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Whether a collective noun, which is singular in form, is used with a singular or plural verb depends on whether the word is referring to the group as a unit or to its members as individuals. In American English, a collective noun naming an organization regarded as a unit is usually treated as singular: The corporation is holding its annual meeting. The team is having a winning season. The government has taken action. In British English, such nouns are commonly treated as plurals: The corporation are holding their annual meeting. The team are playing well. The government are in agreement. When a collective noun naming a group of persons is treated as singular, it is referred to by the relative pronoun that or which: His crew is one that (or which ) works hard. When such a noun is treated as plural, the pronoun is who: His crew are specialists who volunteered for the project. In formal speech and writing, collective nouns are usually not treated as both singular and plural in the same sentence: The enemy is fortifying its (not their ) position. The enemy are bringing up their heavy artillery. When the collective nouns couple and pair refer to people, they are usually treated as plurals: The newly married couple have found a house near good transportation. The pair are busy furnishing their new home. The collective noun number, when preceded by a, is treated as a plural: A number of solutions were suggested. When preceded by the, it is treated as a singular: The number of solutions offered was astounding. Other common collective nouns are class, crowd, flock, panel, committee, group, audience, staff, and family.