Question

在定语从句中，什么时候用关系代词，什么时候用关系副词，什么情况下用“介词+关系代词”，要高考了，

求求大家帮帮忙

Answer 1

什么时候用关系代词：定语从句中，先行词是人或物，而引导词充当从句中的主语、宾语、表语时，用关系代词；
The book that/which was written by him sells well.（先行词是the book，引导词在从句中充当主语）
The book that he wrote sells well..（先行词是the book，引导词在从句中充当宾语）
什么时候用关系副词：定语从句中，先行词是表示时间、地点的词时，而引导词在从句中充当时间、地点状语时，用关系副词；先行词是the reason，定语从句引导词一般为why。在使用关系副词时，从句结构是完整的（也就是不缺少主谓宾）
什么情况下用“介词+关系代词”：这个有点难解释。这样说吧，介词的选择是由两种情况：
1.看先行词决定：
如：I will never forget the day on which I joined the army.
I will never forget the year in which I joined the army.
2.看从句谓语搭配决定：
He had nobody to whom he could turn because it was too late.
This is the house in which I lived two years ago.

Answer 2

这个问题比较复杂，我只能简单说下。

用什么连接词来链接主要是看连接词在从句中冲淡什么句子成分。
当在从句中充当主语，宾语等时，就要用连接代词
在从句中充当状语时，就要用连接副词了

介词+连接代词：他完全等于一个连接副词，但代换的时候具体用什么介词需要判断，比如which=介词+where这些。

我说的连接代词和你说的关系代词是同一个，只不过叫法不同而已。

有什么疑问还可以问我，我一直在线。

Answer 3

思考：以下句子的先行词分别是表地点、时间和原因的，为什么不用关系副词？
1.The factory which/that was built in 1978 has closed. 1978年建的那家工厂关闭了。
2.I’ll never forget the days (that) we spent in Australia. 我永远也忘不了我们在澳大利亚度过的那些日子。
3.The reason (that) he gave for his absence was obviously fabricated.他所说的缺席理由显然是编造的。
因为1、2、3句的先行词分别在从句中作主语、宾语、宾语。
注意：先行词虽然是时间或地点，但若在定语从句中作主语或宾语时，要用关系代词。
I’ll never forget the days when we lived together. 我永远也忘不了我们一起生活的那些日子。
The factory where his father worked has closed. 他父亲曾工作的那家工厂关闭了。
The reason (why) she was ill was that she had eaten bad meat. 她生病的原因是她吃了变质的肉。
这些句子的先行词分别在从句中作状语，所以用关系副词