如何理解介词+关系代词引导的定语从句

定语从句: 在复合句中修饰名词或代词的句子在复合句中充当定语，所以叫作定语从句。 先行词： 定语从句所修饰的名词或代词。 关系词： 引导定语从句的词，分为关系代词（who,whom,that,which,whose）和关系副词(where,when,why,)。 复合句 ： The man who (that) came is Mike. 先行词 关系代词 Li Ming is the one that got full marks in our class. 先行词 关系代词 上句的黑体字为复合句中的主句，蓝体字为定语从句. 一 定语从句的关系代词 Which的用法: 若先行词指物则代替先行词在定语从句中充当主语或宾语. This is the pen which was given by my friend. 先行词 指物代替先行词在定语从句中充当主语 This is the pen which my friend gave to me. 先行词 指物代替先行词在定语从句中充当宾语 二 定语从句的关系代词 Who的用法: 若先行词指人则代替先行词在定语从句中充当主语或宾语(如果前面带介词则必须用whom) The man who is wearing a white suit is my brother. 先行词 指人代替先行词在定语从句中充当主语 The man who\whom he wanted to see last week is in Shanghai. 先行词 指人代替先行词在定语从句中充当宾语 She is the girl with whom I went there. 先行词 指人代替先行词在定语从句中充当介宾且介词于前. 三 定语从句的关系代词 Whom的用法: 若先行词指人则代替先行词在定语从句中充当宾语(包括介词的宾语) ,与who的区别是如果前面带介词则必须用whom This is the teacher whom\who we like best. 先行词 指人代替先行词在定语从句中充当宾语 She is the girl whom\ who I went with there. 先行词 指人代替先行词在定语从句中充当介宾. I don’t like the boy to whom you are talking.

介词+关系词
1）介词后面的关系词不能省略.
2）that前不能有介词.
3） 某些在从句中充当时间,地点或原因状语的"介词+关系词"结构可以同关系副词when 和where 互换.
This is the house in which I lived two years ago.
This is the house where I lived two years ago.
Do you remember the day on which you joined our club?
Do you remember the day when you joined our club?
w