1、This pair of shoes is new,can I try them on?主语是this pair 应该用单数。

2、后面试穿两只shoes用them。

3、至于This pair of glasses is new,can I try them on?还有pants等这类词还是用them.This bowl of rice is mine.全部用单数。

4、如果量词是复数，当然谓语用复数。

5、These two pairs of shoes are new,can I try them on?