Question

a couple of谓语动词用单数还是复数，可修饰什么

Answer 1

通常a couple of后面用复数名词，它的意思相当于a few.a couple of days的意思相当a few days.这类词组作主语时，谓语动词常用复数形式，例如：A couple of/ a few days have passed. 但用于there be的句型时，因为习惯上要遵循就近一致的原则，所以一般用单数的动词形式，例如：There is a couple of vacant rooms behind the office.