This is the house in which I have lived for 2 years.in which 原句能不能改为This is the house （that） I have lived for 2 years.in是不是应该在lived后面若定语从句中有介词，那是否必须把介词往提前呢？

in which 也可以是where 引导地点

此句子为定语从句（in which I have lived for 2 years 为house的定语（既修饰语，相当于形容词）
此句还可以写成 This is the house which I have lived in for 2 years.此时的which可以省略变成This is the house I have lived in for 2 years.
也可写成This is the house （that） I have lived in for 2 years.但此时的in必须加在live的后面，不可放在that引导词的前面

in which 在这里相当于where where为关系副词 无实义 ;不能改为This is house (that)I have lived for 2 years 若在lived后加上in 就对了

in which 是定于从句，相当于 I lived in the house for 2 years。

This is the house in which I have lived for 2 years.是由This is the house which I have lived in for 2 years.变过来的 通常用第一钟这是which与that的一个区别 ,which前可以加介词,相当于 I lived in the hous...

是的