1. A class of students: Our class was given a quiz.
2. A class of people: The upper class has more wealth and power.
3. A class of animals: The reptile class consists of animals such as snakes, lizards, and turtles.
4. A class of words: The word "dog" is part of the noun class.
5. A class of objects: The sports car class includes vehicles like the Porsche and Lamborghini.