通常a couple of后面用復(fù)數(shù)名詞,它的意思相當(dāng)于a few.a couple of days的意思相當(dāng)a few days.這類詞組作主語(yǔ)時(shí),謂語(yǔ)動(dòng)詞常用復(fù)數(shù)形式,例如：A couple of/ a few days have passed.但用于there be的句型時(shí),因?yàn)榱?xí)慣上要遵循就近一致的原則,所以一般用單數(shù)的動(dòng)詞形式,例如：There is a couple of vacant rooms behind the office.