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英语四级(CET4)语法复习之二

  谓语动词用复数的情况

  1) both, some, few, many 等用作主语或修饰主语时,谓语动词用复数。

  【例如】

  Both of my parents are over seventy years old.

  Many students in my class have creative thoughts and wide knowledge.

  2) “ the + 形容词”作主语,在表示一类人或事物时,谓语动词用复数。

  【例如】

  The aged are well taken care of by the government.

  The poor are often looked down upon by the rich.

  The young have respect for the old in China .

  3) a number of, a lot of, any of, most of, the rest of, some of, none of, all of 修饰复数名词时,谓语动词用复数。

  【例如】

  Most of the teachers are responsible and knowledgeable.

  A number of books have been published on the subject.

  None of the books attract me a lot. the number of 表示“……的数量”,谓语动词用单数。

  【例如】

  The number of books published on this subject is simply amazing.

  The number of foreign visitors to China has been increasing over the last several years.

  4) 集合名词作主语时,当名词表示整体时,谓语动词用单数;当名词强调集体中的个体时,谓语动词用复数。

  【例如】

  The family is the basic unit of society. The family have agreed among themselves to spend their vocation in Europe .

  CET4 语法: used to 的用法

  “ used to 加不定式”表示过去常常干某事,现在不在干了。例如 :

  I used to go to work by bus. Now I take a taxi.

  She used to be very shy.

  “ be used to doing ”表示习惯于干某事。

  【例如】

  I am used to getting up early and going to bed early.

  He is used to being praised by others.

  关系从句中的谓语动词

  在“ one of + 名词 ( 复数 )+ 关系从句”中的单复数在“ one of+ 名词 ( 复数 )+ 关系从句”中,关系从句中的谓语动词常采用复数形式。

  【例如】 She is one of the students who have passed Band Six.

  This is one of the best books that have been published recently.

  one 之前有 the only 等修饰语时从句动词要用单数。

  【例如】 She is the only one of the girls who is chosen as the member of student union.

  He was the only one of the boys who was given a prize.

  以 only 引导状语位于句首引起的倒装

  Only by shouting at the top of his voice was he able to make himself heard. Only in this way can we achieve what we want.Only in each afternoon does the university library open. Only under special circumstances ____to take make  up tests. (CET-4 1997,6)

  A) are freshmen permitted

  B) permitted are freshmen

  C) freshmen are permitted

  D) are permitted freshmen

  Only 加状语位于句首,句子用倒装语序,故答案为 A 。

英语四级(CET4)语法复习之一

  CET4语法复习之一

  动宾一致

  英语语法规定,用于宾语的词语应使用它们的宾格。能够用做宾语的词类中只有人称代词有特别的宾格形式,其他词类如名词原形即可用于宾格,无须变化。词与词之间的固定搭配属于英语的惯用法。一些动词与它们用于宾语的名词之间也存在固定搭配现象。

  【例如】

  to acquire knowledge

  获得知识

  to get a job

  获得工作

  to obtain a position

  获得工作 ( 语气较庄重 )

  to achieve success

  获得成功

  to gain reputation

  获得声誉

  to attain one’s end

  达到目的

  to do sb. a favor

  请帮忙

  这类惯用法没有太多的章法可循 , 只有在平时的阅读中多看,多记。

  时态一致

  时态一致

  1) 并列谓语的时态一致。

  【例如】 Yesterday I went shopping, bought some books and had dinner at a good restaurant.

  The soldier looked at him, exchanged glances with his comrade and took out the gun.

  2) 主从复合句的时态一致。

  a) 主句为现在时、将来时、现在完成时,宾语从句谓语动词时态按情况而定。

  【例如】

  I wonder what will happen tomorrow.

  I wonder what happened to him yesterday.

  I wonder what is happening now outside.

  b) 主句为过去时态,宾语从句一般用过去时态。如果宾语从句说明的是客观真理,用一般现在时。

  【例如】

  He told me he made a big mistake.

  He told me he would go to Beijing the next day.

  He told he had finished his task.

  The teacher told students that the earth moves around the sun.( 客观真理 )

  3) 定语从句和比较状语从句时态不受主句影响。

  【例如】

  The universityswhereshe is studying was founded in 1950.

  You now speak English better than you spoke it last year.

  4) 时间和条件状语从句中,常用现在时表示将来。

  【例如】

  We will cancel our trip if it rains tomorrow.

  I will go to visit the Summer Palace as soon as I arrive in Beijing .

  集合名词的主谓一致

  集合名词作主语时,主谓一致关系是一个较为复杂的问题。对此类问题我们可以从“数”的角度分为四类。

  1) 单数—复数型。凡是有复数词尾变化形式的集合名词都属于此类。如: a class — classes; a family — families; a government—governments; an army—armies; a people—peoples; a group—groups; a crowd—crowds; a crew — crews 等。这类集合名词强调的是整体性,即当作一个整体或多个整体来看待。属于这类集合名词的单数作主语时,谓语动词用单数;复数形式作主语时,谓语动词用复数。

  【例如】

  A big crowd often gathers on the square every morning.

  The government has decided to pass the bill.

  There are huge crowds in the streets on Sunday.

  There are many English-speaking peoples in the world.

  但应注意,这类集合名词的单数形式有时表示复数概念,所以这些集合名词的单数形式也可归为“单复同形型”中。

  2) 单数型。这类集合名词表示的是人或事物的整体,即把这类人或事物的全部包括在内,所以只有单数形式。如作主语,谓语动词常用单数。这类名词常见的有: humanity, mankind, proletariat 等。

  【例如】 The proletariat is the greatest class in the history of mankind. In the fields of production and scientific experiment, mankind makes constant progress.

  3) 复数型。这类集合名词在形式和内容上是相互矛盾的,就是说它们只有单数形式,但表达的都是复数概念。它强调的是集体中的个体性。这类名词有: police, cattle, faculty, flock, machinery, vermin, personnel 等。它们作主语时,谓语动词要用复数。

  【例如】 The police have caught the murder.

  Our personnel are very highly trained.

  The vermin are very dangerous.

  4) 单复同形型。这类集合名词的单数形式既可表示单数也可表示复数。作主语时,用单数动词或复数动词均可,有时意义区别不大。

  【例如】 The school teaching staff are (is) excellent.

  The public is (are) requested not to litter in the park.

  The teaching profession claim(s) to be badly paid.

  这类集合名词常见的有: class, family, team, crew, board, herd, committee, party, jury, enemy, audience 等。

  根据说话人的心理意向若把这个集合名词所代表的人或事物看作一个整体,就认为是单数,用单数动词;若把它所代表的人或事物看作若干个个体的话,就认为其为复数,用复数动词。

  试比较: The football team is playing well.

  那个足球队打得非常漂亮。

  The football team areshavingsbath and are then coming back here for tea.

  足球队员们正在洗澡,然后来这里吃茶点。

  The family is a very happy one.

  那个家庭是一个非常幸福的家庭。

  That family are very pleased about the news of William’s success.

  全家人对威廉的成功都感到很高兴。

  “一致”部分练习题 ( 附答案 )

  1)Bread and butter ____ what Americans usually have for breakfast.

  A) are B) is C) was D) were

  2)Each boy and girl ____given a gift on Christmas Day.

  A) is B) are C) were D) was

  3) Nobody but Jack and Jane ____ made great progress in the class recently.

  A) have B) has C) had D) has been

  4) Jim is the only one of the staff members who ____to be promoted.

  A) are B) have been C) is D) has been

  5) Many a child ____to walk before he can speak

  A) learn B) learns C) learned D) have learned

  6) Not only he but also I ____to work hard and pass the exam.

  A) want B) wants C) wanted D) wanting

  6) Every means ____tried but with no end.

  A) have been B) have had C) has been D) are

  7) My house and home ____ at 108 Maryland .

  A) are B) is C) were D) is being

  8) A horse and carriage ____ not much used nowadays

  .A) is B) are C) were D) is to be

  10) Many a writer of newspaper articles ____ to writing novels.

  A) has turned B) have turned C) being turned D) are going to turn

  11) Either the teachers or the president ____ the meeting

  .A) attends B) attend C) are attending D) have attended

  12) Neither of your suggestions ____ sense.

  A) makes B) make C) is made D) are made

  13) None of your projects ____.

  A) working out B) work out C) is worked out D) are worked out

  14) Going to bed early and getting up early ____ a good habit.

  A) is B) are C) were D) was

  15) Statistics ____ his most difficult subject and they are all worried that he won’t pass the test.

  A) is B) are C) was D) were

  16) Statistics ____ that most of the published and quoted scientific articles are related to medical science.

  A) has shown B) is shown C) show D) shows

  17) Everyone who read Women in Love said it ____ one of the best books by Lawrence

  .A) is B) was C) had been D) has been

  18) The teacher told us that to remember details, it ____ important to take notes while listening to the lecture.

  A) would be B) had been C) was D) is

  19) A series of debates between the major candidates ____ scheduled for the Labor Day weekend last week.

  A) is B) are C) was D) were

  20) Two hundred and fifty pounds ____ too unreasonable a price for a second-hand car.

  A) is B) are C) were D) be

  21) Twenty minutes ____ a long time for one who waits.

  A) seem B) seems C) seemed D) are seemed

  22) David is one of the boys who ____ a driving license.

  A) has B) have C) isshavingsD) are having

  23) The audience ____ their seats in the music hall.

  A) are taking B) is taking C) are taken D) was taking

  24) The salesman told me that a good set of tires ____ guaranteed to run at least fifty thousand miles.

  A) was B) were C) had been D) will be

  25) Up to now, the majority of the undergraduates ____ enrolled for this selected course.

  A) has been B) have C) had been D) would have been

  26) The police ____ asked that anyone who saw the accident should get in touch with ____.

  A) have…them B) has…him C) have…him D) has…them

  27) I don’t think one hundred dollars ____ a big sum of money to him.

  A) will be B) would be C) is D) are

  28) None of the shops in the downtown ____ before 8 pm .

  A) is going to be closed B) will be closing C) is closing D) are being closed

  29) Five multiplied by two ____ten.

  A) is equal B) equals C) equal with D) equal to

  30) My friend and classmate Paul ____ motorcycles in his spare time.

  A) race B) races C) is raced D) is racing

  “一致”部分练习题答案

  1)B 2)A 3)B 4)C 5)B

  6)A 7)C 8)B 9)A 10)A

  11)A 12)A 13)B 14)A 15)A

  16)C 17)B 18)D 19)C 20)A

  21)B 22)B 23)A 24)A 25)A

  26)A 27)C 28)A 29)B 30)B 

  CET4 语法:主谓一致的三条原则

  在大学英语四级测试的“词汇与结构”一题中,考查主语和谓语一致关系的试题居多。所以主谓一致是各类一致关系中应该重点掌握的内容。现代英语主谓一致大致要遵循以下三条原则: 1) 语法一致原则。主语是单数,谓语动词用单数形式;主语是复数,谓语动词用复数形式。

  【例如】

  My friend has no intention of going shopping with me.

  My friends have no intention of going shopping with me.

  2) 意义一致原则。主语和谓语的一致不是由主语的语法形式来决定,而是由主语所表达的意义决定。

  【例如】

  The class are busying writing English passages.

  The United States is a developed country which has advanced science and technology.

  带有复数词尾的学科名称、国家等在意义是表示单数概念,用单数动词。

  3) 就近原则。谓语动词的单、复数取决于最靠近它的主语。由 either….or, neither….nor, not only….but also 连接或由 here, there 等引导的句子,谓语动词遵循这一原则。

  【例如】 Neither my friends nor I was able to persuade him to accept our advice.

  Either he or she has broken the window, for there is no one else there.

  There is a teacher and fifty students in the classroom.

大学英语四六级考试语法精要汇总

大学英语四六级考试语法精要汇总

大学英语四六级考试语法精要(六)

  从句

  I定语从句

  1.先行词为all, anything, something, nothing, everything, much, little, none等不定代词时,关系代词一般只用that,不用which。在大多数情况下that可以省略.

  Please tell me everything (that) you know about the matter.

  That’s all (that) we can do at the moment.

  2.as引出的限制性定语从句

  在such … as的结构中as可作关系代词,引出限制性定语从句。有时和same连用,在从句中可作主语、宾语或表语等。

  Such people as were recommended by him were reliable.

  I’ve never seen such a talented young man as he is.

  I have the same trouble as you (have).

  3.as引出的非限制性定语从句

  as可作关系代词引出非限制性定语从句,代替整个主句,通常译为“(正)如…一样”,“(正)象…一样”等。as引导的从句一般用逗号与主句隔开,可以位于主句的前面、中间或后面.

  I live a long way from work, as you know.

  She did not, as her friend had feared, break down.

  As is generally accepted, economic growth is determined by the smooth development of production.

  4.分隔式定语从句

  定语从句一般紧跟在先行词之后,但有时会被其他句子成分与先行词隔开,从而构成分隔式定语从句。

  The days are gone when power politics worked.

  A new teacher will come tomorrow who will teach you French.

  5.介词+关系代词(which/whom等)引出的定语从句

  如果关系代词(which/whom等)在定语从句中作介词的宾语,那么这个介词可以提到从句前,构成“介词+关系代词(which/whom等)+定语从句”。在这种结构中关系代词不可以用that。

  This is a subject about which we might argue for a long while.

  The four travelers with whom I shared the room were pleasant people.

  6.关系代词在限制性定语从句中常可以省略,一般有以下几种情况:

  1) 关系代词在从句中作直接宾语时,在大多数情况下可以省略。

  This is something (that) you must always keep in mind.

  The man (whom) you just met is our manager.

  关系代词作介词宾语时,介词位于句尾时关系代词可以省略;介词位于关系代词之前时则关系代词不能省略。

  This is the room (which) Churchill was born in.

  This is the room in which Churchill was born.(which不可省略)

  2) 关系代词作主语时一般不能省略,但如果关系代词在由there … be存在句构成的定语从句中作主语时常可省略。

  This is the only book (that) there is on this subject.

  The old professor made full use of the time (that) there was left to him to continue his research.

  3) 在way后面的定语从句中in which或that通常省略。

  That’s the way (that/in which) I look at it.

  I don’t like the way (that/in which) you laugh at her.

  7.非限制性定语从句的美女编辑们

  非限制性定语从句修饰先行词或整个主句,起补充说明的作用,如果省略掉,原句句意仍保持完整。非限制性定语从句要用逗号与主句隔开,其引导词不能用that。非限制性定语从句属于正式语体。经常考到的非限制性定语从句有以下三种。

  1)由which、as引导的非限制性定语从句。which、as代表整个主句。

  He said that he had never seen her before, which was not true.

  China is still a developing country, which is known to all of us.

  2)由 “介词+关系代词”引导的非限制性定语从句。

  He sent her a letter, in which he said that he was sorry for what he had done to her.

  He failed to pass the exam, because of which his parents scolded him.

  4) 由 “数词、代词或名词+of +关系代词”引导的非限制性定语从句。

  He had three sons, one of whom was my son’s classmate.

  There are about twenty students in this course, most of whom are freshmen.

  They are two different words, the spellings of which are easily confused.

  Ⅱ 状语从句

  1.状语从句中以下四种从句考得较多,这里给予简单介绍。

  1) 时间状语从句

  时间状语从句主要由以下连词引导:when, whenever, as, while, since, until, till, before, after, as soon as, once, hardly (scarcely) … when, no sooner … than。

  I will discuss the matter with you when we meet tomorrow.

  He didn’t go to sleep until he finished doing his homework.

  You have changed a lot since we met last time.

  时间状语从句还可由某些可充当连词的名词(the moment, the instant, every time,等)和副词(instantly, directly等)引导:

  I will tell you the news the instant I know.

  Directly the teacher came in everyone was quiet.

  Note:

  ①before除了可表示 “在…之前”外,还可用来强调主句所表达的时间、距离很长或花费的力量相比较大,可译为“…才”。(“not … before” 可用来强调主句所表达的时间、距离很短或花费的力量相比较小,可译为“…就”)。

  It was a long time before I got to sleep again.

  They had not been married a month before they quarreled.

  ②如果位于when引导的分句之前的主句使用过去进行时、过去完成时或“was/were about to, was/were on the point of”等结构时,when表示突然发生某事,可译为“正在…突然”或“刚…就”等。这时,不能够用as或while来代替when。

  I was walking on the street when I ran into my old friend John.

  She had just fallen asleep when the telephone rang.

  We were about to leave when it began to rain.

  2) 条件状语从句

  条件状语从句主要由以下连词引导:if, unless, providing/provided (that), suppose/supposing (that), on condition (that), as/so long as, in case等。

  So long as you work hard, you will surely achieve good results in examinations.

  I shall return next Thursday unless something unexpected happens.

  I will go provided that you go with me.

  Please give this letter to John in case he comes.

  3) 让步状语从句

  让步状语从句主要由以下连词引导:though, although, even if, even though, whatever, however, whoever, wherever, no matter how/ what/ where/ when等。以下介绍几种较特殊的让步状语从句。

  (1)while引导的让步状语从句多放在句首,while相当于although,表示“尽管”,“虽然”。

  While I admit I did it, I didn’t intend to.

  While I understand what you say, I can’t agree with you.

  (2)短语“even now/then/so”相当于“though it is/was true”,表示“尽管如此”,“尽管这样”。

  The fire was out, but even so, the smell of smoke was strong.

  I’ve tried my best, but even now/then she is not satisfied.

  (3) as引导的让步状语从句要倒装。

  Child as he was, he could speak four languages.

  Hard as she tried, she failed to get the job.

  4) 比较状语从句

  比较状语从句主要由以下连词引导:(not) as … as, (not) the same as, (not) such … as, not so … as, than, the + 比较级…, the +比较级…等。

  We have had a lot more rainfall this year than we had last year.

  She can speak English as fluently as her teacher (can).

  Ⅲ 宾语从句

  1) 及物动词后的宾语从句

  有些动词的宾语从句前还可有一个间接宾语。

  I remember that we have learned this word before.

  I don’t understand what you have said.

  She asked the teacher how she could learn English well.

  2) 介词的宾语从句

  It depends on whether you want to do it or not

  There is disagreement among economists about what money is and how money is measured.

  Note: 在介词in后面跟that引导的宾语从句中,in that可看成是一个固定的搭配,表示“因为”或“在…方面”。

  The evidence is invalid in that it was obtained through illegal means.

  A turtle differs from all other reptiles in that it has its body encased in a protective shell of its own.

大学英语四六级考试语法精要(五)

  虚拟语气

  1. 表示现在/过去/将来情况的虚拟条件句

  虚拟条件句主要有三种结构:

  1) 表示与现在情况相反:主句谓语用“would / could / might +动词原形”,从句谓语用“动词的一般过去时”(动词be的过去式一律用were)。

  If I were you, I would not accept his offer.

  If I had time, I would certainly go to the cinema with you.

  2) 表示与过去情况相反:主句谓语用“would / could / might + have +过去分词”,从句谓语用过去完成时。

  If I had got up a little earlier, I wouldn’t have missed the train.

  If I had been more careful, I might have passed that exam.

  3) 表示与将来情况相反:主句谓语用“would / could / might +动词原形”,从句谓语用“were +动词不定式”或“should +动词原形”。

  If I were to do the job, I would not be able to have enough time to study.

  If it should rain tomorrow, I would not go out with you.

  2. 虚拟条件句连接词if的省略

  如果虚拟条件句的从句中含有were, had, should, could等词时,可以省略连接词if,但这时必须把were, had, should, could等词移到主语前面,形成倒装。这种句型主要用于书面形式。

  Were I to do the job, I would finish doing it within two weeks.

  Had it not been for his help, we couldn’t have arrived there on time.

  Should it rain tomorrow, I would stay at home.

  3. wish后宾语从句中的谓语构成

  动词wish后的宾语从句表示未实现的或不可能实现的愿望,其宾语从句中的谓语动词要用虚拟语气,有以下三种构成形式。

  1) 表示现在不可能实现的愿望,宾语从句中的谓语动词用一般过去时。(be的过去式为were)。

  I wish I had enough money to buy a car.

  I wish I were as young and energetic as you.

  2) 表示过去未能实现的愿望,宾语从句中的谓语动词用过去完成时(had +过去分词)或“would / could + have +过去分词 ”。

  I wish I hadn’t made such a mistake.

  I wish I could have done it better.

  3) 表示将来不可能实现的愿望,宾语从句中的谓语动词用“would / should (could, might) +动词原形”。

  I wish I would not get old.

  I wish I could travel around the world one day.

  4. 某些动词后的宾语从句中谓语动词要用虚拟语气

  在一些动词后面的宾语从句中,谓语动词要用虚拟语气。这时,谓语动词用动词原形或should +动词原形。这类动词一般表示命令,要求,决定,建议,主张等概念,主要有:advise, ask, command, decide, demand, desire, direct, insist, move, order, propose, recommend, request, require, suggest,等。

  The workers demanded that their wages (should) be raised by 10 per cent.

  The teacher decided that you do the experiment first.

  5. 某些名词后的表语从句和同位语从句中谓语动词要用虚拟语气

  在一些名词后面的表语从句和同位语从句中,谓语动词要用虚拟语气。这时,谓语动词用动词原形或should +动词原形。这类名词一般表示命令,要求,决定,建议,主张等概念,主要有:advice, idea, instruction, motion, order, plan, proposal, recommendation, request, requirement, suggestion,等。

  My suggestion is that we (should) send for a doctor immediately.

  He gave the order that they (should) do the experiment again.

  6. 错综时间条件句

  条件从句表示的动作和主句表示的动作,有时发生的时间是不一致的.如从句是对过去情况的假设,而主句可能是对现在正在进行情况的假设。 这种句子称为错综时间条件句.

  If the weather had been more favourable, the crops would be growing still better.

  7. 某些主语从句中的谓语动词要用虚拟语气

  某些表示命令,要求,决定,建议,主张以及“重要性”和“紧迫性”等概念的主语从句中谓语动词要用虚拟语气。这时,谓语动词用动词原形或should +动词原形。这类主语从句一般由 “It is (was) + 形容词/过去分词 + that引导的从句”构成。该结构中,常用的形容词主要有:advisable, appropriate, desirable, essential, imperative, important, necessary, obligatory, proper, urgent, vital等;常用的过去分词主要有:arranged, decided, demanded, desired, ordered, proposed, recommended, requested, suggested等。

  It is necessary that you (should) stop smoking so heavily.

  It is arranged that you (should) enter for this competition.

  8. as if / though引起的从句

  当as if / though引起的从句所表达的内容完全与实际情况相反或者纯粹是一种假设时,通常要用虚拟语气。如果从句表示与现在的事实相反,谓语动词用一般过去时;如果从句表示与过去的事实相反,谓语动词用过去完成时;如果从句表示与将来的事实相反,谓语动词用would (might, could) + 动词原形;

  They talked as if they had been friends for years.

  I remember the whole thing as if it happened yesterday.

  It looks as if it might rain.

  Note: 如果as if / though引起的从句所表达的内容被看作是事实或者有可能是真实的,则要用陈述语气。

  It seems as if it is going to rain.

  The meat tastes as if it has already gone bad.

  9. lest, for fear that和 in case引起的从句

  当lest, for fear that和 in case表示“以免,以防,生怕,惟恐”等时,在它们引起的从句中,谓语动词常用should + 动词原形。

  He ran away lest he should be seen.

  He’s working hard for fear that he should fall behind.

  He left early in case he should miss the last train.

  10. If only引出的从句

  If only引出的从句用以表达感叹性的愿望,常译为“要是…就好了”。If only从句经常省略结果主句,且主要用在虚拟语气中,即从句的谓语动词用一般过去时表示现在或将来不可能实现的愿望,或用过去完成时表示过去没有实现的愿望。

  If only the rain would stop.

  If only I’d listened to my parents.

  Note: if only引出的句子偶尔也可使用陈述语气,但考生须注意的是,在各类测试中一般都以用虚拟语气为正确答案。

  11. would rather(that)引出的从句

  would rather意为“宁愿”,接从句时常省略关系代词that。would rather后的从句要用虚拟语气,即从句谓语动词用一般过去时表示现在或将来的愿望,用过去完成时表示与过去事实相反的愿望。

  I’d rather you told me the truth.

  I would rather you came tomorrow than today.

  I’d rather you hadn’t told me about it.

  12. It is (about/high) time (that) 句型

  该句型表示“(早)该做…”,其后的定语从句中的谓语动词要用虚拟语气表示。在测试中从句的谓语动词用一般过去时。

  It is time that we went to bed.

  It is high time that somebody taught you to behave yourself.

  13. 表示猜测的几种不同的方法及意义

  一些情态动词与动词的完成式连用能够表示对过去情况的猜测或者未实现的可能性。

  1) could have + 过去分词

  A. 表示对过去可能发生的事情的推测,意为,“可能做了某事”。

  He couldn’t have seen her yesterday.

  They could have lost their way.

  B. 表示某事在过去本有可能发生,但事实上并未发生,意为,“本可以做某事”。

  We could have started a little earlier.

  I could have killed her. It was a narrow escape.

  2) may (might) have + 过去分词

  A. 表示对过去情况的推测,意为,“可能已做某事”。

  He may have heard the news.

  I might have come to a wrong conclusion.

  B. 表示一种未实现的可能性,即本可以做某事,而实际上并没有做,有时含有抱怨的口吻。

  It was a narrow escape. You might have killed yourself.

  A lot of men died who might have been saved.

  3) must have + 过去分词

  表示逻辑上的必然性,即按照某些现象推断过去肯定发生过的某事。

  She must have made a big mistake.

  The city at one time must have been prosperous, for it enjoyed a high level of civilization.

  4) needn’t have + 过去分词

  表示过去不必做某事,但已经做了,即本可不必做某事。

  You needn’t have woken me up. I don’t have to go to work today.

  He needn’t have watered the flowers, for it is going to rain.

  5) should / ought to have + 过去分词

  表示过去应该做某事而实际上没有做。

  You should / ought to have done what your parents told you. (But you failed to do it.)

  You should / ought to have been more careful. (But you weren’t.)

  6) shouldn’t / oughtn’t to have + 过去分词

  表示过去不应该做某事而实际上却做了。

  You shouldn’t / oughtn’t to have crossed the road when the lights were red. (But you did.)

  They shouldn’t / oughtn’t to have left so soon. (But they did.)

  7) would have + 过去分词

  表示对现在或将来某时之前业已完成的动作的推测。可译为,“可能”、“也许”、“想必”。

  He would have arrived by now.

  She would have recovered by then.

大学英语四六级考试语法精要(四)

  时态

  1. 现在完成时、过去完成时以及将来完成时之间的区别

  1) 现在完成时:的美女编辑们

  ① 构成:have / has +过去分词

  ② 语法意义及要点:

  A. 现在完成时表示一个过去开始的状态或动作持续到现在并可能继续持续下去,常同表示一段时间的状语连用。如so far, up to now, since, for a long time等。

  –He has worked as a teacher for many years.

  –Up till now, nothing has gone wrong.

  B. 现在完成时表示一个过去发生的对现在仍有影响的动作或事件。常与不确定的过去时间状语连用,如yet, just, before, recently等;也同表示频度时间状语连用,如often, ever, never, sometimes, several times等;还可同包括现在时间在内的时间状语连用,如now, today, this morning等。但不能同特定的过去时间状语连用(last year , in 1997等)。

  –I have never learned Japanese before.

  –We have been quite busy lately (recently).

  C. 在时间或条件状语从句中,当表示将来完成时的意义时,要用现在完成时来代替将来完成时。

  –We’ll start at 5 o’clock if it has stopped raining by then.

  –I shall go to see you when I have finished my homework.

  Note: 行为不能持续的瞬间动词(Instantaneous Verb), 如arrive, begin, come, go, start, leave, die, join等通常不能用于这一语法意义,即该类动词在现在完成时中不能与表示一段时间的状语连用。

  –He has joined the army for five years. (误)

  –He has been in the army for five years. (正)

  2) 过去完成时:

  ① 构成:had +过去分词

  ② 语法意义及要点:

  过去完成时表示某一动作或情况发生在过去某一时刻之前并持续到该时刻。

  –David and Jenny had known each other for a long time before their marriage.

  –They had got everything ready before the party began.

  Note: 与现在完成时截然不同的是过去完成时可以与表示具体过去的时间状语连用。

  –He said that he had seen her the day before yesterday.

  3) 将来完成时:

  ① 构成:shall / will + have +过去分词

  ② 语法意义及要点:

  将来完成时表示某一动作在将来某一时刻或将来某一动作之前已经完成或发生。

  –He will have graduated from high school before his next birthday.

  –The shop will have closed already before you get there.

  2. 哪些动词不能用于进行时

  1) 表示状态的动词,如be, seem, appear, become, get等。

  He is being a used-car dealer.(误)

  He is a used-car dealer.(正)

  She is seeming always about to smile.(误)

  She seems always about to smile.(正)

  2) 表示感官感觉的动词,如see(看见), hear(听见),feel(感觉出), taste(尝出),smell(闻到)等。

  The medicine is tasting bitter. (误)

  The medicine tastes bitter. (正)

  I was seeing a car passing by our house. (误)

  I saw a car passing by our house. (正)

  3) 表示拥有的动词,如have, own, possess, belong, contain, hold等。

  He is owning a luxurious car. (误)

  He owns a luxurious car. (正)

  The book is belonging to her. (误)

  The book belongs to her.(正)

  4) 表示思想状况、态度的动词,如believe, think, know, understand, agree, approve, consider, expect, forget, guess, hesitate, hope, imagine, mean, realize, remember, suppose, trust, want, wish等。

  I’m thinking that he is right. (误)

  I think that he is right. (正)

  I’m understanding your feelings. (误)

  I understand your feelings. (正)

  5) 表示情感、愿望的动词,如admire, appreciate, care, enjoy, like, love, hate, detest, regret等。

  He is loving his daughter very much. (误)

  He loves his daughter very much. (正)

  I’m regretting to say we cannot come. (误)

  I regret to say we cannot come. (正)

  3. 时态的呼应

  时态的呼应又称时态一致(Sequence of Tenses),指的是某些从句里的动词谓语时态必须和主句里的时态保持一致。

  如果主句里的谓语动词是过去时态(过去时或过去完成时),那么从句的谓语动词时态也相应地要用过去时。时态的呼应主要发生在间接引语和宾语从句中,但其他从句有时也存在时态一致的问题。

  –He explained that he had learned Chinese for many years.(现在完成时变为过去完成时)

  –He said he had been collecting materials on that subject for a long time.(过去进行时变为过去完成进行时)

  –He told me that they would have completed that project by the end of the year.(将来完成时变为过去将来完成时)

  虽然主句用了过去时等,如果从句表示的是科学真理、客观事实或某人(物)的经常性特点时,其时态可以不必遵守时态呼应的规则而仍用一般现在时。

  –Galileo proved that the earth revolves round the sun.

  –The teacher told the students that knowledge is power.

  如果从句中有一个表示绝对过去时间的状语,就不必把一般过去时变为过去完成时。

  –He said that he joined the Red Army in 1933.