请教Prep2－56， 关于分词短语的疑问

songlovegt

再来看看这个题

In the past several years, astronomers have detected more than 80 massive planets, most of them as large or larger than Jupiter, which circle other stars.

(A) most of them as large or larger than Jupiter, which circle

(B) most of them as large or larger than Jupiter and circling

(C) most of them at least as large as Jupiter, circling

(D) mostly at least as large as Jupiter, which circle

(E) mostly as large or larger than Jupiter, circling

答案是C

most of them at least as large as Jupiter, 为插入成分可以去掉，

In the past several years, astronomers have detected more than 80 massive planets, most of them at least as large as Jupiter, circling other stars.

这里分词为非限定性修饰。如果是限定性修饰，那么说明还探测到一些massive planets不 circling other stars，这就不和逻辑了；而且去掉这个分词成分，不影响句子理解

这样看现在分词作定语可以有逗号隔开，表示非限定性修饰。

在回到这个题

native North American grasses develop an extensive root system, allowing for greater enrichment of the soil

为什么分词不能考虑是非限定性修饰呢？而且去掉也不影响理解。

songlovegt

再来看看这个题

In the past several years, astronomers have detected more than 80 massive planets, most of them as large or larger than Jupiter, which circle other stars.

(A) most of them as large or larger than Jupiter, which circle

(B) most of them as large or larger than Jupiter and circling

(C) most of them at least as large as Jupiter, circling

(D) mostly at least as large as Jupiter, which circle

(E) mostly as large or larger than Jupiter, circling

答案是C

most of them at least as large as Jupiter, 为插入成分可以去掉，

In the past several years, astronomers have detected more than 80 massive planets, most of them at least as large as Jupiter, circling other stars.

这里分词为非限定性修饰。如果是限定性修饰，那么说明还探测到一些massive planets不 circling other stars，这就不和逻辑了；而且去掉这个分词成分，不影响句子理解

这样看现在分词作定语可以有逗号隔开，表示非限定性修饰。

在回到这个题

native North American grasses develop an extensive root system, allowing for greater enrichment of the soil

为什么分词不能考虑是非限定性修饰呢？而且去掉也不影响理解。

alohabrian

以下是引用songlovegt在2009-3-3 21:33:00的发言：
我赞成 allowing 是作状语的，作定语没有必要加逗号。
分词比从句简洁，现在分词作定语也常见啊，不一定改为从句。
现在分词前面无逗号，分词可做状语或定语。是不是现在分词前面有逗号就一定作状语了呢？

我觉得也不一定，比如

prep-188.      (26379-!-item-!-188;#058&001961)

Neuroscientists, having amassed a wealth of knowledge over the past twenty years about the brain and its development from birth to adulthood, are now drawing solid conclusions about how the human brain grows and how babies acquire language.

A. Neuroscientists, having amassed a wealth of knowledge over the past twenty years about the brain and its development from birth to adulthood, are

B. Neuroscientists, having amassed a wealth of knowledge about the brain and its development from birth to adulthood over the past twenty years, and are

C. Neuroscientists amassing a wealth of knowledge about the brain and its development from birth to adulthood over the past twenty years, and are

D. Neuroscientists have amassed a wealth of knowledge over the past twenty years about the brain and its development from birth to adulthood,

E. Neuroscientists have amassed, over the past twenty years, a wealth of knowledge about the brain and its development from birth to adulthood,

很难说清是做 定语 还是 状语。这和",doing”的位置有关。如果是句末，我觉得是优先做“状语”。

[此贴子已经被作者于2009-3-3 21:52:21编辑过]

cuishang11

其实我感觉并不是优先不优先的问题  作状语也好作定语也好  关键是逻辑意思是否合理 

graceguo98

以下是引用wo11111111在2008-9-24 3:42:00的发言：

56.       (27418-!-item-!-188;#058&003510) 考点：比较，逻辑表达

Unlike crested wheatgrass, an alien species from Siberia that forms only shallow roots and produces tall above-ground shoots, native North American grasses develop an extensive root system, allowing for greater enrichment of the soil, but do not grow to be very tall.

(A) native North American grasses develop an extensive root system, allowing for greater enrichment of the soil, but do not grow to be very

(B) native North American grasses develop an extensive root system, which allows for their greater enrichment of the soil, but without growing to be that

(C) the root system of native North American grasses is extensive, allowing for greater enrichment of the soil, but they do not grow to be very

(D) the root system of native North American grasses is more extensive, allowing for the greater enrichment of the soil, but these grasses do not grow to be very

(E) the extensiveness of the root system of native North American grasses allows for their greater enrichment of the soil, but they do not grow to be that

 

but do not grow to be very tall.

我的问题， but 后面只能接完整句子吗？这but后面没有主语？难道but后面可以省略主语吗？

but什么情况下省略主语？while 还有哪些连词可以省略主语呢？

谢谢

vivian0331

同问

天蝎座1107

native North American grasses develop an extensive root system, allowing for greater enrichment of the soil, but do not grow to be very, allowing for greater enrichment of the soil, but do not grow to be very

期中allowing for是结果状语 逻辑助于是native North American grasses develop an extensive root system这整个事情 是native NA grasses develop了这样一个extensive root system这件事情allowing for...而不是NA grasses allowing for

OG11上有两处类似的例子 ...bringing...

ing在句尾有两种作用 结果状语和伴随状语 结果状语的逻辑主语是前面整个一件事情 伴随状语是的逻辑主语是句子主语 如果是后置定语就不会用逗号分开而直接跟在修饰名词的后面

zhengjingzhe

In the past several years, astronomers have detected more than 80 massive planets, most of them as large or larger than Jupiter, which circle other stars.

(A) most of them as large or larger than Jupiter, which circle

(B) most of them as large or larger than Jupiter and circling

(C) most of them at least as large as Jupiter, circling

(D) mostly at least as large as Jupiter, which circle

(E) mostly as large or larger than Jupiter, circling

天蝎MM可是像这题，选C，circling。。。后面是做定语修饰Jupiter的，也是用逗号隔开的。

还是觉得原题中allowing...既可做状语又可做定语，请大家继续来讨论下。

jupiter410

up

QXDsea

以下是引用zhengjingzhe在2009/7/24 20:17:00的发言：

In the past several years, astronomers have detected more than 80 massive planets, most of them as large or larger than Jupiter, which circle other stars.

(A) most of them as large or larger than Jupiter, which circle

(B) most of them as large or larger than Jupiter and circling

(C) most of them at least as large as Jupiter, circling

(D) mostly at least as large as Jupiter, which circle

(E) mostly as large or larger than Jupiter, circling

天蝎MM可是像这题，选C，circling。。。后面是做定语修饰Jupiter的，也是用逗号隔开的。

还是觉得原题中allowing...既可做状语又可做定语，请大家继续来讨论下。

这里circling是修饰planets，可以理解为一对逗号只是用来隔开插入语

查了一下Manhattan，对于allowing上面讲现在分词前有逗号，就是用来做副词性质的修饰语修饰前面的句子，跟笔记里说的分两种情况不大一样，

等过两天总结一下这类题，看看到底是怎么回事～