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1） 在代词what, which, who, none, some, any, more, most, all等词的单复数由其指代的词的单复数决定。 All is right. (一切顺利。) All are present. (所有人都到齐了。) 2） 集体名词作主语时，谓语的数要根据主语的意思来决定。如family, audience, crew, crowd, class, company, committee等词后用复数形式时，意为这个集体中的各个成员，用单数时表示该个集体。 His family isn’t very large. 他家不是一个大家庭。http://yingyu.chazidian.com His family are music lovers. 他的家人都是音乐爱好者。 但集合名词people, police, cattle, poultry等在任何情况下都用复数形式。 Are there any police around? 3）有些名词，如variety, number, population, proportion, majority 等有时看作单数，有时看作复数。 A number of +名词复数+复数动词。 The number of +名词复数+单数动词。 A number of books have lent out. The majority of the students like English. | 
