定语从句中the day的用法

首先你应该了解一下定语从句,其中选择关系代词还是关系副词的用法,如果后面的动词不缺主语或宾语就用when,否则就用that或which
当先行词是表时间的time,day等和表地点的place,house等时,一定要注意分析从句的结构,如果缺少主语或宾语时,关系词应该用which或that,缺少时间状语或地点状语时,才能用when或where,试比较：
I’ll never forget the day when my hometown was liberated.
I’ll never forget the days which/that we spent together last summer.
His father works in a factory where radio parts are made.
His father works in a factory which/that makes radio parts.