举例：
This is the school which I visited last year.(visit the chool,visit 后直接接宾语）
This is the school where I studied last year.( study in the school,in the school是地点状语）
I remember the day we spent together.(spend the day together,the day 是spend的宾语）
I remember the day when we played together ( play together on that day,on that day 是时间状语）