关于主谓一致,我有一个疑问,就是 a set of keys 作主语时,它后后面的谓语动词为什么用的是单数?
用单数或复数都可以:若把 a set of keys 视为一个整体,则用单数谓语动词;若侧重考虑 a set of keys 中的每一个 key,则用复数谓语动词。如:
A set of keys was swinging from his belt. 一串钥匙在他的腰带上摆来摆去。
A set of keys were swinging from his belt. 一串钥匙在他的腰带上摆来摆去。
强调的是一串不是两或更多串钥匙就是单数,强调的钥匙不是其他的物品就用复数,看语境而定。