The old jeans are not mine,that new pair of jeans is mine

问题描述:

The old jeans are not mine,that new pair of jeans is mine
The old jeans (are) not mine,that new pair of jeans is mine.
为什么第一个用ARE?

jeans n.牛仔裤;工装裤 复数、可数 所以用are
后半句的主语是that new pair,为单数,因此用is