of：belonging to 属于
on：on top of 上面
in：inside 里面
at：at the location 在
Example：
He‘s a teacher of this school：他是属于这所学校的教师.
He’s a teacher working at this school：他是在这所学校工作的教师.
He's currently in the school：他现在在学校里.
He's on the school roof：他在学校楼顶上.