1.可以代替长动词或动词词组:I have never seen an aardvark, but my father has.
但是仅限于时态一致的情况下,如果时态不一致还是要重复动词:I have never seen an aardvark, but last year my father did saw one.
2.特殊情况:当助动词想代替原文的一个动词(非主动词)的时候,形式必须一致
错Our cars were designed to inspire envy, and they are.
对Our cars were designed to inspire envy, and they do.
3.只能代表肯定,即便句子其他部分是否定的:Some people do not eat soup as others Do. (= do eat soup)
4.情态助动词:Can, could, may ,might, must, shall , should, will 和 would,第二章明确过:这些词在使用过程中不能随意相互替换。
a)语意相近的情态助动词重复使用,如have to 与must
b)句中其他部分已经表达了目标或者建议的意见,不必再使用情态助动词:
Wrong: This plan ensures that action must be taken.
Right: This plan ensures that action will be taken.
n比起用be to来表示目标或将来,GMAT更倾向于用will 或 should来表带。
Awkward: SHOULD he PASS the test, he will graduate.
Right: IF he PASSES the test, he will graduate.
n在表目的时=in order to ,都对;在表目的时要注意逻辑关系:
对:The contractors demolished the building to keep it from falling down.(was demolished的主语是contractors,同时也是不定式to keep的主语)
错:The building was demolished to avoid falling down accidentally. (was demolished的主语是building,也是avoid的主语,不合逻辑)
对:The building was demolished to keep it from falling down accidentally. (it指代building, building是to keep 的宾语,主语是某个不知名的人demolish了这个builing来keep it from falling down.)
Awkward: TO ERR is human.
Right: IT is human TO ERR.
n不定式超用作并与,但是不能做借此宾语,也不能在前面加形容词和冠词修饰。
动名词比不定式更像名词,可以作动词主语也可以做介词宾语。
简单动名词,更像是动词:EATING apples quickly.
复杂动名词,更像是名词:The quick EATING of apples.
n当一个更熟悉的动作名词已经存在时,不要再创造一个复杂动名词:如the quick consumption of apples 就比 the quick eating of apples好
n一个名词放于动名词之前,如果该名词是动名词的发起者,那么要用所有格。但此时需要注意区分这里的ing究竟是动名词还是一个名词修饰语。
总的来说尽量避免用动名词的所有格,用已存在的动作名词的所有格更好些。如果一定要用动名词的所有格,最好用人称代词如its,their,his,her.
-ing形式可以喝过去分词合并起来使用:Having broken the lamp, she has been worrying all night.
如果没有故意的表目的(如主语是无生命的物体)是,一般用-ing而不用to do。
有一个约定俗成的情况:Water droplets freeze to form snow.虽然也没有目的性,但可以使用不定式。
n在使用现在分词或者关系从句修饰名词时,语意与用不定式修饰名词时有所不同。
现在分词: A technique ALLEVIATING pain is growing popular.
关系从句: A technique THAT ALLEVIATES pain is growing popular
Technique是动作ALLEVIATING 的主语
不定式:A technique TO ALLEVIATE pain is growing popular.
Technique 不一定是TO ALLEVIATE 的主语,可以使某人用来alleviate pain的方式。
又如:There is a book to read. book不是to read的主语,而是read的宾语。
A plan conquering the world is in his files.
A plan that will conquer the world is his files.
A plan to conquer the world is in his files.
计划本身不会去征服世界,肯定是某个使用这个计划去征服世界,这里应该用不定式。
n表示“相似”或者“方式相似”。用like表比较是,是比喻性的,不是真实的。
a)I want to coach divers LIKE Greg Louganis. 此时有歧义!!!
= I want to coach divers WHO ARE LIKE Greg Louganis.
= I want to coach divers in the same way as Greg Louganis does.
b)I want to coach divers, LIKE Greg Louganis. 注意逗号在like之前,此时没歧义
= LIKE Greg Louganis ,I want to coach divers. (he coaches divers; I want to do so.)
nunlike 和like 用法类似:注意即便unlike比较的两个东西不想象,结构上也要平行。
Duration as: As I strolled to the store, I smelled the air. (while, during) 当…时候
Causation as: I will not tell you, as you already know. (since, because) 因为
Comparison as: You should walk as she wants you to. (in the same way) 正如,像….一样
其中as作为comparison比较的用法最重要:
as可以和just,so, so too一起出现:
Right: JUST AS the trains were late yesterday, the buses are late today.
Right: JUST AS the trains were late yesterday, SO TOO are they late today. 部分倒装
As也可以和一个词组共同出现:AS in the previous case, the judge took an early break.
As your leader,I am in charge.作为…角色.
I think of you as my friend. 视作,等同于
AS a child, I thought I could fly.当处于……阶段
a)Times + as…as:Right: The man is FIVE TIMES AS OLD AS his grandson.
The cost of a ticket is $12, six times the cost ten years ago.
The concert was attended by 300 people, twice the previous attendance.
I am TEN years OLDER THAN you.我的年龄= 你的年龄+10
1.More/less用法很灵活,可以作名词、代词、形容词或副词。
I own more than I should. 名词 (more = noun or pronoun)我拥有更多的东西比我应该拥有的;
I own more shirts than I should. 形容词
I sleep more than I should. 副词
2.High/low和higher/lower只能做形容词
×I spend lower than I did last year.
√I spend LESS than I did last year.
√My bills are lower than they were last year.
错:We have even more efficient engines than before.
对:We have even more engines that are efficient than before.发动机数量的比较
对:We have engines even more efficient than before. 有效性的比较
nExceed,surpass这样的动词,也表示比较。但是比较对象务必平行。
Wrong: The incidence of the disease among men exceeds women
Right: The incidence of the disease among men EXCEEDS the incidence among women.
Right: The incidence of the disease among men EXCEEDS its incidence among women.
Right: The incidence of the disease among men EXCEEDS that among wome
通常放在句首,添加另外的一个例子。 翻译为 除了…..
IN ADDITION TO taxes, death is inevitable . (添加在主语)
cheese, I like Swiss. ( 添加在宾语)
1.Having been shown into the office, Julia waited for the dentist to arrive.
正确。Having been shown是分词,不是有效动词。逗号前的整个部分作为分词词组修饰动词waited。
尽管如此,Having been shown有动词特征,类似于一个过去完成时、被动语态的动词。
助动词to be这里以been的形式出现,并且是被动语态。动词to have以having的形式,表示being shown into the office这个动作发生在Julia waited for the dentist之前。语意是符合逻辑的。
2.When he swam across the lake, he struggled to keep his head above the water.
正确。swam和struggled都是用的一般过去式,这两个动作肯定是同时发生的,正确。
3.When he swam across the lake, he lay down on the far shore and relaxed in the sunshine until he was thoroughly dry.
Lay和relax都是一般过去式,swim across the lake必须是发生在这两个动作前,应该用过去完成时。
4.Helen would feel better if she was my daughter.
if假设虚拟,将来不太可能发生:if X were to happen, Y would happen)
If she ate pizza tomorrow, (then) she would/could become ill. (使用虚拟语气)
5.Helen may fell better if she would swallow this pill.
表示某种程度的不确定: if present, then can or may
If she eats pizza, (then) she may /can become ill.
6.If the supplier has signed a binding contract, he will deliver the goods.
将来确定:if present/present perfect,then future.(if X happens/has happened, Y will happen.)
If she eats pizza tomorrow, (then) she will become ill.
If Sophie HAS EATEN pizza, then she WILL BECOME ill.
正确。注意这里用的现在完成时,表示作者是在谈论在过去的某个不特定时间签合同的可能性。相反,如果用一般式也对,但是值得是将来签约的可能性。
7.If the supplier has signed a binding contract, he would have delivered the goods.
过去从未发生: if past perfect,then conditional perfect
(If X had happened, Y would/could have happened)
If she had eaten pizza yesterday, (then) she would/could have become ill. (使用虚拟语气)
8.If Abraham Lincoln were born in Livonia, he cannot become the Present of the United States.
同7.were born -> had been born; cannot become->could not have become
9.Brokered by the President of Silonia, the ceasefire agreement mandates Carpathian forces will cease their advance into Zapadnia, but allows them to engage in limited operations in areas already captured.
Borkered正确,这里是做修饰语而不是实义动词。分词词组borkered by the president of silonia修饰the ceasefire agreement。
Carpathian forces will改为that Carpathian forces cease,因为动词mandate后面必须that虚拟从句。
them to engage正确,allow接不定式
10.Because epidemiological evidence suggests that some tomatoes are contaminated with bacteria, Rachel suggested that Patrick make a salad without tomatoes.
正确。suggest表“可能代表”的意思时,而不是表达“建议”的意思时不能用虚拟语气。所以第一个suggest用陈述语气,第二个suggest用虚拟语气
11.It is necessary that our condominium association must comply with the new ordinance, which requires homeowners clear the snow from sidewalks in front of their property.
must comply应该用虚拟语气comply。It’s necessary 可以接不定式或者虚拟语气。这里由于使用了that从句,所以用虚拟语气。
Clear改成to clear。Require既可以接虚拟语气也可以接不定式。这里因为没有使用that从句,所以改成不定式。
12.A frightening storm has been lashing South Padre Island, forcing Natalie and Todd to postpone their wedding.
Frightening是一个形容词修饰storm。
Has been lashing 是现在完成进行时的实义动词。
分词forcing作为一个副词修饰第一个句子中的has been lashing。完整的副词实际是整个分词从句 forcing Natalie and Todd to postpone their wedding.正如许多的分词副词,他告诉我们的是它修饰的句子的动作的结果。
13.Sitting at the kitchen table, a decision to bake a cake got made by Eric.
2)被动语态,导致好像是decision来执行sitting at the kitchen table。
3)动词中使用了got做助动词,被动语态中只能使用to be做助动词。
修改为Sitting at the kitchen table, Eric decided to bake a cake.
14.Airline A does not charge passengers for in-flight snacks, although most other airlines are.
Are改成do。第一个句子的完整动词词组是does not charge passengers for in-flight snacks。第二个句子可以用do作为do charge passengers for in-flight snacks的简略说法。
15.Louise wanted to buy something to eat, so she stopped at the ATM to withdraw some cash.
To buy充当名词。准确地说,完整的词组to buy something to eat serves 一起当做一个名词,共同做want的宾语。
To eat充当形容词,修饰代词something。
To withdraw充当副词,准确的说是to withdraw some cash 修饰动词stopped,告诉我们Louise停下来的目的。
16.To athlete’s wearing the Brand X logo is a famous Olympian;his swimming has led to a lucrative endorsement contract.
Athlete’s wearing 改为 athlete wearing。Athlete’s wearing中athlete’s作为形容词修饰分词词组wearing…logo.而athlete wearing中分词词组wearing…logo作为形容词修饰名词athlete。要判断那个正确要看句子剩余部分,是谁还是是什么是famous Olympian,是wearing还是athlete,明显是athlete。
His swimming是正确的,是swimming本身led to a lucrative endorsement contract.
17.The person in the recording sounds LIKE a child.
比较,a child是个名词,不是从句,用like。
18.AS a child has been injured, we must stop the party and call an ambulance.
19.AS a child, Rebecca lived in Bristol.
20.My grandfather eats LIKE a child, slurping loudly and helping himself to plenty of ketchup.
比较,a child是个名词,不是从句,用like。
21.Mrs.Jones watched AS a child played with a stick.
22.Frankie never went to law school, but he believes that years of watching Law&Order have taught him to think LIKE a lawyer.
比较,a lawyer是个名词,不是从句,用like。
23.Eyewitnesses describe the missing passenger AS a lawyer in his late forties.
24.LIKE lawyers, doctors are bound by a code of professional ethics.
比较,a lawyer是个名词,不是从句,用like。
25.Having passed the state bar exam, she is licensed to work AS a lawyer in Illinois.
C. Comparison Signals, Comparatives 和 Superlatives
26.Tatiana analyzes people LIKE Oliver Sacks, the famous neurologist.
a)Tatiana analyzes people who are similar to Oliver Sacks, the famous neurologist.
b)Tatiana analyzes people in the same way as Oliver Sacks, the famous neurologist.
注意,b句的意思不能改成Like Oliver Sacks, the famous neurologist, Tatiana analyzes people.这句话的意思是Oliver Sacks analyzes people, and so does Tatiana.并没有告诉T分析人类的方式。
27.Of all the cities in Australia, Sydney is the largest and the most well-known; Melbourne, however, can be equally as enjoyable to visit as its brasher, more frenetic rival.
Most well-> best;
Equally as…as->重复了,可以去掉equally(GMAT中绝对不适用equally!)
第二句是两者比较,用比较级,而不用最高级,brasher,more frenetic是正确的。
28.There are about the equivalent number of gym members in the boxing class as in the aerobics class.
The equivalent number -> as many
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