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Need Explanation on Complex Parallelism Rule for Prepositions

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GMAT 1: 590 Q46 V27
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Need Explanation on Complex Parallelism Rule for Prepositions  [#permalink]

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New post 27 Aug 2015, 12:23
I probably have a fundamental flaw in my understanding of the following concept. Hope to get some insight.

I have the following 2 sentences:
Correct Sentence
1. During the eighteenth century, widespread changes in agriculture, known as the agrarian revolution involved the large-scale introduction of enclosed fields and of new farming techniques and crops, and the substitution of commercial for subsistence farming.

Incorrect Sentence
2. During the eighteenth century, widespread changes in agriculture, known as the agrarian revolution involved the large-scale introduction of enclosed fields, new farming techniques and crops and the substitution of commercial for subsistence farming.


Why is sentence 2 incorrect? Can I not break sentence 2 in the following way:
During the eighteenth century, widespread changes in agriculture, known as the agrarian revolution involved
the large-scale introduction of
a)enclosed fields,
b)new farming techniques
and
c)crops,
and the substitution of commercial for subsistence farming.


What makes sentence 1 correct? Its structure according to the way I look at it is of the form:
During the eighteenth century, widespread changes in agriculture, known as the agrarian revolution involved
the large-scale introduction of
a)enclosed fields
and of
b)new farming techniques
and
c)crops,
and the substitution of commercial for subsistence farming.


Here are 2 more sentences:
Correct Sentence
The discovery that Earth's inner core rotates independently of and more quickly than Earth's outer layers is responsible for advancing studies of
a)the flow of heat from the inner through the outer planet
and of
b)the formation and periodic reversal in direction of Earth's magnetic field.
(After we have said ....studies OF, why do we need to repeat OF between the two items?)

Incorrect Sentence
The discovery that Earth's inner core rotates independently of and more quickly than Earth's outer layers is responsible for advancing studies of
how heat from the inner core flows through the outer planet,
and
the formation and periodic reversal in direction of Earth's magnetic field.
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Concentration: Technology, Strategy
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GPA: 3.2
Re: Need Explanation on Complex Parallelism Rule for Prepositions  [#permalink]

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New post 27 Aug 2015, 12:46
hiajit wrote:
I probably have a fundamental flaw in my understanding of the following concept. Hope to get some insight.

I have the following 2 sentences:
Correct Sentence
1. During the eighteenth century, widespread changes in agriculture, known as the agrarian revolution involved the large-scale introduction of enclosed fields and of new farming techniques and crops, and the substitution of commercial for subsistence farming.

Incorrect Sentence
2. During the eighteenth century, widespread changes in agriculture, known as the agrarian revolution involved the large-scale introduction of enclosed fields, new farming techniques and crops and the substitution of commercial for subsistence farming.


Why is sentence 2 incorrect? Can I not break sentence 2 in the following way:
During the eighteenth century, widespread changes in agriculture, known as the agrarian revolution involved
the large-scale introduction of
a)enclosed fields,
b)new farming techniques
and
c)crops,
and the substitution of commercial for subsistence farming.


What makes sentence 1 correct? Its structure according to the way I look at it is of the form:
During the eighteenth century, widespread changes in agriculture, known as the agrarian revolution involved
the large-scale introduction of
a)enclosed fields
and of
b)new farming techniques
and
c)crops,
and the substitution of commercial for subsistence farming.


Here are 2 more sentences:
Correct Sentence
The discovery that Earth's inner core rotates independently of and more quickly than Earth's outer layers is responsible for advancing studies of
a)the flow of heat from the inner through the outer planet
and of
b)the formation and periodic reversal in direction of Earth's magnetic field.
(After we have said ....studies OF, why do we need to repeat OF between the two items?)

Incorrect Sentence
The discovery that Earth's inner core rotates independently of and more quickly than Earth's outer layers is responsible for advancing studies of
how heat from the inner core flows through the outer planet,
and
the formation and periodic reversal in direction of Earth's magnetic field.


The very basic answer would be in the second version of the first example (incorrect one) you are unnecessarily clubbing two entities "new farming techniques"
and "corps" whereas the sentence would be correct only if all the four entities are in parallel to each other.

a)enclosed fields
b)new farming techniques
c)crops
d)substitution of commercial for subsistence farming.
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Re: Need Explanation on Complex Parallelism Rule for Prepositions  [#permalink]

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New post 28 Aug 2015, 06:19
Can't understand that. I am looking for the right parallelism structure in this case. You can follow the discussions on both these examples on the links below:
bit.ly/1hkPIai
bit.ly/1KS97Hd
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Need Explanation on Complex Parallelism Rule for Prepositions  [#permalink]

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New post 18 Feb 2019, 00:39
CORRECT
1. During the eighteenth century, widespread changes in agriculture, known as the agrarian revolution
involved the large-scale in troduction of enclosed fields and of new farming techniques and crops
, and the substitution of commercial for subsistence farming.

Two different lists with two components each(Meaning wise makes sense)

INCORRECT
2. During the eighteenth century, widespread changes in agriculture, known as the agrarian revolution involved the large-scale introduction of enclosed fields, new farming techniques and crops and the substitution of commercial for subsistence farming.

One list with 3 components (Incorrect because same type of things should be compared in parallel structure ) and another list with two components which is fine

CORRECT
The discovery that Earth's inner core rotates independently of and more quickly than Earth's outer layers is responsible for advancing studies
of the flow of heat from the inner through the outer planet
and
of the formation and periodic reversal in direction of Earth's magnetic field.

INCORRECT
The discovery that Earth's inner core rotates independently of and more quickly than Earth's outer layers is responsible for advancing studies of
how heat from the inner core flows through the outer planet,
and
the formation and periodic reversal in direction of Earth's magnetic field.[/quote]

second list draws parallel between Clause and Phrase
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Need Explanation on Complex Parallelism Rule for Prepositions   [#permalink] 18 Feb 2019, 00:39
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