Question

我不明白为什么定语从句中会有from where 这个形式

Answer 1

【答】之所以会有from where这个形式主要是from的特殊用法——其实不光定语从句中有,在我们很常见的句子中也有这个用法：
from这个介词比较特殊,其后可以再加上一个介词短语.如：
from under the table 从桌子底下
from behind the door 从门后面看这道题：
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
【分析】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 from where.
类似的用法还有很多：
划线部分相当于…, and from at the windows…不可变为from which…,直接用where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.
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你这个理解是不对的：千万不要把where等同于in which
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