• Some nouns have irregular plurals that do not follow regular plural rules.
• Irregular plurals may involve changing the f to a v and adding -es in words that end in -f or -fe, changing a middle vowel sound and spelling, and using different endings.
• In addition, irregular plurals may involve making no change to a word (such as deer/deer) or using a completely new word altogether (person/people).
• Collective nouns are words that name groups of people, places, or things, such as class or army.
Decide whether the underlined is singular (one) or plural (more than one).
Slowly, the lonely buffalo moved across the grassy plains.