1、A:The dictionary belongs to Tom,Its cover is red.
B:The dictionary,of which the cover is red,belongs to Tom.
2、A:The woman is a good driver.You went home in her car yesterday.
B:The woman,in whose car_you went home yesterday,is a good driver.
3、A:The man is a history teacher.I worked with his son.
B:The man,with whose son_I worked,is a history teacher.
4、A:He lives in a room,the window of which faces south.
B:He lives in a room,whose windows_ faces south.