资源描述
专四必备语法一、时态、语态 时态、语态需要掌握的要点：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：Ill tell him when you will ring again. 我告诉他你什么时候再来电话。(宾语从句)比较：Ill tell him when you ring again.你再打电话时我告诉他。(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 didnt 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1919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 isnt the first time that I have found myself in an embarrassing situation.(5)在no soonerthan, hardly/scarcelywhen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.时态、语态答题思路：(1)先根据选项的区别点确定考题要点为时态，然后回到题句中寻找给出的或暗示的时间状语，缩小选择范围，进而选出正确答案；(2)根据谓语动词与句子主语或非谓语动词与其逻辑主语的关系，确定句子是主动语态还是被动语态。二、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.Its 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 dotend to do, decision to dodecide 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。如：(2)soas to, suchas to, enoughto, tooto结构做程度状语。如：The solution works only for couples who are self-employed, dont 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 tooto, 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。三、动名词1.必须接动名词做宾语的动词牢记下列要求接动名词做宾语的动词：acknowledge, advocate, anticipate, appreciate, avoid, admit, confess, consider, delay, deny, enjoy, escape, excuse, fancy, favor, finish, forgive, imagine, involve, justify, mention, pardon, practice, postpone, recall，recollect，risk, resist, suggest, tolerate。如：I appreciate having been given the opportunity to study abroad two years ago.2.动名词做介词短语考生尤其要识别下列短语中的to是介词，不是不定式符号：object to, resort to, react to, contribute to, look forward to, be accustomed to, be committed to, be exposed to, be subjected to, be devoted to, be dedicated to, be opposed to, be reconciled to, be contrary to, be (get) used to, come close to, get down to, give oneself up to, preferto, see to, set to, take to, in addition to, with regard to, with a view to, on the way to。如：四、分词分词起形容词和副词的作用，在句中做定语或状语。在概念上应清楚： 现在分词表示主动，表示动作在进行。 过去分词表示被动，表示动作结束了的状态或结果。1.分词做定语，弄清现在分词与过去分词的区别分词短语做定语相当于省略了的定语从句，考生应掌握：(1)现在分词与被修饰词之间具有主动意义。如：Its easy to blame the decline of conversation on the pace of modern life and on the vague changes taking place in our ever-increasing world.(相当于the changes which take place.)There was a very interesting remark in a book by an Englishman that I read recently giving what he thought was a reason for this American characteristic.(相当于which gave.)How many of us attending, say, a meeting that is irrelevant to us would be interested in the discussion?(相当于How many of us who will attend.)(2)过去分词与被修饰词之间具有被动意义。如：Good news was sometimes released prematurely, with the British recapture of the port announced half a day before the defenders actually surrendered. (相当于recapture of the port which had been announced)Just as the value of a telephone network increases with each new phone added to the system, so does the value of a computer system increase with each program that turns out. (相当于each new phone which is added to)The author gave a detailed description based on his personal observation of nature.(相当于description which was based on)(3)下列不及物动词也以过去分词形式做定语或表语，但不具有被动意义：deceased, departed, elapsed, faded, fallen, gone, grown-up, retired, returned, risen, set, vanished, much-travelled, newly arrived, recently come。如：an escaped prisoner一个逃犯a retired worker一位退休工人a faded curtain一个褪了色的窗帘a newly arrived student一个新来的学生2.分词做状语，注意区分分词的一般式与完成式(1)表示时间，多置于句首，注意如果分词表示的动作的时间先于谓语动词，要用完成式。如：Having completed one task, we started on another one. (complete先于start之前发生)(2)表示原因，置于句首句尾均可，根据情况有时要用完成式，有时用一般式。如：He wasnt asked to take on the chairmanship of the society, being considered insufficiently popular with all members.There seemed little hope that the explorer, having been deserted in the tropical forest, would find his way through it.(3)表示伴随、方式，置于句尾，用分词的一般式。如：Helen borrowed my dictionary the other day saying that she would return it soon.Anna was reading a piece of science fiction, completely lostto the outside world.(4)表示结果，置于句尾，用分词的一般式。如：The city found itself in a crisis situation last summer when the air conditioning on dozens of the new buses broke down, them unusable.(5)表示补充说明(同位)，置于句尾，用分词的一般式。如：The article opens and closes with descriptions of two news reports, each making one major point in contrast with the other.Ford tried dividing the labor, each worker assigned a separate task.3.分词的独立主格结构分词的逻辑主语一般为句子的主语，否则分词短语要有自己的逻辑主语，称为分词独立主格结构。分词独立主格结构只是句子的一个部分。如：All flights having been canceled because of the snowstorm, we decided to take the train.Darkness setting in, the young couple lingered on merrymaking.五、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) propose to do 打算(做某事)mean doing意味(做某事) propose doing建议(做某事)forget to do忘记(要做的事) remember to do记得(要做某事)forget doing忘记(已做的事) remember doing记得(已做过的事)go on to do继而(做另一件事) stop to do停下来去做另一件事go on doing继续(做原来的事) 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 docannot choose but do can do nothing but dohave 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.Its 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 isnt important but I cant help thinking about it.Alice was having trouble controlling the children because there were so many of them.There is no use crying over spilt milk.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 isnt cold enough for there to be a frost tonight, so I can leave Jims car out quite safely.(for there to be在句中做程度状语)There being no further questions, well 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.六、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+dowere (不分人称)/did与过去事实相反would/情态动词过去式+have donehad done与将来事实相反would/情态动词过去式+doshould 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：In the past men generally preferred that their wives work in the home.I move that he be discharged for his serious mistake.(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 Wagners 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 doesnt know whats happened; otherwise he wouldnt 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 didnt.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 supposehad rather would sooner as if supposingIf only It is (high) time that(从句中动词只用过去式)如：His wife would rather they didnt talk about the matter any more.Id rather you went by train, because I cant 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)whetheror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.七、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)cant/couldnt 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 couldnt 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 Powers 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)neednt 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 neednt 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/canttoo “越越好，怎么也不过分”。注意这个句型的变体cannotover。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)usednt或didnt 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 didnt expect that he should have behaved like that.八、形容词、副词及其比较级1.形容词的句法功能Live 直播的 lived 动词形式 living 活着的 lively 栩栩如生的 活泼的 Alone 副词（独自 仅仅）和形容（单独的 孤独的）都有 not less than 不少于 alike 相似的Very likely 很可能 多半 大概 1.enough+n.2.adj+enough 切记：不定代词+enough still less 何况 更不用说 Opshacom op 人的观点 beautiful horrible lovely nice sh 形状 long short round narrow a 新旧 old new young c 颜色 o 来源 German China m 材料 plastic metal aluminium Well 在动词后 sleepy 形容词 形容昏昏欲睡的样子 asleep 副词 睡着 比如 fall asleep 睡着了 Wide open sensitive to是“敏感的”意思，sensible of 是“明智的”意思 wary of 小心 谨慎 interesting 兴趣 conscious of 意识到 loath to the former president heavy smoker plain poet laureate 杰出的诗人 considerate 体贴的 体谅的 considerable 相当多的 重要的 可观的 run cold 做副词是彻底的 完全的 invaluable 无价的 valueless 无价值的 strange 副词形容都有 less tense presidential 总统制的 Indoor 形容词 indoors 副词 rude可以用来修饰人、思想、行为，或者修饰人所做的事情。修饰人或其思想时，意思是“粗鲁”、“没有礼貌”或“村野”；在修饰物时，表示缺乏技艺，或者由于没有合适的材料或适当的工具，做出的东西是“粗糙的”rough 在修饰人和思想、行为时，仅仅表示“粗”，比如我们常说的“大老粗”，并不含有“粗鲁”、“无礼”及“村野”的意思。在修饰物或所做的活儿时，rough表示非精心制作的，有时表示有意做的粗糙，因为只要满足了需要就行，不必做得精细；有时表示半成品， 有待继续加工；有时制作人为了表示谦虚，把自己完成的工作说成rough workcrude的原义是“天然状态的”，在修饰物时指的是“未加工的”、“粗糙的”。在修饰人或思想、行为时，指的是“未开化的”、“低级的”、“粗鲁的”raw在修饰物时，意思是“生的”（即未加工处理的）、“未熟的”。如raw meat（生肉），raw eggs（生蛋），raw material（原材料），raw hides（生牛皮）等等。在修饰人及思想、行为时，raw指的是“未成熟的”、“无经验的”、“不老练的”coarse在修饰物时，其“粗糙的”含义实际上指的是“精细的”(fine)的反义词。如coarse sand（粗砂），fine sand（细砂），coarse cloth（粗布），fine cloth（细布）；在修饰人及思想行为时，主要指“粗俗的”而言die 是不及物动词，表示“死”、“死亡”。例如： The man died of cancer.这男人死于癌症。 Flowers soon die if they are left without water.花如果不浇水，不久就会枯死。 dead 是形容词，表示“死的”、“无生命的”。例如： He has been dead for five years.他已死了年了。 Its dead matter.那是无生命的物质。 Well never forget the dead.我们将永远不会忘记死者。（dead前面加定冠词，表示死亡的人）。 death 是名词，表示“死”、“死亡”。例如： His mothers death was a great blow to him. 他母亲的去世对他打击很大。 Several children were burnt to death. 几个孩子在大火中被烧死。 deadly 有两种词性。用作形容词时表示“致命的”、“致死的”；用作副词时表示“如死一般地”。例如： Its deadly poison.那是致命的毒药。（形容词） They have deadly weapons.他们有致命的武器。（形容词） Its deadly quiet.死一般地静。（副词） lonely 和lone 都是形容词 没有alonely 这个词rarely,很少地，难得地，少见地seldom,表示频率，很少，不常，反义词oftenhardly 几乎不，简直不= almost not ,强调困难 常和情态动词can,could连用，如could hardly see几乎看不见。scarcely = hardly 几乎不，简直没有，仅仅，刚刚,用在be/助动词后，强调数量和程度的不足barely 仅仅，刚刚，几乎不能，强调勉强够数Much 能修饰比较级 more 只能修饰原型 much better much more beautiful fast 副词 迅速地 紧紧地 merely意为“仅仅，只，不过”，表示肯定意义，如be merely the beginning，仅仅是个开头。barely意为“仅仅，刚好，正好”，表示肯定意义，常和enough,sufficient等词连用，如be barely enough勉强够。barely adv.仅仅，只不过，几乎不We barely had time to catch the train.我们仅有勉强赶上火车的时间。【用法】1.barely用在句首时引起句子倒装。 2.barely含有否定意义，因此用在反意疑问句中时，句尾的疑问短句要用肯定形式。3.barely.when结构表示“刚就”，barely所在的部分要倒装。 4.barely不与 ever，any和 at all连用。形容词在句中做定语、表语和主语。考生应注意：(1)以 “a” 开头的形容词如alone, alike, asleep, awake等不能做前置定语，可做表语或后置定语。(2)某些以副词词缀 “-ly” 结尾的词是形容词，如friendly, leisurely, lovely等。(3)下列动词既是实义动词又是系动词，注意用做系动词时，要求形容词做表语：remain, keep, become, get, grow, go, come, turn, stay, stand, run, prove, seem, appear, look。2.考比较级时，考生应把握(1)形容词和副词比较级的形式是否和比较连词对应出现，即是否符合原级比较及比较级的结构。如：Do you enjoy listening to records? I find records are often as good as, or better than an actual performance.On the whole, ambitious students are more likely to succeed in their studies than are those with little ambition.(2)比较的成分
展开阅读全文