Final answer:
Lawyers, teachers, and plumbers who provide skilled services but work for someone else are considered employees. They typically hold occupational licenses, indicating completion of education or passage of tests, differentiating them from entrepreneurs or freelancers.
Step-by-step explanation:
Lawyers, teachers, and plumbers, despite having distinct professional skills, are considered to be employees when they provide skilled services but work for someone else.
These professions may require significant education, training, and occupational licenses, which ensure a certain level of proficiency and are often mandatory for legal operation within their respective fields. Occupational licenses are issued by government agencies, showcasing that a worker has completed required education or passed a specific test, hence not everyone in these roles can be considered an entrepreneur or freelancer.