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umaa: Legendary Member; Posts: 727; Joined: Sun Jun 08, 2008 9:32 pm; Thanked: 8 times; Followed by:1 members

by umaa » Mon Dec 21, 2009 8:49 am

mmslf75 wrote:
reachac wrote:To develop more accurate population forecasts, demographers have to know a great deal more than now about the social and economic determinants of fertility.

A. have to know a great deal more than now about the social and economic
B. have to know a great deal more than they do now about the social and economical
C. would have to know a great deal more than they do now about the social and economical
D. would have to know a great deal more than they do now about the social and economic
E. would have to know a great deal more than now about the social and economical
OA here is D,

What's wrong with E

Why cannot we say "KNOW A GREAT DEAL MORE THAN NOW " in lieu of "know a great deal more than they do now"

I have read on BTG / MGMAT forum..dont recall where that when the message is conveyed in the former of the sentence
one need not mention again.. so why here in D we mention ??

Also, if I have a sentence
Tom has always eaten more food than Jerry <has>
Tom has always eaten more food than Jerry < < > >
Tom has always eaten more food than jerry <does>

When does one use DOES/DO/DID in latter part of the sentence, given that we have HAVE/HAS/ in former part of the sentence

What do we use here ???

E is wrong because, ECONOMICAL means thrifty, which is not suitable with the rest of the sentence. Means, changes the meaning.

Also, "more than now" doesn't give any of the below form.

Tom has always eaten more food than Jerry <has>
Tom has always eaten more food than Jerry < < > >
Tom has always eaten more food than jerry <does>

Thats why D is correct.

What we think, we become

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mmslf75: Legendary Member; Posts: 503; Joined: Sun Aug 09, 2009 9:53 pm; Thanked: 31 times; Followed by:2 members

by mmslf75 » Mon Dec 21, 2009 9:13 am

umaa wrote:
mmslf75 wrote:
reachac wrote:To develop more accurate population forecasts, demographers have to know a great deal more than now about the social and economic determinants of fertility.

A. have to know a great deal more than now about the social and economic
B. have to know a great deal more than they do now about the social and economical
C. would have to know a great deal more than they do now about the social and economical
D. would have to know a great deal more than they do now about the social and economic
E. would have to know a great deal more than now about the social and economical
OA here is D,

What's wrong with E

Why cannot we say "KNOW A GREAT DEAL MORE THAN NOW " in lieu of "know a great deal more than they do now"

I have read on BTG / MGMAT forum..dont recall where that when the message is conveyed in the former of the sentence
one need not mention again.. so why here in D we mention ??

Also, if I have a sentence
Tom has always eaten more food than Jerry <has>
Tom has always eaten more food than Jerry < < > >
Tom has always eaten more food than jerry <does>

When does one use DOES/DO/DID in latter part of the sentence, given that we have HAVE/HAS/ in former part of the sentence

What do we use here ???
E is wrong because, ECONOMICAL means thrifty, which is not suitable with the rest of the sentence. Means, changes the meaning.

Also, "more than now" doesn't give any of the below form.

Tom has always eaten more food than Jerry <has>
Tom has always eaten more food than Jerry < < > >
Tom has always eaten more food than jerry <does>

Thats why D is correct.

If E were to have ECONOMIC then ??
Query is which is better

MORE THAN NOW
OR
more than they do now

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umaa: Legendary Member; Posts: 727; Joined: Sun Jun 08, 2008 9:32 pm; Thanked: 8 times; Followed by:1 members

by umaa » Mon Dec 21, 2009 9:27 am

I've already given explanation for your query. I believe "more than they do now" is clearer than "more than now".

What we think, we become

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hrishi19884: Master | Next Rank: 500 Posts; Posts: 407; Joined: Sun Nov 29, 2009 1:20 am; Location: India; Thanked: 20 times; Followed by:1 members

by hrishi19884 » Mon Dec 21, 2009 3:16 pm

@reachac - Which source did you get this question from?

Also, can you make out the difference between : "I have to study hard to get good marks"

"I would have to study hard to get good marks"

Which one will you prefer the most?

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gmatmachoman: Legendary Member; Posts: 2326; Joined: Mon Jul 28, 2008 3:54 am; Thanked: 173 times; Followed by:2 members; GMAT Score:710

by gmatmachoman » Mon Dec 21, 2009 10:21 pm

hrishi19884 wrote:@reachac - Which source did you get this question from?

Also, can you make out the difference between : "I have to study hard to get good marks"

"I would have to study hard to get good marks"

Which one will you prefer the most?

This is from OG 12

R&D on GMAT algorithm:

https://www.beatthegmat.com/r-d-on-gmat- ... tml#305739

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lunarpower: GMAT Instructor; Posts: 3380; Joined: Mon Mar 03, 2008 1:20 am; Thanked: 2256 times; Followed by:1535 members; GMAT Score:800

by lunarpower » Mon Dec 28, 2009 12:32 pm

mmslf75 wrote:
reachac wrote:To develop more accurate population forecasts, demographers have to know a great deal more than now about the social and economic determinants of fertility.

A. have to know a great deal more than now about the social and economic
B. have to know a great deal more than they do now about the social and economical
C. would have to know a great deal more than they do now about the social and economical
D. would have to know a great deal more than they do now about the social and economic
E. would have to know a great deal more than now about the social and economical
OA here is D,

What's wrong with E

Why cannot we say "KNOW A GREAT DEAL MORE THAN NOW " in lieu of "know a great deal more than they do now"

I have read on BTG / MGMAT forum..dont recall where that when the message is conveyed in the former of the sentence
one need not mention again.. so why here in D we mention ??

Also, if I have a sentence
Tom has always eaten more food than Jerry <has>
Tom has always eaten more food than Jerry < < > >
Tom has always eaten more food than jerry <does>

When does one use DOES/DO/DID in latter part of the sentence, given that we have HAVE/HAS/ in former part of the sentence

What do we use here ???

whenever you make a comparison, the comparison must involve two parallel structures that are both written. if the sentence lacks such parallel structures, then the comparison is incorrect.

the reason why "tom has always eaten more food than jerry" is a workable comparison is because the two parallel structures are "tom" and "jerry".

similarly, in your first example, the parallel constructions being compared are
tom has always eaten vs. jerry has [always eaten]

the third example is a bit dodgy, although i'm not sure whether i'd label it outright as incorrect. it has a weird transition between tenses; to ground that better, you'd probably want to add an adverb: tom has always eaten more food than jerry currently eats / now eats.

--

so... the problem with
demographers would have to know a great deal more than now

is that there is absolutely nothing on the left-hand side of the sentence to which "now" can be parallel. i.e., the left-hand part of the sentence doesn't mention any sort of time frame.

by contrast, if you say demographers would have to know... vs. they do now (as in the correct answer), these are parallel elements: they're both clauses with demographers = they as their subject.

Ron has been teaching various standardized tests for 20 years.

--

Pueden hacerle preguntas a Ron en castellano
Potete chiedere domande a Ron in italiano
On peut poser des questions Ã Ron en franÃ§ais
Voit esittÃ¤Ã¤ kysymyksiÃ¤ Ron:lle myÃ¶s suomeksi

--

Quand on se sent bien dans un vÃªtement, tout peut arriver. Un bon vÃªtement, c'est un passeport pour le bonheur.

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--

Learn more about ron

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mmslf75: Legendary Member; Posts: 503; Joined: Sun Aug 09, 2009 9:53 pm; Thanked: 31 times; Followed by:2 members

by mmslf75 » Tue Jan 12, 2010 9:20 pm

mmslf75 wrote:
reachac wrote:To develop more accurate population forecasts, demographers have to know a great deal more than now about the social and economic determinants of fertility.

A. have to know a great deal more than now about the social and economic
B. have to know a great deal more than they do now about the social and economical
C. would have to know a great deal more than they do now about the social and economical
D. would have to know a great deal more than they do now about the social and economic
E. would have to know a great deal more than now about the social and economical
OA here is D,

What's wrong with E

Why cannot we say "KNOW A GREAT DEAL MORE THAN NOW " in lieu of "know a great deal more than they do now"

I have read on BTG / MGMAT forum..dont recall where that when the message is conveyed in the former of the sentence
one need not mention again.. so why here in D we mention ??

Also, if I have a sentence
Tom has always eaten more food than Jerry <has>
Tom has always eaten more food than Jerry < < > >
Tom has always eaten more food than jerry <does>

When does one use DOES/DO/DID in latter part of the sentence, given that we have HAVE/HAS/ in former part of the sentence

What do we use here ???

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lunarpower: GMAT Instructor; Posts: 3380; Joined: Mon Mar 03, 2008 1:20 am; Thanked: 2256 times; Followed by:1535 members; GMAT Score:800

by lunarpower » Wed Jan 13, 2010 3:51 am

mmslf75 wrote:
mmslf75 wrote:
reachac wrote:To develop more accurate population forecasts, demographers have to know a great deal more than now about the social and economic determinants of fertility.

A. have to know a great deal more than now about the social and economic
B. have to know a great deal more than they do now about the social and economical
C. would have to know a great deal more than they do now about the social and economical
D. would have to know a great deal more than they do now about the social and economic
E. would have to know a great deal more than now about the social and economical
OA here is D,

What's wrong with E

Why cannot we say "KNOW A GREAT DEAL MORE THAN NOW " in lieu of "know a great deal more than they do now"

I have read on BTG / MGMAT forum..dont recall where that when the message is conveyed in the former of the sentence
one need not mention again.. so why here in D we mention ??

Also, if I have a sentence
Tom has always eaten more food than Jerry <has>
Tom has always eaten more food than Jerry < < > >
Tom has always eaten more food than jerry <does>

When does one use DOES/DO/DID in latter part of the sentence, given that we have HAVE/HAS/ in former part of the sentence

What do we use here ???
usually, when you omit verbs like that, you're omitting a verb that's in the same tense as the original verb.

for instance, if you wrote
tom has always eaten more food than jerry
...then the IMPLICATION is
tom has always eaten more food than jerry has.
in other words, if the verb is omitted, then you're (usually, from what i've seen) implying that the omitted verb is of the same tense as whatever other verb appears in the construction.

i.e., in your other sentence - Tom has always eaten more food than jerry <does> - you can't omit the "does", since that omission would destroy the second time frame.

--

if you understand the difference between "economic" and "economical", though, then this isn't a problem in the first place (since "economical" is quite incorrect).

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mmslf75: Legendary Member; Posts: 503; Joined: Sun Aug 09, 2009 9:53 pm; Thanked: 31 times; Followed by:2 members

by mmslf75 » Wed Jan 13, 2010 7:28 am

thanks ron,

oh yes, i understood economical here is incorrect

besides, can u give few takeaways on the usage of WOULD vs WILL !?

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lunarpower: GMAT Instructor; Posts: 3380; Joined: Mon Mar 03, 2008 1:20 am; Thanked: 2256 times; Followed by:1535 members; GMAT Score:800

by lunarpower » Tue Jan 26, 2010 3:30 am

mmslf75 wrote:thanks ron,

oh yes, i understood economical here is incorrect ;-)

besides, can u give few takeaways on the usage of WOULD vs WILL !?

"will" is future tense.

"will" also has a second, VERY infrequent, use as an emphatic statement of things that would otherwise be stated in the present tense.
for instance:
my cousin runs into things, bumps into walls, and will occasionally even slam into old ladies on the street!
this sentence would also be ok with all three verbs in the present tense, but the use of the future adds a special emphasis.

the only reason why i'm pointing out this obscure use of "will" is that it's actually used in one of the OG correct answers. see #46 in the DIAGNOSTIC section (not the normal SC section) of either og11 or og12.

--

"would" has 2 main uses:

1 * it's the past tense of "will". i have no idea what the actual name of this tense is, but you can think of it as "a tense that WAS the future, at that time in the past."
for instance:
Jim knows that his son will make the game-winning shot.
this sentence translates into the past tense as
Jim knew that his son would make the game-winning shot.

2 * it's a CONDITIONAL - i.e., it describes what would occur in some alternate situation that is not actually the case.
for instance:
if i were rich, i would buy my own island.

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BlindVision: Master | Next Rank: 500 Posts; Posts: 253; Joined: Fri Dec 26, 2008 8:39 pm; Thanked: 8 times; Followed by:1 members

by BlindVision » Tue Aug 02, 2011 4:58 pm

reachac wrote:To develop more accurate population forecasts, demographers have to know a great deal more than now about the social and economic determinants of fertility.

A. have to know a great deal more than now about the social and economic
B. have to know a great deal more than they do now about the social and economical
C. would have to know a great deal more than they do now about the social and economical
D. would have to know a great deal more than they do now about the social and economic
E. would have to know a great deal more than now about the social and economical

There is a correction that needs to be pointed out in choice E
The word "economical" should be "economic", thefore, choice E should read...

E. would have to know a great deal more than now about the social and economic

Life is a Test

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naveen451: Senior | Next Rank: 100 Posts; Posts: 60; Joined: Sat Jul 16, 2011 11:56 pm; Location: hyderabad; Thanked: 2 times; Followed by:1 members

by naveen451 » Wed Aug 03, 2011 3:49 am

IMO E

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lunarpower: GMAT Instructor; Posts: 3380; Joined: Mon Mar 03, 2008 1:20 am; Thanked: 2256 times; Followed by:1535 members; GMAT Score:800

by lunarpower » Thu Aug 04, 2011 3:29 am

BlindVision wrote:There is a correction that needs to be pointed out in choice E
The word "economical" should be "economic", thefore, choice E should read...

E. would have to know a great deal more than now about the social and economic

just to clarify -- choice (e) is still an incorrect answer; this poster is just pointing out that choice (e) is not transcribed the same way that it is written in the official guide.

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Fractal: Master | Next Rank: 500 Posts; Posts: 183; Joined: Sun Aug 22, 2010 1:02 am; Location: Switzerland; Thanked: 5 times

by Fractal » Tue Aug 23, 2011 1:46 pm

D. would have to know a great deal more than they do now about the social and economic

Would D. also be correct as followed:

D. have to know a great deal more than they do now about the social and economic

... or is the addition of "would" necessary?

thx

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lunarpower: GMAT Instructor; Posts: 3380; Joined: Mon Mar 03, 2008 1:20 am; Thanked: 2256 times; Followed by:1535 members; GMAT Score:800

by lunarpower » Wed Aug 24, 2011 5:22 am

Fractal wrote:D. would have to know a great deal more than they do now about the social and economic

Would D. also be correct as followed:

D. have to know a great deal more than they do now about the social and economic

... or is the addition of "would" necessary?

thx

no -- that's the same tense as "do", creating a sentence that contradicts itself.

the sentence would work with "would" (implying a purely hypothetical consideration); it would also work with "will" in that place (implying a reasonable chance that this will be possible in the future).

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