I will never forget the day when we joined the Part.改为简单句是不是：
I will never forget the day.I joined the Party on the day.This is the record that you gave me.改为简单句：This is a record.You gave me the record.第一句简单句中的I will never forget the day.I joined the Party on the day.forget后面的day 要用介词the 那为什么第二句This is a record.You gave me the record is 后面用介词a 这有矛盾吗?有没有规定说定语从句改为简单句 简单句中的冠词一定要用the 或者a