介词+关系副词引导的定语从句
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介词+关系副词引导的定从句
定语从句中介词+关系副词的判断一般要在结构和意义上进行判断，二者缺一不可！
1. 介词+ 关系副词在意义上表示，从...的角度看；自从...时候起。以下第一组句子在意思上不具备这样的意思。
2. 介词+ 关系副词在形式上先行词必须是介词+ 时间/地点的一个状语都是一个介词短语。研究一下第二组句子的先行词形式。when/where 通常代指的是介词短语。
注意：since后只能用where, 而不能用which 因为根据以上原则，副词应代指的是一个状语，而不是一个名词。
I'll never forget the time when we worked on the farm.
Do you remember the afternoon when we first met three years ago?
The hotel where we stayed wasn't very clean.
I'd like to live in a hou where there is plenty
We went up to the roof of the temple, from where we had a good view of the procession.
They stood near the north window, from where they could e the whole garden.
Look over there! Some people are standing under the tree on the hill, from there you can enjoy the whole view.
That was in 1949, since when things have been better.
They left in Monday, since when we have heard nothing.
I went to bed at ten, before when I was reading for an hour.
Next summer, by when the hou should be ready.
1. He was blown off cour and found himlf in an unkown land, from where he eventual
ly reached Greenland.
2. He stood under the tree, from where he could e his son swimming.
3. You can go across the river, from where you can take a boat.
4. The book was written in 1946, ___ the education system has witnesd great changes.（07山东）
A. when
B. during which
C. since then
D. since when
