In many African languages, noun classes determine agreement between the noun and other parts of speech.

Many students prefer the new sandwich classes because they combine lectures and hands-on labs.

In some set-theoretic frameworks, proper classes cannot be elements of other classes.

At the community center, they offer evening life classes for adults seeking practical skills.

Economic reforms have significantly altered the lifestyles and expectations of the middle classes across the region.

The new policies failed to address the needs of the working classes, leaving many families struggling.

Discussions about taxation often focus on the privileges and responsibilities of the upper classes.

The conference offered workshops specifically tailored to the needs of professional classes across multiple industries.

Debates about education often center on how to increase mobility between different social classes.

When composing atonal music, she mapped out the relationships between pitch classes to ensure a balanced distribution.