这些都是定语从句里面,由which引导的定语从句,介词提前.
in which可以翻译成在„„里面 of which可以翻译成……的
on which可以翻译成在„„的上面,或具体时间的某一天
这些介词的使用除了意思上的区别,具体是要以which引导的从句而定的.
例如：
(1) The school (that/which) he once studied in is very famous.= The school in which he once studied is very famous.
(2) I have a dresser in my bedroom,which there are many cosmetics on.= I have a dresser in my bedroom on which there are many cosmetics.
（3）The house the roof of which was damaged has now been repaired.那幢屋顶被损坏的房子现在已经修好了.现在很清楚了。谢谢你。