family 作"家人" 时表示复数概念，作主语时，谓动用复数；family一词不用复数形式。
family作"家庭" 时，表示家庭这个整体，是单数概念。作主语时，谓动用单数；family作"家庭" 时，有复数形式，families表示几个家庭。用作名词 (n.)1）There are five people in my family. 我家里有五口人。
2）He was born in a wealthy family. 他出生在一个富裕的家庭。用作形容词 (adj.) 1）Quarrels are a normal part of family life. 争吵是家庭生活正常的一部分。2）She works in the family business. 她在家族的企业工作。
