The pair of jeans()(not be)yours.It's mine

The old jeans are not mine,that new pair of jeans is mine Look at the book,it's not mine,and it's not yours,so it must _____(be)the pair of glasses yours The of new (s__ )is mine ,not yours What color _____(be) the the pair of glasses on the desk (be)mine It is not yours,it is mine. whose pen is this?is it yours?no it's not mine.maybe it's() another pair of jeans为什么加S "is this coat yours?No,it's not mine."此句中为什么要用yours和mine? This pair of shoes __ not yours . be 动词填空There __two pairs of jeans on the bed.the new pair of _________ this book be yours?---- No,it ________ not be mine