Los perros llevan collares.
the dogs are wearing collars.
A claim of fact makes a statement about something that can be proved or disproved with factual evidence. However, keep in mind the basic quality of claims, that they have to be debatable, and offer an assertion about an issue.
What makes <em>The Importance of Being Earnest </em>a comedy of manners is the way it satirized the behavior of the Victorian aristocracy.
It mocks the rich, and shows how shallow and inconsiderate they are, thinking only about trivial things.