求教OG 13 SC 65，不是Ving的问题。而是than的问题。谢谢！

raylu1987

Digging in sediments in northern China, evidence has been gathered by scientists suggesting that complex life-forms emerged much earlier than they had previously thought.

原题的答案是
C scientists have gathered evidence suggesting that complex life-forms emerged much earlier than

我的疑惑是，than后面是previously thought，和前面所比较的complex life-forms emerged不是同类啊。是否可以理解成为因为previously thought也是scientists，所以省略了主语？

但是我最大的疑惑在D选项：
D scientists have gathered evidence that suggests a much earlier emergence of complex life-forms than that which was

OG上给出的错误原因是：
1、emergence这里用名词不如动词。why？
2、suggests a much earlier emergence 不清楚。How？
3、that which 插在previously thought前，“not only redundant but incorrect English”。
怎么就incorrect了呢？我的理解是that指代出现的时间，which引导定语从句。不行吗？

请N人们解惑！谢谢！

raylu1987

呃。。。没有高人可以解答一下吗？……

lifeforest

借你的问题，OG解释C说了“It also uses a parallel active form of the verb emerge..." 这里的parallel active 是跟谁parallel??

icewaterkira

先试着回答你第一个问题：个人感觉在这里的情况是比较结构的状语比较，是时间状语的相互比较，在状语比较的过程中可以省略主谓结构，省略的前提是than后面的时间状语结构必须在前文中已经出现过，虽然形式上不一定相同，但是状语所表达的含义具有一定的可比性。og13 42
42. To develop more accurate population forecasts, demographerswould have to know a great deal more than they do now about the social and economical determinants of fertility.
这个题目中由于than前面没有时间状语跟now相对应，所以后面要补出they do。
1.建议lz先看一下manhattan的sc改错第五版，在论坛里面有下载的。
在concision里面第11章中有提到，在使用的过程中：verb>adj>n
2.suggests a much earlier emergence的这种表达方法不如c选项中利用从句的表达更加清楚。
3.that which 插在previously thought前这种用法在og里面我就没见过对的时候。。。明显不对，好像就没有过这种用法。举个例子：that和which都是引导从句的，比如用which引导定语从句，前面就要有相应的名词，这样which前面是that是错误的用法。这个结构错误点还有很多。

icewaterkira

我感觉在这里emerged在这里只能跟than后面的thought平行了。因为首先emerge在that引导的从句当中，肯定不可能跟主句的动词gather平行，所以只能跟thought平行了。

li3360065

同一种东西 只要是时间上的区别 就可以省略主谓什么的。当心陷阱 比如说 in 1900 than 1991 ，缺少个 in 。

xueluanfei

先试着回答你第一个问题：个人感觉在这里的情况是比较结构的状语比较，是时间状语的相互比较，在状语比较的过程中可以省略主谓结构，省略的前提是than后面的时间状语结构必须在前文中已经出现过，虽然形式上不一定相同，但是状语所表达的含义具有一定的可比性。og13 42
42. To develop more accurate population forecasts, demographerswould have to know a great deal more than they do now about the social and economicaldeterminants of fertility.
这个题目中由于than前面没有时间状语跟now相对应，所以后面要补出they do。
1.建议lz先看一下manhattan的sc改错第五版，在论坛里面有下载的。
在concision里面第11章中有提到，在使用的过程中：verb>adj>n
2.suggests a much earlier emergence的这种表达方法不如c选项中利用从句的表达更加清楚。
3.that which 插在previously thought前这种用法在og里面我就没见过对的时候。。。明显不对，好像就没有过这种用法。举个例子：that和which都是引导从句的，比如用which引导定语从句，前面就要有相应的名词，这样which前面是that是错误的用法。这个结构错误点还有很多。

-- by 会员 icewaterkira (2013/1/1 12:00:38)

看了这个解释还是觉得不大明白。。继续求教。。。
1.原题正确选项带入是：Digging in sediments in northern China,  scientists have gathered evidence suggesting that complex life-forms emerged much earlier than previously thought.
这里如果是在比较时间状语，那所比较的时间状语是什么呢？并没有出现now...when...这种时间状语的词啊。。。难道是earlier? earlier不是形容词么。。
另外还疑惑previously tought，这个tought由于被副词previously修饰，应该是个动词。。如果后面补出了动词。。感觉是在比较动词，，但是前面又找不到可以跟thought比较的东东。。。求助求助

2. To develop more accurate population forecasts, demographerswould have to know a great deal more than they do now about the social and economical determinants of fertility.
这句话感觉是在比较名词的样子。。补出来是：
demographerswould have to know a great deal（n.所比较的名词，表示knowledge之类的东东） more than （the knowledge )they do now about the social and economical determinants of fertility.
感觉是在比较a great deal (knowledege) 和后面被省略的名词（knowledge)..因为这个名词已经很清楚了，所以就省略了，只是补出了动词表示前面的虚拟语态和后面的现在时 在时态上的差别。
感觉理解的很纠结啊，，请一针见血的指出错误。。。

yiqing2012

看了这个解释还是觉得不大明白。。继续求教。。。
1.原题正确选项带入是：Digging in sediments in northern China,  scientists have gathered evidence suggesting that complex life-forms emerged much earlier than previously thought.
这里如果是在比较时间状语，那所比较的时间状语是什么呢？并没有出现now...when...这种时间状语的词啊。。。难道是earlier? earlier不是形容词么。。
另外还疑惑previously tought，这个tought由于被副词previously修饰，应该是个动词。。如果后面补出了动词。。感觉是在比较动词，，但是前面又找不到可以跟thought比较的东东。。。求助求助

2. To develop more accurate population forecasts, demographerswould have to know a great deal more than they do now about the social and economical determinants of fertility.
这句话感觉是在比较名词的样子。。补出来是：
demographerswould have to know a great deal（n.所比较的名词，表示knowledge之类的东东） more than （the knowledge )they do now about the social and economical determinants of fertility.
感觉是在比较a great deal (knowledege) 和后面被省略的名词（knowledge)..因为这个名词已经很清楚了，所以就省略了，只是补出了动词表示前面的虚拟语态和后面的现在时 在时态上的差别。
感觉理解的很纠结啊，，请一针见血的指出错误。。。

-- by 会员 xueluanfei (2013/1/19 11:15:52)

先谈谈对previously thought的看法，除了than previously thought,类似的还有than usual/ ever before/ previously expected/previously estimated/ anticipated…等

等。很多人对这种比较提出过补充，有的补充为what was thought,有的补充为it/they was/were thought,总的来说学术界的定论并不明显（我查过有关的论文资料，中间提出过一些很专业的知识，反正我是没有看懂。。。），总之可见这种比较不同于其他，是一种很特殊的比较，所以不能按平常看待比较的方法来看这类比较。（之前看过几个大神的比较，bat的总结里也把它归为一类很特殊的比较：觉得bat对比较总结的非常好，你可以看看，在附件里，我记得好像有一处的理解有点错误，不太记得是那个地方了，但是应该不影响做题）
对于第二个句子，我个人觉得你补充错了，它比较的是句子或者说是时间，如果完整的话是：demographers would have to know a great deal more than they know(do) nowabout the social and economical determinants of fertility.其中 would 暗含了时间，所以不用完全点明，和now形成对比（这点bat总结里也提到了~）

yiqing2012

Digging in sediments in northern China, evidence has been gathered by scientists suggesting that complex life-forms emerged much earlier than they had previously thought.

原题的答案是
C scientists have gathered evidence suggesting that complex life-forms emerged much earlier than

我的疑惑是，than后面是previously thought，和前面所比较的complex life-forms emerged不是同类啊。是否可以理解成为因为previously thought也是scientists，所以省略了主语？

但是我最大的疑惑在D选项：
D scientists have gathered evidence that suggests a much earlier emergence of complex life-forms than that which was

OG上给出的错误原因是：
1、emergence这里用名词不如动词。why？
2、suggests a much earlier emergence 不清楚。How？
3、that which 插在previously thought前，“not only redundant but incorrect English”。
怎么就incorrect了呢？我的理解是that指代出现的时间，which引导定语从句。不行吗？

请N人们解惑！谢谢！

-- by 会员 raylu1987 (2012/12/15 18:35:48)

我之前问过XDF老师，他的解答是which前面要加逗号，但是个人觉得这不是最大的原因，因为gmat没有完全否定which做限制定从，而且按这个说法OG对E的解答也说不通。我看了ron对that指代的看法：if you're going to use "that" to REPLACE a noun, then it needs to be followed by a MODIFIER, not a “subject + verb”.
e.g.
the population of argentina is more than ten times that of uruguay.
--> correct.here, "that" actually REPLACES "population" (which is omitted from that second construction as a result). appropriately, it's followed by “of uruguay”, a prepositional phrase modifier.
The total money i have is twice that you have.
incorrect -- this "that" is not a relative pronoun such as the one above.

觉得第二句其实和本句话有点类似，因为把第二句改一下就是twice that which you have.
但是我并不肯定，open to discussion~~

xueluanfei

看了这个解释还是觉得不大明白。。继续求教。。。
1.原题正确选项带入是：Digging in sediments in northern China,  scientists have gathered evidence suggesting that complex life-forms emerged much earlier than previously thought.
这里如果是在比较时间状语，那所比较的时间状语是什么呢？并没有出现now...when...这种时间状语的词啊。。。难道是earlier? earlier不是形容词么。。
另外还疑惑previously tought，这个tought由于被副词previously修饰，应该是个动词。。如果后面补出了动词。。感觉是在比较动词，，但是前面又找不到可以跟thought比较的东东。。。求助求助

2. To develop more accurate population forecasts, demographerswould have to know a great deal more than they do now about the social and economical determinants of fertility.
这句话感觉是在比较名词的样子。。补出来是：
demographerswould have to know a great deal（n.所比较的名词，表示knowledge之类的东东） more than （the knowledge )they do now about the social and economical determinants of fertility.
感觉是在比较a great deal (knowledege) 和后面被省略的名词（knowledge)..因为这个名词已经很清楚了，所以就省略了，只是补出了动词表示前面的虚拟语态和后面的现在时 在时态上的差别。
感觉理解的很纠结啊，，请一针见血的指出错误。。。

-- by 会员 xueluanfei (2013/1/19 11:15:52)

先谈谈对previously thought的看法，除了than previously thought,类似的还有than usual/ ever before/ previously expected/previously estimated/ anticipated…等

等。很多人对这种比较提出过补充，有的补充为what was thought,有的补充为it/they was/were thought,总的来说学术界的定论并不明显（我查过有关的论文资料，中间提出过一些很专业的知识，反正我是没有看懂。。。），总之可见这种比较不同于其他，是一种很特殊的比较，所以不能按平常看待比较的方法来看这类比较。（之前看过几个大神的比较，bat的总结里也把它归为一类很特殊的比较：觉得bat对比较总结的非常好，你可以看看，在附件里，我记得好像有一处的理解有点错误，不太记得是那个地方了，但是应该不影响做题）
对于第二个句子，我个人觉得你补充错了，它比较的是句子或者说是时间，如果完整的话是：demographers would have to know a great deal more than they know(do) nowabout the social and economical determinants of fertility.其中 would 暗含了时间，所以不用完全点明，和now形成对比（这点bat总结里也提到了~）

-- by 会员 yiqing2012 (2013/1/19 12:33:18)

牛人。同意第一点，今天看千行也看到bat关于这个类型的总结了！
第二点保留意见，大家快来各抒己见，我先去把你推荐的文档看了再回来！谢谢帮忙！