1.单数集体名词被视为一个整体时,用单数动词.如：
Our family has a reunion every year.
2.如果被看成是若干个体时,用复数动词.如：
His family are waiting for him.
3.有些单数形式的集体名词,如police,cattle等,只能用复数动词,因为他们不表示单个的概念.policeman,policewoman指代单数,police是复数概念.