SC confusion: what are/is : GMAT Sentence Correction (SC)
Check GMAT Club Decision Tracker for the Latest School Decision Releases http://gmatclub.com/AppTrack

 It is currently 21 Jan 2017, 03:47

### 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

# Events & Promotions

###### Events & Promotions in June
Open Detailed Calendar

# SC confusion: what are/is

 new topic post reply Question banks Downloads My Bookmarks Reviews Important topics
Author Message
TAGS:

### Hide Tags

Manager
Joined: 02 Jul 2004
Posts: 218
Followers: 1

Kudos [?]: 8 [0], given: 0

SC confusion: what are/is [#permalink]

### Show Tags

02 Aug 2004, 04:14
00:00

Difficulty:

(N/A)

Question Stats:

0% (00:00) correct 0% (00:00) wrong based on 0 sessions

### HideShow timer Statistics

Can you please help me with this:

1. The work of mathematician Roger Penrose in the early 1970s, on the geometry of <WHAT ARE CALLED aperiodic tiles, turned out to describe> the architecture of a previously unknown class of crystals.
(correct A) what are called aperiodic tiles, turned out to describe

2. The period when the great painted caves at Lascaux and Altamira were occupied by Upper Paleolithic people <has been established by carbon-14 dating, but what is much more difficult to determine are> the reason for their decoration, the use to which primitive people put the caves, and the meaning of the magnificently depicted animals.
(A) has been established by carbon-14 dating, but what is much more difficult to determine are
(correct B) has been established by carbon-14 dating, but WHAT is much more difficult to determine IS

Here is an excerpt from OG explanation for the second question: â€œTwo instances of subject-verb agreement must be observed in this sentence: The PERIOD ... HAS been established and WHAT is much more difficult to determine ... IS. Both clauses have SINGULAR SUBJECTS and must have singular verbsâ€
If you have any questions
you can ask an expert
New!
Senior Manager
Joined: 06 Dec 2003
Posts: 366
Location: India
Followers: 1

Kudos [?]: 11 [0], given: 0

Re: SC confusion: what are/is [#permalink]

### Show Tags

02 Aug 2004, 04:59
Please consider the highlighted part of your text:

[quote="OlegC"]Can you please help me with this:

1. The work of mathematician Roger Penrose in the early 1970s, on the geometry of <WHAT ARE CALLED aperiodic tiles, turned out to describe> the architecture of a previously unknown class of crystals.
(correct A) what are called aperiodic tiles, turned out to describe

2. The period when the great painted caves at Lascaux and Altamira were occupied by Upper Paleolithic people <has been established by carbon-14 dating, but what is much more difficult to determine are> the reason for their decoration, the use to which primitive people put the caves, and the meaning of the magnificently depicted animals.
(A) has been established by carbon-14 dating, but what is much more difficult to determine are
(correct B) has been established by carbon-14 dating, but WHAT is much more difficult to determine IS

Here is an excerpt from OG explanation for the second question: â€œTwo instances of subject-verb agreement must be observed in this sentence: The PERIOD ... HAS been established and WHAT is much more difficult to determine ... IS. Both clauses have SINGULAR SUBJECTS and must have singular verbsâ€
_________________

Perseverance, Hard Work and self confidence

Manager
Joined: 28 Jul 2004
Posts: 179
Followers: 1

Kudos [?]: 15 [0], given: 0

### Show Tags

02 Aug 2004, 18:41
Easier way to handle this confusion is the introduce the invisible words.

In the first question, introduce the word 'objects' in between the word what and are. Since those tiles are some objects, its understood when we write it in this form.

In the second question, introduce the word 'reason' in between the word what and is. Obviously the sentence explains that we are unable to find the reason why those painting were made.

Correct me if i am wrong.
02 Aug 2004, 18:41
Similar topics Replies Last post
Similar
Topics:
SC-OG-13 -Verb confusion 2 30 Apr 2014, 08:16
1 MGMAT SC: Confusing Example 1 13 Jan 2010, 11:32
1 GMAT Prep SC - Confusing! 11 01 Sep 2009, 23:06
SC - Verb Tense Confusion 7 12 Mar 2009, 11:18
SC :confusing or tricky 18 24 Jun 2008, 22:48
Display posts from previous: Sort by

# SC confusion: what are/is

 new topic post reply Question banks Downloads My Bookmarks Reviews Important topics

 Powered by phpBB © phpBB Group and phpBB SEO Kindly note that the GMAT® test is a registered trademark of the Graduate Management Admission Council®, and this site has neither been reviewed nor endorsed by GMAC®.