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题库 / Prep2008E2-SC-166
The period when the great painted caves at Lascaux and Altamira were occupied by Upper Paleolithic peoples has been established by carbon dating, but what is much more difficult to determine are the use to which primitive peoples put the caves, the reason for their decoration, and the meaning of the magnificently depicted animals.
has been established by carbon dating, but what is much more difficult to determine are
have been established by carbon dating, but what is much more difficult to determine are
have been established by carbon dating, but that which is much more difficult to determine is
has been established by carbon dating, but what is much more difficult to determine is
are established by carbon dating, but that which is much more difficult to determine is
题目分析：
旧石器时代的人居住在位于Lascaux与Altamira的巨大的壁画洞的时期已经通过碳测时法确认，但更难确定的是原始人使用什么工具开凿石洞，为什么他们要装饰以及这些华丽的被描绘出的动物所代表的含义。
此处总结一下what从句做主语时，谓语动词的单复数情况：
当what在从句中充当主语时，主句谓语动词的单复数由what引导的主语从句中的谓语动词的单复数决定。例如：
(1) What is difficult to understand is A.
(2) What are difficult to understand are A and B.
当what在从句中充当宾语时，主句谓语动词的单复数由主句的表语/宾语决定。例如：
What his father left him are a few English books.
选项分析：
A选项：but后分句谓语动词应该用单数形式is，what is difficult的is决定主句谓语动词应该用单数is而不是are。
B选项：前半句主语The period和谓语动词have主谓不一致；but后半句主谓不一致错误同选项(A)。
C选项：前半句主谓不一致错误同选项(B)。
D选项：Correct. 本选项在语法和逻辑上均是正确的。
E选项：前半句主谓不一致错误同选项(B)。
不服我不服，三项内容，“he use to which primitive peoples put the caves, the reason for their decoration, and the meaning of the magnificently depicted animals.”怎可用 what is much more difficult to determine？？？怎么能用is？
又读了几遍，服了；原来what是主语
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（转）Point to discuss:
As per manhattanprep.c…-t7994-15.html
"what his father gave him are a few books."
Ron: "no, you would still write "is", because the subject of the verb is still what his father gave him, not a few books."
The subject here is “what is much more difficult to determine”
As per Manhattan SC guide this is called Sub Phrase and it is always singular.
替换：
当what引导名词性从句时，其所指的名词通常是单数，谓语动词也是单数。但有时因谓语动词之后有复数名词，谓语动词也可以用复数。
因为what指代那个东西，其是单数还是复数本身是不清楚的，所以通常指单数。而主宾单复数不一致时谓语动词跟主语走，所以即便宾语是复数，what引导的主语从句谓语动词也可以是单数。参考句子：The only thing my father left me was a few books=What my father left me was a few books. 这里也可以变成The things my father left me were a few books=What my father left me were a few books.
1.主谓一致，主语是单数，谓语也应该是单数BCE错。
2.前后一致，what is....is才对，前后单复数应该一致，AB错
3.简洁，CE的that which is错，没有这么用的，CE错。
what充当主语从句中的主语时，主句谓语与从句谓语保持一致
what is difficult to determine is A.
what are difficult to determine are A and B.
what充当主语从句中的宾语时，主句谓语与主句表语/宾语保持一致
what his father left him are a few English books.
主谓一致！！！what is much more difficult to determine，谓语动词还是用单数，不应该跟表语来定单复数
what is much more difficult to determine 【is】 the use to which primitive peoples put the caves, the reason for their decoration, and the meaning of the magnificently depicted animals
what is difficult的is决定主句谓语动词应该用单数is而不是are
"what his father gave him are a few books."
Ron: "no, you would still write "is", because the subject of the verb is still what his father gave him, not a few books."
The subject here is “what is much more difficult to determine”
As per Manhattan SC guide this is called Sub Phrase and it is always singular.
当what在从句中充当主语时，主句谓语动词的单复数由what引导的主语从句中的谓语动词的单复数决定。例如：
(1) What is difficult to understand is A.
(2) What are difficult to understand are A and B.
当what在从句中充当宾语时，主句谓语动词的单复数由主句的表语/宾语决定。例如：
What his father left him are a few English books.
No, that would still be "what is difficult to understand".
You shouldn't see anything starting with "what are...", unless it's a question. GMAT SC sentences are never questions, so the whole thing is a non-issue. (I.e., you'll never actually face this kind of thing as a decision point between answer choices, so there is no reason to worry about it.) by Ron
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what引导主语从句时，
What is much more difficult to determine is A and B and C. 正确
What are much more difficult to determine are A and B and C.正确
Wrong: What is much more difficult to determine are A and B and C.
you only have a backward construction (verb before subject) if NOTHING in FRONT of the verb is eligible to be the subject.
on the table are two cell phones
此处总结一下what从句做主语时，谓语动词的单复数情况：
当what在从句中充当主语时，主句谓语动词的单复数由what引导的主语从句中的谓语动词的单复数决定。例如：
(1) What is difficult to understand IS(看前面从句的谓语动词is) A.
(2) What are difficult to understand ARE（看前面从句的谓语动词are） A and B.
当what在从句中充当宾语时，主句谓语动词的单复数由主句的表语/宾语决定。例如：
What his father left him ARE(看主句宾语或者表语，即 a few books) a few English books.
what (is more difficult to determine暂且理解为修饰what的定语） IS the use, the reason, and the meaning.
主谓一致，不需要主表一致
当what在从句中充当主语时，主句谓语动词的单复数由what引导的主语从句中的谓语动词的单复数决定。例如：
(1) What is difficult to understand is A.
(2) What are difficult to understand are A and B.
主语period，排除BCE，what在从句中做主语，用is。选D
当what引导主语从句时，其所指的名词通常是单数，谓语动词一般是单数。但有时因谓语动词之后有复数名词，谓语动词也可以用复数。
E.G：
What is much more difficult to determine is A and B and C.
What are much more difficult to determine are A and B and C.
Wrong: What is much more difficult to determine are A and B and C.
当what引导宾语从句时，主句谓语动词的单复数由主句的表语/宾语决定。
E.G：What his father left him are a few English books.
(一) What/which/that
what引导从句形式的主语/宾语/表语/同位语，在句子里充当成分； that/which只能引导的定语从句，作修饰语而不是主句成分。What不充当修饰语，所以what不能引导定语从句中；that/which不能指代一件事，所以他们不能引导状语从句。
What/which/that从句的相似点是他们引导的都是一个句子，要求从句本身成分完整。
E.G：
What he said made me sad. what引导SVO的结构主语从句
The apple which he eat is mine. which引导SVO的定语从句。
（转）Point to discuss:
As per manhattanprep.c…-t7994-15.html
"what his father gave him are a few books."
Ron: "no, you would still write "is", because the subject of the verb is still what his father gave him, not a few books."
The subject here is “what is much more difficult to determine”
As per Manhattan SC guide this is called Sub Phrase and it is always singular.
主谓一致 关注主语 what is much more difficult to determine 是单数 不要被表语、宾语影响 除非谓语动词前没有主语
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