关于定语从句的问题1.先行词是 时间用when,地点用where,原因用why 用关系副词 2.从句中的副词是不及物动词

也不是凡是先行词是时间都用when是地点都用where是原因都用why,得看这个词在从句中作什么成分.如I never forget the day (which/that) I spent in the village.I never forget the day when I stayed with you.=I never forget the day .On the day I stayed with you.=I never forget the day on which I stayed with you.
至于关系副词一般可以用介词加关系代词替换,判断用哪个介词有两个原则：一,看先行词与介词的关系,如reason常与for搭配,the day 与on 搭配,二、看动词与先行词的关系.如The man with whom I go fishing is Mr wang.具体的看看定语从句的相关语法解释

对，你说的没错，关键是看先行词在从句中所充当的成分，要是在从句中作状语，就用关系副词；要是在从句中作宾语，宾语补足语等，应当用关系代词。其次，具体要用哪个介词，你可以根据句意判断，例如：The day on which i realise my dream .在从句中作时间状语，因此要用介词 on ....