1. When "class" refers to a group of people:
* Not capitalized: If you're talking about a general group of people, like "The class was very quiet today."
* Capitalized: If you're referring to a specific group, like "I enjoyed Mr. Smith's English class."
2. When "class" refers to a social or economic ranking:
* Not capitalized: "They belong to the upper class."
3. When "class" is part of a proper noun:
* Capitalized: "I'm taking a Computer Science class at the University of California."
Here are some examples:
* Not capitalized: The class learned about the solar system.
* Capitalized: I aced my Chemistry class.
* Not capitalized: She's always been interested in history.
* Capitalized: The British royal family is part of the upper class.
* Capitalized: I'm taking a Philosophy class at the University of Oxford.
In short, "class" is generally lowercase unless it's part of a proper noun or referring to a specific group.