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

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

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

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

因为裤子是一条,两个脚,所以复数
第二个用了量词pair,单数化了,所以单数

jeans 做牛仔裤是用复数 所以用are
第二个 是pair作主语 所以用 is

复数用are

前面的这个句子的主语是jeans,所以用are.
后面的这个句子的主语是pair,所以用is.