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IMO D;
A) wagons, with high wheels capable of crossing rutted roads, muddy flats, and the nonroads of the prairie and they had a floor curved upward on either end so as to prevent ; modifer error

B) wagons, with high wheels capable of crossing rutted roads, muddy flats, and the nonroads of the prairie, and with a floor that was curved upward at both ends to prevent; same as A

C) wagons, which had high wheels capable of crossing rutted roads, muddy flats, and the nonroads of the prairie, and floors curved upward on their ends so that they prevented ; use of , which modifies conestoga wagons , but use of words 'floors, they prevented ' makes sentence akward as reference is not clear

E) wagons had high wheels capable of crossing rutted roads, muddy flats, and the nonroads of the prairie and floors curving upward at their ends so that it prevented ; referent it is wrong


D) wagons had high wheels capable of crossing rutted roads, muddy flats, and the nonroads of the prairie, and a floor that was curved upward at both ends to prevent; correct sentence ..



generis
Developed by Pennsylvania's Palatine Germans about 1750, Conestoga wagons, with high wheels capable of crossing rutted roads, muddy flats, and the nonroads of the prairie and they had a floor curved upward on either end so as to prevent cargo from shifting on steep grades.

A) wagons, with high wheels capable of crossing rutted roads, muddy flats, and the nonroads of the prairie and they had a floor curved upward on either end so as to prevent

B) wagons, with high wheels capable of crossing rutted roads, muddy flats, and the nonroads of the prairie, and with a floor that was curved upward at both ends to prevent

C) wagons, which had high wheels capable of crossing rutted roads, muddy flats, and the nonroads of the prairie, and floors curved upward on their ends so that they prevented

D) wagons had high wheels capable of crossing rutted roads, muddy flats, and the nonroads of the prairie, and a floor that was curved upward at both ends to prevent

E) wagons had high wheels capable of crossing rutted roads, muddy flats, and the nonroads of the prairie and floors curving upward at their ends so that it prevented

This official question is similar but not identical to an official question that can be found HERE.
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egmat Can you please explain why D is correct with your approach

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Developed by Pennsylvania's Palatine Germans about 1750, Conestoga wagons, with high wheels capable of crossing rutted roads, muddy flats, and the nonroads of the prairie and they had a floor curved upward on either end so as to prevent cargo from shifting on steep grades.

A) wagons, with high wheels capable of crossing rutted roads, muddy flats, and the nonroads of the prairie and they had a floor curved upward on either end so as to prevent - the definite pronoun 'they' has no clear antecedent. Hence, eliminate (A)

B) wagons, with high wheels capable of crossing rutted roads, muddy flats, and the nonroads of the prairie, and with a floor that was curved upward at both ends to prevent - the overall structure of this sentence now becomes "Wagon, with......., and with......). This does not make any sense.

To understand why, let us use a parallel example that has this 'with' clause structure : My car, with a floor that was curved upward at both ends to prevent grocery bags from shifting on steep grades. - this does not make any sense whatsoever.

hence, eliminate (B)

C) wagons, which had high wheels capable of crossing rutted roads, muddy flats, and the nonroads of the prairie, and floors curved upward on their ends so that they prevented - The wagons had wheels.... and floors curved upward on their ends so that they prevented...??? This does not make any sense. Hence, eliminate (C)

D) wagons had high wheels capable of crossing rutted roads, muddy flats, and the nonroads of the prairie, and a floor that was curved upward at both ends to prevent - Has no error. Hence, (D) is the right answer choice.

E) wagons had high wheels capable of crossing rutted roads, muddy flats, and the nonroads of the prairie and floors curving upward at their ends so that it prevented - 'their' has no clear antecedent. hence, eliminate (E)
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Intended meaning:
- Conestoga wagons developed by Pennsylvania's Palatine Germans about 1750
- Conestoga wagons had high wheels and a floor
- Conestoga wagons is capable of crossing rutted roads, muddy flats, and the nonroads of the prairie, becasue of high wheels
- Contoga wagons had a floor that was curved upward at both ends to prevent cargo from shifting on steep grades

Learning :
1. Modifier - Error in A, B and C
"Developed by Pennsylvania's Palatine Germans about 1750" - Modify - "Conestoga wagons"

2. Verb Tense - Error in C, and E
- had High wheels
- had a floor, not floors
- to prevent cargo, not prevented cargo

3. (,which) non-essential information, (that) essential information

4. Pronoun Error - Option A, and C
- Conestoga wagons is singular,
Pronoun "they / their" plural is not correct antecedent
Pronoun "It" singular is correct antecedent
- Conestoga wagons was not with High wheels and a floor, It had high wheels and a floor

5. Information between two comma - Error A, and B
In option A, and B "Conestoga wagons" mentioned between two comma,
indicate this as a type of additional information wherelse it the main subject, hence makes this as a Modifier error.

6. Article "a", "an" and "the" - Error in C, and E to decribe "floor"


Option A.) Developed by Pennsylvania's Palatine Germans about 1750, Conestoga wagons,
with high wheels capable of crossing rutted roads, muddy flats, and the nonroads of the prairie
and
they had a floor curved upward on either end so as to prevent
cargo from shifting on steep grades.


Option B) Developed by Pennsylvania's Palatine Germans about 1750, Conestoga wagons,
with high wheels capable of crossing rutted roads, muddy flats, and the nonroads of the prairie,
and
with a floor that was curved upward at both ends to prevent
cargo from shifting on steep grades


Option C) Developed by Pennsylvania's Palatine Germans about 1750,
Conestoga wagons, which had
- high wheels capable of crossing rutted roads, muddy flats, and the nonroads of the prairie,
and
- floors curved upward on their ends so that they prevented
cargo from shifting on steep grades


Correct Option D) Developed by Pennsylvania's Palatine Germans about 1750,
Conestoga wagons had
- high wheels capable of crossing rutted roads, muddy flats, and the nonroads of the prairie,
and
- a floor that was curved upward at both ends to prevent
cargo from shifting on steep grades


Option E) Developed by Pennsylvania's Palatine Germans about 1750,
Conestoga wagons had
- high wheels capable of crossing rutted roads, muddy flats, and the nonroads of the prairie
and
- floors curving upward at their ends so that it prevented
cargo from shifting on steep grades
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hello experts,
I wanted to know, the use of 'so as to' and 'so that' is justified here.
I think we use so that - to show a degree. example - so high that....
it seems like both indicates an intention of "the floor/floors"

why exactly are they wrong?
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dcoolguy
hello experts,
I wanted to know, the use of 'so as to' and 'so that' is justified here.
I think we use so that - to show a degree. example - so high that....
it seems like both indicates an intention of "the floor/floors"

why exactly are they wrong?
Better question: do (A), (C), and (E) have other, more concrete issues?

Let's start with (A). If we strip out a few modifiers for a moment, we're left with:

Quote:
Conestoga wagons, and they had a floor curved upward on either end so as to prevent cargo from shifting on steep grades.
We're missing a verb for "Conestoga wagons," so we can eliminate (A) right away.

In choice (C), notice that everything after "Conestoga wagons" is just one big "which" clause:

Quote:
Conestoga wagons, which had (1) high wheels {...}, and (2) floors curved upward on their ends {...}."
So again, we're missing a verb for "Conestoga wagons," and we can eliminate (C) right away.

(E) has a pretty glaring pronoun issue (what does "it" refer to?), so we can eliminate that one too.

So... did the GMAT really want us to worry about "so that" and "so as to"? Not really, and I wouldn't try to invent rules about when you can (or cannot) use those phrases. That said, I think we're used to seeing sentences where "so that"/"so as to" link two distinct clauses/actions. For example:

    "Tim sold his house so that he could buy a yacht."

Notice that the "so that" part tells us more about the first clause or action. Why did Tim sell his house? So that he could buy a yacht. Seems fine.

Now look at the relevant part of (C) again:

Quote:
[Conestoga wagons] {...} had floors curved upward on their ends so that [the floors] prevented cargo from shifting on steep grades.
Given the usage of "so that" demonstrated in the yacht example, it would be perfectly understandable to misread this as, "[Conestoga wagons] had floors {...} so that [the floors] prevented cargo from shifting on steep grades." In other words, we might be inclined to think that "so that" links the two clauses, just as it does in the yacht example. But in (C), the "so that" doesn't go with another clause or action. Instead, it just modifies an -ed modifier ("curved").

Does that mean "so that" is wrong in (C)? I'm not sure, but based on the ideas underneath the yacht example, I'd argue that the simple "to prevent" in (D) is clearer than the "so that they prevented" in (C). Would I eliminate (C) based only on that decision point? Nope. But, given the missing verb issue described above, I'd see this as an extra reason to feel good about ditching (C).[/list]

TL/DR: SC isn't about inventing a list of grammar rules that you can blindly apply to future problems. Look for definite errors first, and then think hard about how the remaining differences affect the meaning and clarity.

I hope that helps!
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