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)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，考研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.
八、形容词、副词及其比较级
1.形容词的句法功能
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。如：
All those left undone may sound great in theory, but even the truest believer has great difficulty when it comes to specifics.
2.副词主要测试其修饰作用
考生应了解：副词可修饰谓语动词、非谓语动词、形容词、副词、介词短语、整个句子。如：
This pair of shoes isn't good, but that pair is hardly better.
(与前半句的否定意义吻合)
It's essential that people be psychologically able to resist the impact brought about by the transition from planned economy to market economy.
Andrew, my father's younger brother, will not be at the picnic, much to the family's disappointment.
Most of us are of the opinion that this set of training program is among the most wisely devised ones we have seen so far.
3.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)比较的成分是否属于同类事物或同类概念。如：
The number of registered participants in this year's marathon was half that of last year's.
Young readers, more often than not, find the novels of Dickens far more exciting than Thackeray's.
(3)比较级的修饰语如 a little, a lot, the, any, even, far, hardly, lots, much, rather，还有表示倍数比较的词等，他们的位置是：修饰语 as…as…, 或修饰语 more…than…。如：
Smoking is so harmful to personal health that it kills seven times more people each year than automobile accidents.
"Do you regret paying five hundred dollars for the painting?" "No, I would gladly have paid twice as much for it."
(4)下列词和短语不用比较级形式却表示比较概念：
inferior，minor，senior，prior，prefer to，superior，major，junior，preferable，differ from，compared with，in comparison with，different from，rather than。如：
Their watch is superior to all the other watches on the market.
4.最高级形式应注意的问题
(1)最高级比较范围用介词in, over, of, among。
in, (all)over用于在某一范围内的比较，如：in China, all over the world； of, among 用于在同一群体内同类事物的比较，如：among the teachers, of the four dresses。
注意：among…相当于one of…，不说among all…。这一点考生应与汉语表达区别开来。如：
Of all visible lights, red light has the longest and violet the shortest wavelength.
(2)比较级形式表示最高级意义时，比较对象的范围应用：
any other 单数名词
the other 复数名词
the others
anyone/anything else
上述词是用来将比较级结构转变成最高级意义的关键词语，切不可遗漏，否则会造成逻辑混乱的错误。如不能说：John runs faster than anyone.注意与汉语表达的不同。
5.有关比较级的特殊句型
(1)not so much…as…与其说……不如说……
The chief reason for the population growth isn't so much a rise in birth rates as a fall in death rates as a result of improvements in medical care.
(2)no/not any more…than…两者一样都不……The heart is no more intelligent than the stomach, for they are both controlled by the brain.
There is no reason they should limit how much vitamin you take, any more than they can limit how much water you drink.
(3)no /not any less…than…两者一样都……She is no less beautiful than her sister.
(4)just as…so….正如……，……也……(用倒装结构)Just as the soil is a part of the earth, so is the atmosphere.
九、平行结构
1.注意由并列连词或等立连词连接的成分在语法形式上是否相同，即都是形容词，或都是介词短语，或都是不定式，或都是动名词，或都是句子等。如：
Symposium talks will cover a wide range of subjects from overfishing to physical and environmental factors that affect the populations of different species.
In the teaching of mathematics, the way of instruction is generally traditional, with teachers presenting formal lectures and students taking notes.
2.注意比较结构中相比较的内容在语法形式上是否相同。如：
It is better to die on one's feet than to live on one's knees.
Despite the temporary difficulties, the manager prefers increasing the output to decreasing it.
3.其他具有并列或比较意义的短语。
(1)rather than, let alone 虽不是并列连词，但在结构上连接两个语法形式相同的成分。如：
We are taught that a business letter should be written in a formal style rather than in a personal style.
For the new country to survive, let alone for its people to enjoy prosperity, new economic policies will be required.
(2)如果平行的两个成分在形式上是介词短语，而且介词相同，一般说来第二个介词不要省略。如：
At times, more care goes into the composition of newspaper and magazine advertisements than into the writing of the features and editorials.
十、代词
1.与所指代的名词在性、数、格上是否一致
如：Each cigarette a person smokes does some harm, and eventually he may get a serious disease from its effect.
It was during the 1920's that the friendship between the two American writers Hemingway and Fitzgerald reached its highest point.
Our department was monitored by two supervisors, Bill and me.
2.that的指代作用
that指代不可数名词和单数可数名词(如是复数，用those)，后面通常跟有修饰语，如出现在比较结构中的that of。如：
Conversation calls for a willingness to alternate the role of speaker with that of listener, and it calls for occasional "digestive pauses" by both.
No bread eaten by man is so sweet as that earned by his own labor.
3.one的指代作用
one指代带不定冠词的单数可数名词，复数为ones。the one 指代带定冠词的单数可数名词。如：
A good writer is one who can express the commonplace in an uncommon way.
4.do的替代作用
do代替动词，注意数和时态的变化。如：
For him to be rejected, what is essential is not that his policy works, but that the public believe that it does.
十一、主谓一致问题
主谓一致是指主语与谓语在数上要一致。把握主谓一致问题，考生主要解决的是对不同结构的主语单复数的认定，进而选择适当的谓语。
1.主谓一致常出现在主谓倒装结构中。如：
Just outside the ruins is a magnificent building surrounded by tall trees.
Although a great number of houses in that area are still in need of repair, there has been improvement in the facilities.
2.主语与谓语之间有定语从句或其他结构修饰，所以距离较远，考生易误认主语。如：
The amount of pressure which the materials are subject to affects the quality of the products.
3.关系代词做主语的定语从句中，谓语的数要与先行词一致。如：
Despite much research, there are still certain elements in the life cycle of the insect that are not fully understood.
There are many valuable services which the public are willing to pay for, but which do not bring a return in money to the community.
4.动名词短语、不定式短语、名词性从句做主语，谓语用单数。如：
Buying clothes is often a time-consuming job because those clothes that a person likes are rarely the ones that fit him or her.
To understand the situation completely requires more thought than has been given thus far.
5.主语带有(together/along)with, such as, as well as, accompanied by, including, rather than 等附加成分, 谓语的数不受附加成分的影响。如：
The president of the college, together with the deans, is planning a conference for the purpose of laying down certain regulations.
6.表示时间、距离、金额、重量、面积、体积、容积等度量的名词短语做主语时，谓语用单数。
7.某些固定结构中谓语的数：
a great many 可数名词复数 谓语用复数
many a 可数名词单数 谓语用单数
a number of 可数名词复数 谓语用复数
the number of 可数名词复数 谓语用单数
the majority of 可数名词复数 谓语用复数
each/every 可数名词单数 谓语用单数
neither/either of 可数名词复数 谓语用单数
more than one 可数名词单数 谓语用单数
one and a half 可数名词复数 谓语用单数
the greater part of
a large proportion of
50% of
谓语的数与of后面的名词一致
one third of
plenty of
the rest of
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，考研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.
八、形容词、副词及其比较级
1.形容词的句法功能
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。如：
All those left undone may sound great in theory, but even the truest believer has great difficulty when it comes to specifics.
2.副词主要测试其修饰作用
考生应了解：副词可修饰谓语动词、非谓语动词、形容词、副词、介词短语、整个句子。如：
This pair of shoes isn't good, but that pair is hardly better.
(与前半句的否定意义吻合)
It's essential that people be psychologically able to resist the impact brought about by the transition from planned economy to market economy.
Andrew, my father's younger brother, will not be at the picnic, much to the family's disappointment.
Most of us are of the opinion that this set of training program is among the most wisely devised ones we have seen so far.
3.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)比较的成分是否属于同类事物或同类概念。如：
The number of registered participants in this year's marathon was half that of last year's.
Young readers, more often than not, find the novels of Dickens far more exciting than Thackeray's.
(3)比较级的修饰语如 a little, a lot, the, any, even, far, hardly, lots, much, rather，还有表示倍数比较的词等，他们的位置是：修饰语 as…as…, 或修饰语 more…than…。如：
Smoking is so harmful to personal health that it kills seven times more people each year than automobile accidents.
"Do you regret paying five hundred dollars for the painting?" "No, I would gladly have paid twice as much for it."
(4)下列词和短语不用比较级形式却表示比较概念：
inferior，minor，senior，prior，prefer to，superior，major，junior，preferable，differ from，compared with，in comparison with，different from，rather than。如：
Their watch is superior to all the other watches on the market.
4.最高级形式应注意的问题
(1)最高级比较范围用介词in, over, of, among。
in, (all)over用于在某一范围内的比较，如：in China, all over the world； of, among 用于在同一群体内同类事物的比较，如：among the teachers, of the four dresses。
注意：among…相当于one of…，不说among all…。这一点考生应与汉语表达区别开来。如：
Of all visible lights, red light has the longest and violet the shortest wavelength.
(2)比较级形式表示最高级意义时，比较对象的范围应用：
any other 单数名词
the other 复数名词
the others
anyone/anything else
上述词是用来将比较级结构转变成最高级意义的关键词语，切不可遗漏，否则会造成逻辑混乱的错误。如不能说：John runs faster than anyone.注意与汉语表达的不同。
5.有关比较级的特殊句型
(1)not so much…as…与其说……不如说……
The chief reason for the population growth isn't so much a rise in birth rates as a fall in death rates as a result of improvements in medical care.
(2)no/not any more…than…两者一样都不……The heart is no more intelligent than the stomach, for they are both controlled by the brain.
There is no reason they should limit how much vitamin you take, any more than they can limit how much water you drink.
(3)no /not any less…than…两者一样都……She is no less beautiful than her sister.
(4)just as…so….正如……，……也……(用倒装结构)Just as the soil is a part of the earth, so is the atmosphere.
九、平行结构
1.注意由并列连词或等立连词连接的成分在语法形式上是否相同，即都是形容词，或都是介词短语，或都是不定式，或都是动名词，或都是句子等。如：
Symposium talks will cover a wide range of subjects from overfishing to physical and environmental factors that affect the populations of different species.
In the teaching of mathematics, the way of instruction is generally traditional, with teachers presenting formal lectures and students taking notes.
2.注意比较结构中相比较的内容在语法形式上是否相同。如：
It is better to die on one's feet than to live on one's knees.
Despite the temporary difficulties, the manager prefers increasing the output to decreasing it.
3.其他具有并列或比较意义的短语。
(1)rather than, let alone 虽不是并列连词，但在结构上连接两个语法形式相同的成分。如：
We are taught that a business letter should be written in a formal style rather than in a personal style.
For the new country to survive, let alone for its people to enjoy prosperity, new economic policies will be required.
(2)如果平行的两个成分在形式上是介词短语，而且介词相同，一般说来第二个介词不要省略。如：
At times, more care goes into the composition of newspaper and magazine advertisements than into the writing of the features and editorials.
十、代词
1.与所指代的名词在性、数、格上是否一致
如：Each cigarette a person smokes does some harm, and eventually he may get a serious disease from its effect.
It was during the 1920's that the friendship between the two American writers Hemingway and Fitzgerald reached its highest point.
Our department was monitored by two supervisors, Bill and me.
2.that的指代作用
that指代不可数名词和单数可数名词(如是复数，用those)，后面通常跟有修饰语，如出现在比较结构中的that of。如：
Conversation calls for a willingness to alternate the role of speaker with that of listener, and it calls for occasional "digestive pauses" by both.
No bread eaten by man is so sweet as that earned by his own labor.
3.one的指代作用
one指代带不定冠词的单数可数名词，复数为ones。the one 指代带定冠词的单数可数名词。如：
A good writer is one who can express the commonplace in an uncommon way.
4.do的替代作用
do代替动词，注意数和时态的变化。如：
For him to be rejected, what is essential is not that his policy works, but that the public believe that it does.
十一、主谓一致问题
主谓一致是指主语与谓语在数上要一致。把握主谓一致问题，考生主要解决的是对不同结构的主语单复数的认定，进而选择适当的谓语。
1.主谓一致常出现在主谓倒装结构中。如：
Just outside the ruins is a magnificent building surrounded by tall trees.
Although a great number of houses in that area are still in need of repair, there has been improvement in the facilities.
2.主语与谓语之间有定语从句或其他结构修饰，所以距离较远，考生易误认主语。如：
The amount of pressure which the materials are subject to affects the quality of the products.
3.关系代词做主语的定语从句中，谓语的数要与先行词一致。如：
Despite much research, there are still certain elements in the life cycle of the insect that are not fully understood.
There are many valuable services which the public are willing to pay for, but which do not bring a return in money to the community.
4.动名词短语、不定式短语、名词性从句做主语，谓语用单数。如：
Buying clothes is often a time-consuming job because those clothes that a person likes are rarely the ones that fit him or her.
To understand the situation completely requires more thought than has been given thus far.
5.主语带有(together/along)with, such as, as well as, accompanied by, including, rather than 等附加成分, 谓语的数不受附加成分的影响。如：
The president of the college, together with the deans, is planning a conference for the purpose of laying down certain regulations.
6.表示时间、距离、金额、重量、面积、体积、容积等度量的名词短语做主语时，谓语用单数。
7.某些固定结构中谓语的数：
a great many 可数名词复数 谓语用复数
many a 可数名词单数 谓语用单数
a number of 可数名词复数 谓语用复数
the number of 可数名词复数 谓语用单数
the majority of 可数名词复数 谓语用复数
each/every 可数名词单数 谓语用单数
neither/either of 可数名词复数 谓语用单数
more than one 可数名词单数 谓语用单数
one and a half 可数名词复数 谓语用单数
the greater part of
a large proportion of
50% of
谓语的数与of后面的名词一致
one third of
plenty of
the rest of
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