PREP-2007 sc2-49我真地是糊涂了，恳请牛牛指导下，感谢感谢！

laiweizhou

PREP-2007 sc2-49
Since 1990 the global economy has grown more than it did during the 10,000 years from the
beginning of agriculture to 1950.
(A) Since 1990 the global economy has grown more than it did during the 10,000 years from the
beginning of agriculture
(B) Since 1990 the growth of the global economy has been more than that during 10,000 years,
from when agriculture began
(C) The growth of the global economy since 1990 exceeds that which had been for 10,000 years
from the beginning of agriculture
(D) The growth of the global economy since 1990 exceeds what it has been for 10,000 years, from
when agriculture began
(E) The growth of the global economy since 1990 exceeds what it did for the 10,000 years from the
beginning of agriculture
做该题的时候，我一下子把A排除了，最后随便选了个答案。注：PREP解释中正确答案为A
我当时排除A的理由是， more than it did  需要改为 more than it grew。如果要用did 必须在前面的时态中找到对应的时态动词grew

1.在分析该题得时候，我查找了下以前的OG比较句子：
According to a recent poll, owning and living in a freestanding house on its own land is still a goal of a
majority of young adults,as it wasof earlier generations

2.而在manhattan关于省略中的解释如下
1.    I have never <seen>  such an animal, but last year my father did. 该句是错句
这里为什么不能用did?. 因为did不能跟前面出现的词seen.
2.    I have never <seen>  such an animal, but last year my father saw one.   该句才是正确的句子

总结，是不是只有并列句中才需要后面的助动词要在前面的句子中找到对应的同时态的动词，如果时态不同，则必须重复该时态的对应动词，而在比较（比较好像也是并列句的一种）的时候，可以用不同时态的助动词，即使前面的动词的时态不对应。恳请牛牛指导下，感谢感谢！



看了PREP-2007 sc2-63解释后 又否定了总结

Compared to those who do not, running three days a week saves an average of 14.1 percent on health-care costs each year in the United States. 正确答案为B

(A) Compared to those who do not, running three days a week saves

(B) Compared with nonrunners, people who run three days a week save

(C) Compared to not running, those running for three days a week save

(D) When compared with those who do not, people running three days a week save

(E) When compared to nonrunners, running three days a week saves

在prep解释D错误的理由是. do not没有可指代的动作,因为后面是用现在分词running作定语,而不是people who run…。

我真地是糊涂了，恳请牛牛指导下，感谢感谢！

laiweizhou

这是在额之前帖子上编辑的，原来的帖子在单位没有发成功，不好意思额。 我先顶顶

laiweizhou

大家如果有时间的话帮忙看看啊

张小心

我表示也一头雾水，帮顶，等牛出现。

laiweizhou

今天看了下这个帖子，有点眉目了，不知道理解的对不，大家看看

第一类：当比较的主语相同的时候，助动词的时态可以不一致。只需要和逻辑上的时态一致就可以了。
PREP-2007 sc2-49Since 1990 the global economy has grown more than itdid during the 10,000 years from thebeginning of agriculture to 1950.（逻辑时态根据后面的时间状语判断）

OG1282 According to a recent poll, owning and living in a freestanding house on its own land is still a goal of a majority of young adults, as itwas of earlier generations（逻辑时态根据earlier generations判断）


第二类：当比较的主语不相同的时候，如果使用助动词，则一定要在相关的句子中找到对应的助动词所代表的同时态的动词。如果时态不一致，则只能使用该动词合适的时态来表达
OG1222 None of the attempts to specify the causes of crime explains why most of the people exposed to the alleged causes do not commit crimes and, conversely, why so many of those not so exposed do.(注意这里的两个why 的主语是不一致的，一般来讲those, that指代的只是new copy, 和original 名词是不同的。 do代表的是前面的commit，所以该句是正确的)
Manhattan上的例题：I have never <seen>  such an animal, but last year my fathersawone（主语不相同，时态又不同，所以就不能用助动词did啦）

反例：PREP-2007 sc2-63解释后When compared with those whodo not, people running three days a week savean average of 14.1 percent on health-care costs each year in the United States

主语不同，do 必须要在后面找到他代表同时态动词run.但本句找不到，所以是错句。

其实这些相当于初中学到的语法：I work hard, so does my sister.(只不过这里是倒装)



第三类：特例
特征：主语相同，但后面的助动词想要强调的是不定式引导的目的动作达到的状态。（即可以肯定也可以否定）。另外前面的句子经常是被动。（由于是被动，我们是否可以认为前后的主语不相同？）
处理方式。可以参考第二类的处理方式。必须要在句子中的其它地方找到助动词所代表的逻辑意义上的同时态动词
Manhattan上的解释In the rare cases in which the tenses do not need to match, the exact verb form missing afterthe helping verb should be present elsewhere in the sentence.
OG1287 In an effort to reduce their inventories, Italian vintners have cut prices; their wines are priced to sell, and theydo（do 代表的是sell）
Manhattan上的例题：Our cars were designed to inspire envy, and theydo.（do 代表的是inspire）

酱子啊

[quote]
今天看了下这个帖子，有点眉目了，不知道理解的对不，大家看看

第一类：当比较的主语相同的时候，助动词的时态可以不一致。只需要和逻辑上的时态一致就可以了。
PREP-2007 sc2-49Since 1990 the global economy has grown more than itdid during the 10,000 years from thebeginning of agriculture to 1950.（逻辑时态根据后面的时间状语判断）

OG1282 According to a recent poll, owning and living in a freestanding house on its own land is still a goal of a majority of young adults, as itwas of earlier generations（逻辑时态根据earlier generations判断）


第二类：当比较的主语不相同的时候，如果使用助动词，则一定要在相关的句子中找到对应的助动词所代表的同时态的动词。如果时态不一致，则只能使用该动词合适的时态来表达
OG1222 None of the attempts to specify the causes of crime explains why most of the people exposed to the alleged causes do not commit crimes and, conversely, why so many of those not so exposed do.(注意这里的两个why 的主语是不一致的，一般来讲those, that指代的只是new copy, 和original 名词是不同的。 do代表的是前面的commit，所以该句是正确的)
Manhattan上的例题：I have never <seen>  such an animal, but last year my fathersawone（主语不相同，时态又不同，所以就不能用助动词did啦）

反例：PREP-2007 sc2-63解释后When compared with those whodo not, people running three days a week savean average of 14.1 percent on health-care costs each year in the United States

主语不同，do 必须要在后面找到他代表同时态动词run.但本句找不到，所以是错句。

其实这些相当于初中学到的语法：I work hard, so does my sister.(只不过这里是倒装)



第三类：特例
特征：主语相同，但后面的助动词想要强调的是不定式引导的目的动作达到的状态。（即可以肯定也可以否定）。另外前面的句子经常是被动。（由于是被动，我们是否可以认为前后的主语不相同？）
处理方式。可以参考第二类的处理方式。必须要在句子中的其它地方找到助动词所代表的逻辑意义上的同时态动词
Manhattan上的解释In the rare cases in which the tenses do not need to match, the exact verb form missing afterthe helping verb should be present elsewhere in the sentence.
OG1287 In an effort to reduce their inventories, Italian vintners have cut prices; their wines are priced to sell, and theydo（do 代表的是sell）
Manhattan上的例题：Our cars were designed to inspire envy, and theydo.（do 代表的是inspire）

-- by 会员 laiweizhou (2011/10/26 22:26:56)

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MiaZhang

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厝暮晴

顶一个.