Question

from where引导的定语从句怎么解释

Answer 1

from where 引导的定语从句
1、Soon after getting off his horse,the captain appeared at the second storey windows,from where he could see nothing but trees.下马不久,上尉就出现在二楼的窗口了.他从那里除了树木什么也没看到.(引导定语从句)
划线部分相当于…,and from at the windows…不可变为from which…,可用where,但不如用from where更具体.
2、She climbed up to the top of the hill,from where she could have a good view of the whole town.她登上山顶,从那里她可以一览全城风光.（引导定语从句）
划线部分相当于…,and from on the top of the hill或from on the top of which…,不可变为from which,也可直接用where引导,但语义较为含糊,不如用from where更加生动、形象、具体.
3、We went up to the roof ,from where we had a good view of the procession.我们爬到屋顶,在那儿我们可以一览整个行进队伍.（引导定语从句）
划线部分可理解为and from on the top of the roof或from on the top of which,用from which是不对的,直接用where仍显不具体,不形象.
4、China is the birth place of kites,from where kiteflying spread to Japan,Korea,Thailand and India.中国是风筝的故乡,在那里风筝传到日本、朝鲜、泰国和印度.
这里from正与下文的spread to构成一个整体,可理解为from near/around this place,如若把from where换为where显然是讲不通的,改成from which,能够讲得通,但不太符合英语习惯.
5、The car stopped suddenly only a few inches from where I stood.那辆小汽车就在我站的地方仅几英寸处忽然停下了.（引导状语从句）这里的划线部分中where引导的是宾语从句,与from一起作地点状语从句.

Answer 2

定语从句的本质其实就是把并列句的and去掉，然后用相应的关系代词去替换人称代词、指示代词，用关系副词替换指示副词。
it，this，that，these, those---which/that
he, she, they, etc.---who
him, her, them, etc.---whom
his, her, thire, etc.---whose
here, there---where
now, then---when
以上问题句中之所以用from where而不用from which,是因为并列句中用的是from there/here, 而不是from this/that/it。道理其实很简单的。
定语从句的先行词不一定只是代词。还可以是名词，这里可以是from this place，而不是from this。

from this place就等于from here。改为从句时则为from which place.或from where

The fire lasted three hours, and during that time most things were destroyed.
The fire lasted three hours, during which time most things were destroyed.
这里介词(from)+关系副词(where)相当于from +地点状语，即关系副词相当于代替前面的一个介词短语，以便所表达地点更加具体，更加清晰准确。
A: from which 中的关系代词which只能代替”一个表示地点/事物的名词，不能代替一个介词短语，有时候无法准确表达一个确切地点状语。
B:from where 中的关系副词where能代替一个“表示确切地点的介词短语”因此能描述一个比较准确地点状语。这个比较准确地点状语是用来说明定语从句谓语动作发生的地点。（即某人在某地干了某事）

(备注，还可以把介词短语当作一个“there”的地点状语来理解，即from where=from there)

【1】Soon after getting off his horse, the captain appeared at the second storey windows, from where he could see nothing but trees.
=Soon after getting off his horse, the captain appeared at the second storey windows,and from at the second storey windows he could see nothing but trees.
下马不久，上尉就出现在二楼的窗口了。他从那里除了树木什么也没看到。(引导定语从句)

A: and from at the second storey windows.

【2】She climbed up to the top of the hill, from where she could have a good view of the whole town.(非限制性定语从句）
=She climbed up to the top of the hill, and from on the top of the hill she could have a good view of the whole town.（有连词and 连接并列句）
=She climbed up to the top of the hill, from on the top of which she could have a good view of the whole town.(非限制性定语从句）
她登上山顶，从那里她可以一览全城风光。（引导定语从句）
划线部分相当于
A:and from on the top of the hill
B:from on the top of which(which代替先行词the hill)

【3】He hid himself in a tree, from where he could see the enemy in the distance.
他躲在一棵树上，从那儿他可以看到远处的敌人。
【4】We went up to the roof, from where we had a good view of the procession.
爬上屋顶，从那儿可以很好地观看游行。
【5】He hid himself under the bed, from where he could hear what they were talking.
=He hid himself under the bed and from under the bed he could hear what they were talking.
他躲在床下面，他可以从床下听到他们谈话。
（解析：句中的 from where 可理解为 from under the bed，意思是“从床下面”,即在定语从句中关系副词where取代/代替了介词短语under the bed）
注意和下面第4个句子区别
【4】He hid himself under the bed,where he could hear what they were talking. 他躲在床下面，在床那儿他听到他们谈话。

（解析：句中的 where 可指为“在床边”“在床上”“在床下”等，意思不够。意思比较模糊）
为了让你有更好理解，现补充下面内容
特殊引导词“from where”引导定语从句
(1)Where are you from？
(2)Where do you come from?
from这个介词比较特殊，其后可以再加上一个介词短语。
A:from under the table 从桌子底下
B:from behind the door 从门后面
Look over there! some people are standing under the big tree,___ you can enjoy the whole view.
A.where B.from which C where D from where
【D答案解析】where 代表 under the tree 这个地方，如果用 which 就只能代表the big tree, 这句话的意思不是Enjoy the whole view from the big tree而是from under the big tree.所以只能用D fromwhere。
【最后总结】
当先行词为：介词+地点名词而不是单个地点名词作先行词时，定语从句需要使用引导词from where 来引导定语从句。
from the window,from the top of the hill感觉就是完整的了，

(1)from which=from +名词，相当于表达地点比较模糊，不够清楚，尤其是在描述一个准确地点状语时无法达到所需要确切要求。
(2)from where=from+介词短语表示从一个（确切且清楚地方）从而更加更加清楚，清晰，更具体描述定语从句谓语动作发生地点。