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SC 4th Ch3 Parallerism - Q9(the blizzard)

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returnKama
 Post subject: SC 4th Ch3 Parallerism - Q9(the blizzard)
 Post Posted: Wed Nov 18, 2009 9:25 am 
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SC 4th Ch3 Parallerism - Q9(the blizzard)

The blizzard deposited more than a foot of snow on the train tracks, prompted the transit authority to shut down service temporarily, and causing discontent among commuters who were left stranded for hours

A: The blizzard deposited more than a foot of snow on the train tracks, prompting the transit authority to shut down service temporarily and causing discontent among commuters who were left stranded for hours

I can understand answer which change "PROMPTED" to "PROMPTING".
But why comma was removed in the answer? It is not clear for me.
Can comma be added in front of "and", if parallel clause is long or independent?
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esledge
 Post subject: Re: SC 4th Ch3 Parallerism - Q9(the blizzard)
 Post Posted: Sun Feb 28, 2010 10:42 pm 
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Location: St. Louis, MO
returnKama wrote:
I can understand answer which change "PROMPTED" to "PROMPTING".
But why comma was removed in the answer? It is not clear for me.
Can comma be added in front of "and", if parallel clause is long or independent?

The comma was removed because "prompting" (a modifier--the result of main clause "the blizzard deposited...") is only parallel with one other modifier/result. In a list of two things (e.g. "X and Y") you don't put any commas between the items.

The blizzard deposited more than a foot of snow on the train tracks, prompting the transit authority to shut down service temporarily and causing discontent among commuters who were left stranded for hours.

With detail removed: The blizzard deposited (some snow), prompting (something) and causing (something else).

The comma was actually there in the original to mislead you: to tempt you read the parallel structure as "X, Y, and Z."

The blizzard deposited (some snow), prompted (something), and causing (something else).

If the END of the sentence were underlined (i.e. if "causing" could be changed to "caused"), then you would put that comma before "and."

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Emily Sledge
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ManhattanGMAT
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parveenjain
 Post subject: Re: SC 4th Ch3 Parallerism - Q9(the blizzard)
 Post Posted: Wed Jul 07, 2010 1:06 pm 
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But it is mentioned in MGMAT SC that long clauses should always be seprated by comma if they are using AND as seprator.Shall we not include the explanation of this fact ?
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tim
 Post subject: Re: SC 4th Ch3 Parallerism - Q9(the blizzard)
 Post Posted: Mon Aug 02, 2010 2:47 pm 
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Location: Southwest Airlines, seat 21C
No we shan't. This clause is not long enough to require a comma..

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Tim Sanders
Manhattan GMAT Instructor
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