which的用法：
A shop should keep a stock of those goods which sell best.
商店應存有最暢銷的貨物。
This is the family which is planning to move to the city.
這是要搬進城里的一家。
This is a reason which we must not forget.
這是我們不能忘記的一個原因。
When deep in thought, which he often was, he would forget all around him.
他常常陷入沉思，這時他就會忘掉周圍的一切。
He bought a book, which was written by LuXun, and which he decided to give to his friend.
他買了本魯迅寫的書，他決定送給朋友。
whose的用法：
The girl whose hair is golden is from England.
頭發金色的那個女孩是英國人。
The house whose doors are green is an office building.
門是綠色的那座房子是辦公樓。
I saw a woman whose bag was stolen.
我看見一個包被偷的女人。
They lives in a room whose window opens to the south.
他們住在一間窗戶朝南開的房間里。
Mr King,whose legs were badly hurt, was taken to the hospital.
金先生腿受重傷，被送進了醫院。