Question

定语从句- -I will never forget the days() I worked in t he schoo

Answer 1

I will never forget the days( when /in which ) I worked in t he school先行词在从句中作时间状语,也可以写作介词加关系代词

I will never forget the day（ when /on which )I joined the army同上

I will never forget the day ( when /on which )my sonwent to college同上

I got home at7.00P.M yesterday,( when /at which )most people had had suppur 同上