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# The period when the great painted caves at Lascaux and Altamira were o

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Verbal Expert
Joined: 14 Dec 2013
Posts: 3201
Location: Germany
Schools: HHL Leipzig
GMAT 1: 780 Q50 V47
WE: Corporate Finance (Pharmaceuticals and Biotech)
Re: The period when the great painted caves at Lascaux and Altamira were o [#permalink]

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06 Mar 2017, 11:33
1
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Expert's post
PathFinder007 wrote:
Hi Experts,

Could you please provide your comments for subject-verb issue. what is the subject for second clause is it reason or the clause (What is much more difficult to determine)

Thanks

The subject is "what is much more difficult to determine", and therefore singular verb "is" is correct.
Manager
Joined: 17 Aug 2015
Posts: 119
GMAT 1: 650 Q49 V29
Re: The period when the great painted caves at Lascaux and Altamira were o [#permalink]

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21 Mar 2017, 19:49
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．

first sentence the subject is - period- verb has is correct

second clause starting with but- subject is - what is much more difficult to determine- the entire phrase so verb are is wrong as phrase is always singular
Manager
Joined: 26 Mar 2017
Posts: 146
Re: The period when the great painted caves at Lascaux and Altamira were o [#permalink]

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09 Jun 2017, 01:35
(A) has been established by carbon-14 dating，but what is much more difficult to determine are
(B) has been established by carbon-14 dating，but what is much more difficult to determine is
(C) have been established by carbon-14 dating，but what is much more difficult to determine is
(D) have been established by carbon-14 dating，but what is much more difficult to determine are
(E) are established by carbon-14 dating，but that which is much more difficult to determine is
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Re: The period when the great painted caves at Lascaux and Altamira were o   [#permalink] 09 Jun 2017, 01:35

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# The period when the great painted caves at Lascaux and Altamira were o

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