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5. 在定语从句时，关系代词that, who, which等作主语时，其谓 语动词的数应与句中先行词的数一致。如：He is one of my friends who a
re working hard. / He is the only one of my friends who is working hard. 6. 如果集体名词指的是整个集体，它的谓语动词用单数；如果它指 集体的成员，其谓语动词就用复数形式。这些词有family, class, crowd, committee, population, audience等。如：Class Four is on the third floor. / Class Four are unable to agree upon a monitor. 注意：people, police, cattle等名词一般都用作复数。如：The police are looking for the lost child.