whose在定语从句中充当什么成分

　　I like this house whose window faces east.

　　我喜欢这间房子,它的窗户是面朝东方的.

　　Whose is that farm over yonder?

　　那边的农场是谁的？

　　I can't remember whose idea it was for us to meet again.

　　我记不清我们再次会面是谁的主意了。