1.Football is a game which is liked by most boys.
2.We\’ll go to hear the famous singer (whom/that/who) we have often talked about.
3.He bought a book, which was written by LuXun, and which he decided to give to his friend.
4.We told him to consult the doctor,which advice he took.
\” what从句 = 名词+ which从句\”.
就是没有想到 what从句 = 名词+ which从句
a pen is what I want (what 从句作表语)
a pen is the present which I want.(名词+ which从句作表语,虽然这里which从句是 present 的定语)