Last visit was: 14 Jul 2024, 09:55 It is currently 14 Jul 2024, 09:55
Close
GMAT Club Daily Prep
Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.

Customized
for You

we will pick new questions that match your level based on your Timer History

Track
Your Progress

every week, we’ll send you an estimated GMAT score based on your performance

Practice
Pays

we will pick new questions that match your level based on your Timer History
Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.
Close
Request Expert Reply
Confirm Cancel
SORT BY:
Date
Tags:
Show Tags
Hide Tags
User avatar
SVP
SVP
Joined: 17 May 2007
Posts: 2437
Own Kudos [?]: 1691 [34]
Given Kudos: 210
Send PM
Most Helpful Reply
User avatar
Magoosh GMAT Instructor
Joined: 28 Nov 2011
Posts: 296
Own Kudos [?]: 4591 [14]
Given Kudos: 2
Send PM
User avatar
Haas School Moderator
Joined: 23 Aug 2010
Posts: 195
Own Kudos [?]: 64 [12]
Given Kudos: 34
Concentration: Entrepreneurship, General Management
GPA: 3.3
WE:Design (Other)
Send PM
General Discussion
User avatar
Senior Manager
Senior Manager
Joined: 10 Sep 2007
Posts: 457
Own Kudos [?]: 941 [0]
Given Kudos: 0
 Q50  V34
Send PM
Re: There is substantial evidence that certain forms of solar energy eithe [#permalink]
A. either now or within a few years will be economically competitive with conventional sources of heat and power
This sentence separates subject from verb with awkward phrase of "either now or within a few years". Moreover it does not make any sense when we say "There is substantial evidence that certain forms of solar energy either now will be economically competitive with conventional sources of heat and power". How future will be can describe present activity.

B. will either be economically competitive with conventional sources of heat and power within a few years or are so now
Original sentence is saying either now or within a few years, this option reverses the order so incorrect.

C. will be economically competitive with conventional sources of heat and power either now or within a few years.
Use of "will be" for present situation is incorrect.

D. either are now economically competitive with conventional sources of heat and power or will be so within a few years
In this context "are" and "now" form redundant pair. We can safely ignore "now" and sentence will still make same sense. But this option is superior to other. Use of "so" in or section to correctly refer to verb in either construction is perfect.

E. are either now or will be within a few years economically competitive with conventional sources of heat and power
In this context "are" and "now" do not forms redundant pair, however as such will mean "are" is applied to both "either as well as or construction" which I will say is grammatically flawed. Moreover there is nothing in either construction that refers to verb of or construction.

I think redundancy is still allowable but grammatical mistakes are not, please correct me if I am wrong.

So I will go with D.
User avatar
Manager
Manager
Joined: 03 Nov 2005
Posts: 148
Own Kudos [?]: 112 [0]
Given Kudos: 17
Location: Chicago, IL
Send PM
Re: There is substantial evidence that certain forms of solar energy eithe [#permalink]
[quote="rohitgoel15"]There is substantial evidence that certain forms of solar energy either now or within a few years will be economically competitive with conventional sources of heat and power.
(A) either now or within a few years will be economically competitive with conventional sources of heat and power
(B) will either be economically competitive with conventional sources of heat and power within a few years or are so now
(C) will be economically competitive with conventional sources of heat and power either now or within a few years
(D) either are now economically competitive with conventional sources of heat and power or will be so within a few years
(E) are either now or will be within a few years economically competitive with conventional sources of heat and power


I see the problem with C. "Now" signals the present tense of the verb "be."
If C was like "will be economically competitive with conventional sources of heat and power either shortly or within a few years then C would be the answer.
User avatar
Director
Director
Joined: 17 Feb 2010
Posts: 632
Own Kudos [?]: 3290 [0]
Given Kudos: 6
Send PM
Re: There is substantial evidence that certain forms of solar energy eithe [#permalink]
There is evidence that certain forms of energy either are now competitive..............or will be in few years

There is substantial evidence that certain forms of solar energy either now or within a few years will be economically competitive with conventional sources of heat and power.

(A) either now or within a few years will be economically competitive with conventional sources of heat and power
(B) will either be economically competitive with conventional sources of heat and power within a few years or are so now
(C) will be economically competitive with conventional sources of heat and power either now or within a few years - we cannot say 'will be competitive now'.....thats wrong tense
(D) either are now economically competitive with conventional sources of heat and power or will be so within a few years - 'so' is for the task
(E) are either now or will be within a few years economically competitive with conventional sources of heat and power
User avatar
VP
VP
Joined: 02 Jul 2009
Status:mission completed!
Posts: 1139
Own Kudos [?]: 2137 [1]
Given Kudos: 622
GPA: 3.77
Send PM
Re: There is substantial evidence that certain forms of solar energy eithe [#permalink]
1
Kudos
Hi all,
the trap is that C looks very attractive. but in C either X or Y are not paralel.
Unlike D (either + auxiliary verb + time) + (or + auxiliary verb + time), C is not parallel: either now (adjective) or within (preposition)

hope it helps.
GMAT Club Legend
GMAT Club Legend
Joined: 19 Feb 2007
Status: enjoying
Posts: 5264
Own Kudos [?]: 42142 [0]
Given Kudos: 422
Location: India
WE:Education (Education)
Send PM
Re: There is substantial evidence that certain forms of solar energy eithe [#permalink]
Expert Reply
The sentence means to say that --- There is substantial evidence that certain forms of solar energy either now will be economically competitive or within a few years will be economically competitive with conventional sources of heat and power. You can see the incongruity of the theme --- now will be economically competitive. So any choice that has – now will be economically competitive can be eliminated

Second thing is the adherence to //ism of correlative conjunction.


A. either now or within a few years will be economically competitive with conventional sources of heat and power --- fouls on ---now and will be ---factor. drop

B. will either be economically competitive with conventional sources of heat and power within a few years or are so now --- be economically is not a full verb . So its placement after either is not correlatively // with or are so now. – drop.

C. will be economically competitive with conventional sources of heat and power either now or within a few years ---- fails on now and will be factor. ---drop

D. either are now economically competitive with conventional sources of heat and power or will be so within a few years …correct choice. –no now and will be problem and maintains correlative //ism

E. are either now or will be within a few years economically competitive with conventional sources of heat and power …… -are either now or will be within a few years - is not correlatively parallel.
Director
Director
Joined: 22 Mar 2013
Status:Everyone is a leader. Just stop listening to others.
Posts: 606
Own Kudos [?]: 4647 [0]
Given Kudos: 235
Location: India
GPA: 3.51
WE:Information Technology (Computer Software)
Send PM
Re: There is substantial evidence that certain forms of solar energy eithe [#permalink]
Tough ONE: Initially I was not able to identify error in A, but when I checked variations in all other choices I managed to identify what creator wants us to do.

expended version : now will be or within few year will be -- now will be is not correct -- now represent present tense. Thus, we cant use future tense will.

858. There is substantial evidence that certain forms of solar energy either now or within a few years will be economically competitive with conventional sources of heat and power.
(A) either now or within a few years will be economically competitive with conventional sources of heat and power
(B) will either be economically competitive with conventional sources of heat and power within a few years or are so now -- parallelism error.
(C) will be economically competitive with conventional sources of heat and power either now or within a few years -- modifier error
(D) either are now economically competitive with conventional sources of heat and power or will be so within a few years -- Technically correct construction.
(E) are either now or will be within a few years economically competitive with conventional sources of heat and power -- Parallelism error.
avatar
Intern
Intern
Joined: 03 May 2015
Posts: 43
Own Kudos [?]: 44 [0]
Given Kudos: 48
Send PM
Re: There is substantial evidence that certain forms of solar energy eithe [#permalink]
Request you not to write your queries/answers/opinions in question window. It prevents ppl from analysing the question. The whole purpose of GMAT Club forum goes wasted by doing so.
Board of Directors
Joined: 17 Jul 2014
Posts: 2146
Own Kudos [?]: 1189 [1]
Given Kudos: 236
Location: United States (IL)
Concentration: Finance, Economics
GMAT 1: 650 Q49 V30
GPA: 3.92
WE:General Management (Transportation)
Send PM
Re: There is substantial evidence that certain forms of solar energy eithe [#permalink]
1
Bookmarks
rohitgoel15 wrote:
There is substantial evidence that certain forms of solar energy either now or within a few years will be economically competitive with conventional sources of heat and power.


let's analyze the question:
there is evidence
certain forms of SE will be economically competitive.
when will be? either now, or within a few years.

Error analysis:
although in A both "now" and "within few years" looks parallel, the verb that comes after that does not make sense with both entities.
SE now will be economically competitive...
if we are talking about the present, then why do we not use present simple? Moreover, now or within looks to me incorrectly placed.

(A) either now or within a few years will be economically competitive with conventional sources of heat and power
as mentioned above.

(B) will either be economically competitive with conventional sources of heat and power within a few years or are so now
the verb before "either" is "will". the second entity of the idiom either x or y doesn't make sense with the verb. thus incorrect.

(C) will be economically competitive with conventional sources of heat and power either now or within a few years
again, same mistake. will be now...nope.

(D) either are now economically competitive with conventional sources of heat and power or will be so within a few years
either are or will be - looks ok. worded ok, looks like we have a winner.

(E) are either now or will be within a few years economically competitive with conventional sources of heat and power
the same mistake as in B. the main verb is "are", then we have another verb "will be", are will be? nope!

D is the winner.
avatar
Intern
Intern
Joined: 19 Oct 2018
Posts: 48
Own Kudos [?]: 7 [0]
Given Kudos: 0
GMAT 1: 730 Q49 V41
Send PM
Re: There is substantial evidence that certain forms of solar energy eithe [#permalink]
B changes the meaning, suggesting that the alternative resources will be economically competitive or may not be. Is too confusing
A combines the present and future tenses, not correct.
C does the same
E is too wordy

D is the correct option
GMAT Club Bot
Re: There is substantial evidence that certain forms of solar energy eithe [#permalink]
Moderators:
GMAT Club Verbal Expert
6979 posts
GMAT Club Verbal Expert
236 posts