The plurals of most nouns are formed by adding -s or -es. However, English is irregular enough that it pays to consult a dictionary for most forms. Collective nouns may take either singular or plural verbs, depending on whether the word refers to the group as a unit or to its members as individuals. In American English, most nouns naming a group regarded as a unit are treated as singular. (See also 7.8.5, Grammar, Subject-Verb Agreement, Collective Nouns.)...