关于prep 2--43 分词修饰的疑惑

葵之夏影 · 发表于 2010-1-17 10:39:44

Although ice particles in the upper atmosphere benefit Earth in that they reflect and absorb solar radiation, acting as a global thermostat and thus keeping Earth from either burning up or freezing over, they also accelerate the destruction of the ozone layer by reacting with chlorofluorocarbons (CFC's).
A. acting as a global thermostat and thus keeping Earth from either burning up or freezing over, they also accelerate
B. acting as a global thermostat and thus keeping Earth either from burning up or freezing over, while also accelerating
C. act as a global thermostat and thus keep Earth from either burning up or freezing over, while also accelerating
D. they act as a global thermostat that thus keeps Earth either from burning up or freezing over, even though it also accelerates
E. they act as a global thermostat to thus keep Earth from either burning up or freezing over, but they also accelerate
答案选择A 这个没有疑惑

可是对acting as a global thermostat and thus keeping Earth from either burning up or freezing over

作用有疑惑按照题目含义理解应该是作为状语成分修饰前句they reflect and absorb solar radiation

但是也可以作为定语修饰solar radiation

如果这样，应该会产生修饰歧义

help

tibet · 发表于 2010-1-17 17:22:55

现在分词可以做后置定语？
查查语法书吧
前面说的都对啊，别想多了

葵之夏影 · 发表于 2010-1-17 18:16:55

comma, +ving
Ving 是可以作 adjectival modifier 啊

tibet · 发表于 2010-1-17 18:20:14

comma, +ving
Ving 是可以作 adverbial modifier
作伴随，动作，目的是可以修饰啊，形式主语是前面的主语

现在分词没有做后置定语的

葵之夏影 · 发表于 2010-1-17 18:29:31

prep

The Chicago and Calumet Rivers originally flowed into the St. Lawrence by way of Lake Michigan, but having been redirected by constructing canals so that the water now empties into the Mississippi by way of the Illinois River.

(A) Rivers originally flowed into the St. Lawrence by way of Lake Michigan, but having been redirected by constructing
(B) Rivers had originally flowed into the St. Lawrence by way of Lake Michigan, but they have been redirected by constructing
(C) Rivers, which originally flowed into the St. Lawrence by way of Lake Michigan but have been redirected by the construction of
(D) Rivers, originally flowing into the St. Lawrence by way of Lake Michigan, but having been redirected by the construction of
(E) Rivers, originally flowing into the St. Lawrence by way of Lake Michigan, have been redirected through the construction of

OA is E

tibet · 发表于 2010-1-17 19:00:48

LZ累了我半天啊，算是找到了

Punctuation: When a participial phrase begins a sentence, a comma should be placed after the phrase.

Arriving at the store, I found that it was closed.
Washing and polishing the car, Frank developed sore muscles.
If the participle or participial phrase comes in the middle of a sentence, it should be set off with commas only if the information is not essential to the meaning of the sentence.

Sid, watching an old movie, drifted in and out of sleep.
The church, destroyed by a fire, was never rebuilt.
Note that if the participial phrase is essential to the meaning of the sentence, no commas should be used:

The student earning the highest grade point average will receive a special award.
The guy wearing the chicken costume is my cousin.
If a participial phrase comes at the end of a sentence, a comma usually precedes the phrase if it modifies an earlier word in the sentence but not if the phrase directly follows the word it modifies.

The local residents often saw Ken wandering through the streets.
(The phrase modifies Ken, not residents.)
Tom nervously watched the woman, alarmed by her silence.
(The phrase modifies Tom, not woman.)

tibet · 发表于 2010-1-17 19:04:23

所以我认为PREP的解释也有点问题哦
不知道英语分状语和定语不，还是都叫modifier

反正带逗号时候，把现在分词短语看作定语，太牵强了。如果不带逗号，你说是定语，那有点意思

tibet · 发表于 2010-1-17 19:05:21

Sid, watching an old movie, drifted in and out of sleep.
The guy wearing the chicken costume is my cousin.
这两个例句经典啊

tibet · 发表于 2010-1-17 19:14:57

http://owl.english.purdue.edu/owl/resource/627/02/
看链接里面关于分词讲解
Participles
Summary: This handout provides a detailed overview (including descriptions and examples) of gerunds, participles, and infinitives.
Contributors

urdue OWL
Last Edited: 2010-01-08 12:04:39
A participle is a verbal that is used as an adjective and most often ends in -ing or -ed. The term verbal indicates that a participle, like the other two kinds of verbals, is based on a verb and therefore expresses action or a state of being. However, since they function as adjectives, participles modify nouns or pronouns. There are two types of participles: present participles and past participles. Present participles end in -ing. Past participles end in -ed, -en, -d, -t, or -n, as in the words asked, eaten, saved, dealt, and seen.

The crying baby had a wet diaper.
Shaken, he walked away from the wrecked car.
The burning log fell off the fire.
Smiling, she hugged the panting dog.
A participial phrase is a group of words consisting of a participle and the modifier(s) and/or (pro)noun(s) or noun phrase(s) that function as the direct object(s), indirect object(s), or complement(s) of the action or state expressed in the participle, such as:

Removing his coat, Jack rushed to the river.
The participial phrase functions as an adjective modifying Jack.
Removing (participle)
his coat (direct object of action expressed in participle)

Delores noticed her cousin walking along the shoreline.
The participial phrase functions as an adjective modifying cousin.
walking (participle)
along the shoreline (prepositional phrase as adverb)

Children introduced to music early develop strong intellectual skills.
The participial phrase functions as an adjective modifying children.
introduced (to) (participle)
music (direct object of action expressed in participle)
early (adverb)

Having been a gymnast, Lynn knew the importance of exercise.
The participial phrase functions as an adjective modifying Lynn.
Having been (participle)
a gymnast (subject complement for Lynn, via state of being expressed in participle)

Placement: In order to prevent confusion, a participial phrase must be placed as close to the noun it modifies as possible, and the noun must be clearly stated.

Carrying a heavy pile of books, his foot caught on a step. *
Carrying a heavy pile of books, he caught his foot on a step.
In the first sentence there is no clear indication of who or what is performing the action expressed in the participle carrying. Certainly foot can't be logically understood to function in this way. This situation is an example of a dangling modifier error since the modifier (the participial phrase) is not modifying any specific noun in the sentence and is thus left "dangling." Since a person must be doing the carrying for the sentence to make sense, a noun or pronoun that refers to a person must be in the place immediately after the participial phrase, as in the second sentence.

Punctuation: When a participial phrase begins a sentence, a comma should be placed after the phrase.

Arriving at the store, I found that it was closed.
Washing and polishing the car, Frank developed sore muscles.
If the participle or participial phrase comes in the middle of a sentence, it should be set off with commas only if the information is not essential to the meaning of the sentence.

Sid, watching an old movie, drifted in and out of sleep.
The church, destroyed by a fire, was never rebuilt.
Note that if the participial phrase is essential to the meaning of the sentence, no commas should be used:

The student earning the highest grade point average will receive a special award.
The guy wearing the chicken costume is my cousin.
If a participial phrase comes at the end of a sentence, a comma usually precedes the phrase if it modifies an earlier word in the sentence but not if the phrase directly follows the word it modifies.

The local residents often saw Ken wandering through the streets.
(The phrase modifies Ken, not residents.)
Tom nervously watched the woman, alarmed by her silence.
(The phrase modifies Tom, not woman.)
Points to remember

A participle is a verbal ending in -ing (present) or -ed, -en, -d, -t, or -n (past) that functions as an adjective, modifying a noun or pronoun.
A participial phrase consists of a participle plus modifier(s), object(s), and/or complement(s).
Participles and participial phrases must be placed as close to the nouns or pronouns they modify as possible, and those nouns or pronouns must be clearly stated.
A participial phrase is set off with commas when it:
a) comes at the beginning of a sentence
b) interrupts a sentence as a nonessential element
c) comes at the end of a sentence and is separated from the word it modifies.

葵之夏影 · 发表于 2010-1-17 19:24:37

非常感谢啊~！
呵呵解决了偶困惑很久的东东
太棒了~

本贴相关题目 GMATPrep-2007E2-SC-43 (SNOG)

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