定语从句如何判断引导词用which还是when where

定语从句如何判断引导词用which还是when where

先行词在定语从句中充当一定的成分，如作主语、宾语或定语等，要用关系代词which; 当先行词在定语从句中充当地点状语时，用关系副词where，可用介词加which代替。
1）Please find a room which is big enough for all of us to live in. (请找一间足够大能住下我们全体的房间。) 作主语
2）This is the room where they had a quarrel a week ago. (这是一个星期前他们吵架的房间。)
作地点状语，相当于in the room ,可用in which代替where

只可用that. 下列情况只可用“that”而不可用“which”： 1. 序数词或最高级形容词或叙述此修饰先行词，如first,best 2. 先行词是all, little, much, few, anything, nothing, something, none, the one时 3. 先行词被any, few, little, all, no 修饰时 4. 先行词被the only, the very, the same, the last修饰时 5. 先行词既有人又有物时。 6. 当句中已有who时，为避免重复。 高中阶段知道这些就可以了。