介词+关系副词引导的定语从句

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(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或when, 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。第一组:Ill never forget the time (先行词为名词)in which (which代替名词先行词the time)we worked on the farm. Do you remember the afternoon (先行词为名词)in which (which代替名词先行词the afternoon) we first met three years ago? The hotel (先行词为名词)in which (which代替名词先行词the hotel )we stayed wasnt very clean. Id like to live in a house (先行词为名词)in which (which代替名词先行词a house)there is a bathroom第二组:We went up to the roof of the temple, (先行词为介词短语)from where (where代替介词短语先行词to the roof of the temple)we had a good view of the procession.They stood near the north window,(先行词为介词短语) from where (where代替介词短语先行词 near the north window) they could see the whole garden.Look over there! Some people are standing under the tree on the hill,(先行词为介词短语)from where (where代替介词短语先行词 under the tree on the hill) you can enjoy the whole view.That was in 1949,(先行词为介词短语) since when(when代替介词短语先行词 in 1949) things have been better.They left in Monday,(先行词为介词短语) since when(when代替介词短语先行词in Monday)we have heard nothing.I went to bed at ten,(先行词为介词短语) before when (when代替介词短语先行词at ten)I was reading for an hour.Next summer,(先行词为省略in介词短语) by when (when代替介词短语先行词Next summer)the house should be ready.练习1. He was blown off course and found himself in an unknown land,from he eventually reached Greenland.2. He stood under the tree, from he could see his son swimming.3. You can go across the river, from you can take a boat.4. The book was written in 1946, _ the education syste