this coat is not mine but yours

this coat is not mine but yours "is this coat yours?No,it's not mine."此句中为什么要用yours和mine? " I think this is not mine _____ yours." 这里空格中填 or 好还是but好? is this coat yours?no,mine is hanging there behind the door —Is this coat _____? —Yes,it's _____. A.yours;mine B.your;my ——Is this coat yours?——No,mine __there behind the door. It is not yours,it is mine. This is MINE,That is MINE,Mine is MINE,Yours is MINE,Everyth John,is this computer game yours?No,it is not mine.Ask the t whose pen is this?is it yours?no it's not mine.maybe it's() Alice is not ____friend but also___ A yours,mine B his her C Whose coat is this Is it (　　　　）,Steve?----No.It's not mine .