I was at church on the monday 为何要加不用加the?I was at the office on the monday 为何又要加the
问题描述：
I was at church on the monday 为何要加不用加the?
I was at the office on the monday 为何又要加the
答
不要THE
答
特指是“这个”星期一
答
at church 固定用法,不用加the
（一般一个社区只有一个教堂,所以不用特指就知道是哪个教堂.）
特指某个office,要加the
（office比较多,需要用the来特指）
答
the monday
是特指某个周一，，
而且monday要大写：Monday