OG SC No. 126

薰衣紫草 · 发表于 2005-3-8 01:47:00

126. More than thirty years ago Dr. Barbara McClintock, the Nobel Prize winner, reported that genes can “jump,” as pearls moving mysteriously from one necklace to another.

(A) as pearls moving mysteriously from one necklace to another

(B) like pearls moving mysteriously from one necklace to another

(C) as pearls do that move mysteriously from one necklace to others

(D) like pearls do that move mysteriously from one necklace to others（B）

(E) as do pearls that move mysteriously from one necklace to some other one

After reviewing all the discussion links I can find, I still have some doubt regarding the explanation, from OG, why C, D, and E are faulty. OG explains that because the verb do suggests that the migrating pearls are presented as a real phenomenon, not as a figurative illustration.

But as stated in this summary, "补出助动词的原则是必须和主句的类型一致，而且要时态一致。

一个语法考点的总结！（Like和As）http://forum.chasedream.com/dispbbs.asp?BoardID=23&ID=48608

My point is that in the clause genes can “jump”, the verb is "can", not "do". Therefore, the verb "do" makes C, D, and E all wrong. It should be as peals can ......

NN, what do you think?

mitr_sg · 发表于 2005-3-8 04:00:00

well, personally, I think as you quoted " presented as a real phenomenon, not as a figurative illustration." "can" might leave problem unresolved. 修饰好象大多都是用...ing, D 读起来有些别扭.

薰衣紫草 · 发表于 2005-3-9 07:29:00

D 肯定是错的。因为 like 不能跟 clause

但问题是如果把 E 改成 as can pearls .... 是否就对了呢？

colacat · 发表于 2005-3-9 10:02:00

不对

首先 GMAT里,like 表比喻，意为象....一样。形式是like + n

in choice B like pearls moving mysteriously from one necklace to another

moving mysteriously from one necklace to another 做定语修饰的是pearls.

意为象.......一样的珍珠。从整句来说，就是把 Dr. BM的这个发现，比喻成珍珠。

薰衣紫草 · 发表于 2005-3-11 08:17:00

我承认 B 是对的

但 as 也可以作为比喻的一种方式，后面跟 clause

按照ETS的解释：because the verb do suggests that the migrating pearls are presented as a real phenomenon, not as a figurative illustration.

但问题是如果把 E 改成 as can pearls .... 是否就对了呢？

colacat · 发表于 2005-3-11 08:53:00

去掉that就没问题吧

uajasmine · 发表于 2005-3-11 10:42:00

As far as I am concerned, OG does not use the figurative function of "as", "as" is only used as a conjunction.

Further, even if you change "do" to "can", I do not think it is right, becuase pearls CAN NOT move mysteriously from one necklace to some other one.

Well, I don's think I am clear, sigh! Sorry for that!

xealot · 发表于 2005-3-11 10:54:00

偶以为：

1. 补出助动词的原则是必须和主句的类型一致，而且要时态一致。

偶认为这种说法不准确。时态是否一致应当取决于切实情况：
He is doing a fantastic work as did Gen. Robert E. Lee in the Civil War.
He did a fantatic work as did Gen. Robert E. Lee in the Civil War.
上面两种情况代表了的意思，但偶认为都没有错。

2. OG的意思是，pearl实际上没有这样运动，因此表示实意的do不合适

3.

但问题是如果把 E 改成 as can pearls .... 是否就对了呢？

也不对，pearls当然不can的...这可能是楼主MM理解的误区...

ford424 · 发表于 2005-3-11 13:27:00

省略规则:

在比较结构中，但谓语（内容）一致的时候，比较两个主语时，在比较词（than/as等)后，要尽量补出谓语动词，其原则为：

（1）当比较词之前的谓语动词为一般现在时或一般过去时，比较词后应该相应的用do/does/did/is/was/were/are来替代(主语对比, 有时候动词可以省略 eg. He gains more weight than Tom.)

（2）当比较词之前的谓语动词由助动词（情态动词）+主要动词组成，则在比较词之后保留此助动词（情态动词）即可；

（3）比较前后的时态不一致：两个比较对象的动作是相同的，但是其发生的时间却不一致

a.比较前是过去时，其后的时间状语暗示了将来的动作，补出助动词will

b.比较前是过去时，其后是过去完成时，补出had

c.比较前面是过去完成时，其后是过去时，谢全动词.

xealot · 发表于 2005-3-11 13:43:00

在比较结构中，但谓语（内容）一致的时候，比较两个主语时，在比较词（than/as等)后，要尽量补出谓语动词，其原则为：

（1）当比较词之前的谓语动词为一般现在时或一般过去时，比较词后应该相应的用do/does/did/is/was/were/are来替代(主语对比, 有时候动词可以省略 eg. He gains more weight than Tom.)

（2）当比较词之前的谓语动词由助动词（情态动词）+主要动词组成，则在比较词之后保留此助动词（情态动词）即可；

（3）比较前后的时态不一致：两个比较对象的动作是相同的，但是其发生的时间却不一致

a.比较前是过去时，其后的时间状语暗示了将来的动作，补出助动词will

b.比较前是过去时，其后是过去完成时，补出had

c.比较前面是过去完成时，其后是过去时，谢全动词.

So complex...
偶觉得比较时是否省略谓语动词（或其合理的助动词）主要靠意思判断，比如上面那个例子：

He gains more weight than Tom.

偶认为，在这里，Tom前面或者后面需要一个does，否则有两种理解，其中一种是：

He gains more weight than he gains Tom.

偶觉得而是否产生歧义的一个重要（而不是绝对/唯一）的表征是有几个可以用于比较的名词性结构：

He did better than Tom.

在这样一个例子里面，不存在任何曲解，因此省略Tom前/后的did就不成问题了。

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OG SC No. 126

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