families
How many 是多少,后面名词用复数但是family是一个集体名词？书上说是“被看做整体时，做单数；若强调组成该集体的各个成员时，做复数”这个题不在这个规则中，只是我说的How many 是多少，后面名词用复数。你说的情况是下面这种：His family is very large.The family are having dinner now.