新东方考研语法讲堂161

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3.集体名词family，class，crew(全体船员或机组人员)，crowd, group, committee, audience, government, public, team, staff, population等做主语时，若作为一个整体看待，后面谓语动词用单数; 如就其中每一个成员来考虑时，则用复数。
    例如: My family is a big one.我家人多。
    My family are all music lovers. 我全家人都爱好音乐。
    Eighty percent of China' s population are peasants. 百分之八十的中国人口是农民。
     China has a huge population. 中国有众多的人口。
     The population of China is the largest in the world. 中国的人口是世界上最多的。
    People, police, cattle,(牛)，militia(民兵)，poultry(家禽)，vermin(害出)等作主语时，后面的动词要用复数。
    如：There were many people waiting outside. 有许多人在外面等着。
    The police are searching far the murderer. 警察在搜捕凶手。
    The cattle are grazing in the fields. 一群牛在田野里吃草。
    Foliage(树叶)，machinery(机械)，equipment(设备) ,furniture(家具)，merchandise(商品)等通常做不可数名词，动词用单数，
     如:The merchandise has arrived undamaged滴品已经到达，毫无损坏。
     All the machinery in the factory is made in China. 本工厂里的所有机械都是中国制造的，