关系词的选择依据在从句中所做的成分,先行词在从句中做主、定、宾语时,选择关系代词 (who, whom, that, which, whose); 先行词在从句中做状语时,应选择关系副词 ( where 地点状语,when 时间状语,why 原因状语)
他们和关系代词主要的区别是where,when,why=介词+which
eg:This is the house in which (where) I lived last year.
This is the reason for which (why) he was late for school.
That's the on which day (when) I met him in the street.
以上也是我在百度上搜到的。
我再将他给的例句还原一下从句部分就是
I lived in the house last year 但是你不能说 I lived the house. 用这种方法你就可以分辨出需不需要加介词了,若是分割后不能成为一个完整的句子时就要加介词,若是不加介词的话就用关系副词直接状语修饰。像是 Where I lived 就可以。
我也不确定解释的对不对要是还不清楚再问我吧。
关系代词是在定语从句里的,连接代词和连接副词是名词性从句里的,连接代词有who,whom,whose,what,which,whatever,whichever,whoever等,连接副词有when,why,how,where等