1、a pair of 后面的词,总体意思里,是可数的复数,如两个强盗,用复数谓语。举例: A pair of robbers were trying to kidnap his wife. 两个强盗正试图绑架他的妻子。
2、如果后面的词,虽然是复数,其实是单数的意思,比如a pair of shoes,虽然是两只鞋,但其实鞋子都是两只的,因此,这其实是单数,表示是“一双鞋子”。举例: Between saying and doing, many a pair of shoes is worn out. 说出的话要来做,许多双鞋子得磨破;说来容易做来难。