prep1-97 及关于状语从句省略的疑问

TODD_XIE

Industrialization and modern methods of insect control have improved the standard of living around the globe while at the same time they have introduced some 100,000 dangerous chemical pollutants, having gone virtually unregulated since they were developed more than 50 years ago.

 

(A) while at the same time they have introduced some 100,000 dangerous chemical pollutants, having

(B) while at the same time introducing some 100,000 dangerous chemical pollutants that have

(C) while they have introduced some 100,000 dangerous chemical pollutants at the same time, which have

(D) but introducing some 100,000 dangerous chemical pollutants at the same time that have

(E) but at the same time introducing some 100,000 dangerous chemical pollutants, having

答案B

我知道是因为如果引入they会导致,前后2个的指代不清,还有在这里限制性定语从句比非限制性好,所以选B

 

但是却引起了我关于状语从句省略的疑问

 

有种说法是当状从的主语和主句主语相同,且谓语动词是be 时,可以将从句的主语和be同时省略. 如 When (i was) young, I liked swimming.

 

那这里的b选项是不是就是

Industrialization and modern methods of insect control have improved the standard of living around the globe while at the same time (I and m methods of insect control was) introducing some 100,000 dangerous chemical pollutants that have gone virtually unregulated since they were developed more than 50 years ago.

那从句不是用的进行时了么,但是at the same time 指的是过去的特定时间,是不是应该用一般过去时呢?

如果用一般过去时

while somebody did something 能省略成 while doing something吗

哪位战友能给个想法呀...谢谢哦

 

 

TODD_XIE

我顶...帮忙各位....

ad264

既然是at the same time应该是
Industrialization and modern methods of insect control have introdued ....

能改成分词的时态是相同的，只要去区分这个动词是主动或被动判断ing或ed即可

TODD_XIE

以下是引用ad264在2008-6-12 22:22:00的发言：
既然是at the same time应该是
Industrialization and modern methods of insect control have introdued ....

能改成分词的时态是相同的，只要去区分这个动词是主动或被动判断ing或ed即可

谢谢

那是不是只要主从时态一致 就可以将从句改成分词吗

TODD_XIE

求助求助....

ad264

這是原則，但是一句话能不能改分词有很多考虑因素。
在OG中，有and的句意，有that的句意，表示重要者，都不要改分词比较好，因为他是属於relevent but not important info.

ad264

    

另外这一题有一个句型可以注意 while + ving是偶尔可以看到的句子。

    
        
                
                
            
            
                
                
            
            
                
                
            
            
                
                
            
            
                
                
            
            
                
                
            
            
                
                
            
            
                
                
            
        

	A recent poll indicates that many   people in the United States   hold a combination of conservative and liberal political views; i.e., they denounce   big government, saying government is doing too much and has become too powerful,   while at the same time                             supporting many specific government programs for health   car, education, and environment.
	A   South American bird that forages for winged termites and other small insects while swinging   upside down form the foliage of tall trees, the graveteiro belongs to the   ovenbird family, a group of New World   tropical birds that includes more than 230 species and is represented in   virtually every kind of habitat.
Y134	Recently implemented "shift-work   equations" based on studies of the human sleep cycle have reduced sickness,   sleeping on the job, and fatigue among shift workers while   raising production efficiency in various industries.
Y136	Joachim Raft and Giacomo Meyerbeer   are examples of the kind of composer who receives popular acclaim while living, but whose   reputation declines after death and never regains its former status.
旧OG	In   the last few years, the number of convicted criminals given community service   sentences allowing them to remain unconfined while performing specific jobs that benefit the public has   risen dramatically
	The   themes that Rita Dove explores in her poetry are universal, encompassing much   of the human condition while occasionally dealing with racial issues.
	A South American bird that forages for winged termites and   other small insects while swinging upside down form the foliage of tall trees,   the graveteiro belongs to the ovenbird family, a group of New World tropical birds   that includes more than 230 species and is represented in virtually every kind   of habitat.
	The principal feature of the redesigned   checks is a series of printed instructions that the company hopes will help merchants   confirm a check's authenticity, including reminders to watch the endorsement,   compare signatures, and view the watermark while holding the check to the light.

    

 

[此贴子已经被作者于2008-6-12 23:30:06编辑过]

TODD_XIE

不知 我这样理解对不对

A do something,

while he do something/ while he did something/ while he have done something/

都可以变成while doing something. 只要主从,主语一致

是不是这样呢?

ad264

    

要时态也一致才可以

        也就是说

        A作某事while作某事

        两个动作同一时态才可以将第二个动作改分词(Ving)←常出現的考題

            

        修正：如果分词的动作比主句还要早，就要用完成式形式的分词←考题很少

    

 

    

例句：

    

Having seen him before, I know him well.

    

Having locked the door, I went to sleep.

[此贴子已经被作者于2008-6-13 3:24:58编辑过]

ad264

不知道有没有解决你的疑问
你看我给的例子是不是所有分词都是长一样Ving，看不出任何时态，所以是一定要跟主句时态一样。因为一样就可以类推。

只要区分这个动作主词是主动作，还是被动，然後改ing或ed即可。