telephone number, in case I need your help.
Helen listened carefully in order that she might discover exactly what John wanted.
8.where作为连接副词的一种用法, 翻译为“在……地方”
如: In Japan, a person’s capabilities are not forced into an inflexible specialty. Where there is willingness and intelligence, there is a place within the company to try and to succeed.
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 cry ing 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.
定语从句中关系代词that的用法
(1)在既指人又指事物的两个或两个以上的先行词后面。例如：
They are talking about the people and countries that they had visited.
(2)在限制性定语从句中有形容词最高级的先行词后面。例如：
He is the best student that I have ever met.
(3)在以“It is...”,“It was...”等开头的强调句中，和相应的疑问句中。如：
What is it that he wants?
(4)在only, all, little的后面
This is all that I know.
(5)在no, every, some和any等词后面，也包括在它们的复合词在内。如：
There is no person that is always in the right.
Is there anything that I can do for you?
近义词辨析
beautiful, good looking, handsome, lovely, pretty
这组词均含有“美丽”、“漂亮”、“可爱”的意思。
beautiful
指能不仅给人带来感官上的快乐，而且通过感官产生思想和灵魂的愉悦，在同类词中层次最高。
She was even more beautiful than I had remembered.她比我记忆中的她更漂亮了。good looking
不如handsome, pretty意思强烈，指一般的“好看”或“悦目”。
That good looking young man visited the house once or twice a week.那个长相不错的年轻人一星期光顾一两次。
handsome
通常是一种客观的不带感情色彩的评价。一个人如被形容为handsome,是指此人外貌符合观察者的要求，但不激发更深层的感受。
He looked very handsome in his dark suit.他穿深色西装显得非常英俊。
lovely
比感官的快乐更进一步，是强调纯粹情感上的愉悦，指觉得某人或某物“可爱”。
Mary has two lovely daughters.玛丽有两个可爱的女儿。
pretty
pretty也是“漂亮、可爱”的意思。很少形容大而有影响力的事物，多形容事物不以其优秀、完美而以小巧、优雅、精致见长，使人容易接受并喜爱。
Her boyfriend believes that she is the prettiest girl in the town.她男朋友觉得她是镇上最漂亮的女孩。
关于dare的意义和用法
作为情态动词表示“胆敢”，dare通常只用于否定陈述句和疑问句。例如：
I dare not go there.
How dare he say such rude things about me?
dare作为情态助动词没有过去式形式，其否定式为daren’t，既可指现在时间，也可指过去时间。
例如：
Tom wanted to come, but he daren’t.
dare还可用主动词，随后的不定式可带to,也可不带to。例如：
He does not dare (to) answer.
Does she dare (to) go there alone?
近义词辨析
besides, but, except, except for
这组词均含有“除…外”的意思。
besides
“除…外，还有…”，指更进一步的拥有，包括所“除”事物在内。
Have you got any clothes besides these?除了这些衣服你还有别的吗?
but
不包括所引事物在内，多与nothing, not anything, nobody, nowhere, all, anybody 等连用。
He has nobody but himself to blame for that.那件事他没法指责别人，只能怪他自己。except
不包括所引事物。常与no, none, nothing等否定词或all, everyone, everything等连用，但不可用于句首。
They all went to the Summer Palace except one.除一人之外他们都去了颐和园。except for
常指除去所引情况让人稍感遗憾之外，整体情况尚属理想，被除去的事物与正在谈及的事物之间不具有共同属性或性质。
The roads were clear except for a few cars.除几辆小汽车外，路面很空旷。
关于used to的意义和用法：
used to (只有过去时形式，没有现在时形式)表示过去习惯动作或状态，这种情况现已不复存在。例如：
He used to smoke a lot, but he has long given up smoking.
在否定陈述句或否定疑问句中，用didn’t use to或usedn’t to均可：
He didn’t use to smoke cigarettes.
He usedn’t to smoke cigarettes.
Didn’t Maria use to be interested in the theatre ?
Usedn’t Maria to be interested in the theatre ?
在肯定疑问句中也可有两种形式：
Used you to go to the same school as Edward ?
Did you use to go to the same school as Edward ?
近义词辨析
use, apply, avail, employ, utilize
这组词均含有“使用”或“利用”之意。
use
强调利用人或物作为工具。
He used up all his resources in experimenting with the new paint.他为实验新的涂料，花光了一切钱财。
apply
指把某物或某种方法、原理等加以应用。
We should not only know the theory but also know how to apply it to practice.我们不仅要知道理论，还要知道怎样把理论应用于实践。
avail
指使用就近的或他人给予的东西，或使别人为自己提供服务。
I don’t think complaints will avail you much.我觉得抱怨对你没多大用处。
We avail ourselves of every opportunity to speak English.我们利用一切机会讲英语。
employ
指使用未被利用的东西；用于人时表示雇用。
He doesn’t know how to employ his energy and time.他不知道该怎么利用他的精力和时间。
utilize
指充分发挥某物的作用，使无用的东西变有用，或使人或物有新用途。
She hopes to utilize her artistic talents in the job.她希望在工作中发挥她的艺术才能。
专四语法考点-非谓语动词资料
专四语法考点-非谓语 动词
专四语法考点：非谓语动词 考点1：不定式专四题中对于不定式用法的考察比较少，特别是近些年的考题几乎已经不考了。以前的考点基本集中在： (1)考察哪些动词接不定式； (2)考察哪些短语接不带to的不定式； 1) can’t help/choose but do不得不,只能,不禁 2) why not do sth 1. ________him tomorrow?2001 A. Why not to call on B. Why don’t call on C. Why not calling on D. Why not call on 3) would do rather than do 1.She said she would work it out herself,________ ask me for help.1993 A.and not to B.but not C.and prefer not D.rather than (3)考察短语"be believed/said to do sth"的用法； 1. The Minister of Finance is believed ________ of imposing new taxes to raise extra revenue.2004 A. that he is thinking B. to be thinking C. that he is to think D. to think 2. AIDS is said________the number-one killer of both men and women over the past few years in the region.2002 A. being B. to be C. to have been D. having been 3. Professor Johnson is said ________some significant advance in his research in the past year. 1999 A. having made B. making C. to have made D. to make (4)考察动词不定时的时态和语态：进行式to be doing,完成式to have done;一般式被动语态to be done;完成式被动语态to have been done。另外，不定式短语有将来时的意思； 考点2：动名词 （1）常接动名词做宾语的词：mind(介意), miss(逃过), mention(提及), prevent, postpone, practice, risk(冒险), resist(抵制), consider(考虑), admit(承认), avoid(避免), appreciate(感激), fancy(幻想), finish(完成)，feel like(喜欢), escape(逃脱), ensure(确保) , delay(延迟), deny(否认), resent, detest, imagine(想象), suggest(建议) 1. In international matches, prestige is so important that the only thing that matters is to avoid________. 1996 A. from being beaten B. being beaten C. beating D. to be beaten
(完整版)历年专四真题语法归类
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