As a noun:
* Formal: "She has the necessary qualifications to apply for the job."
* Informal: "His lack of qualifications made him a poor candidate."
* Descriptive: "The course offered several valuable qualifications for a career in marketing."
As a verb:
* Formal: "The candidate's experience qualified her for the position."
* Informal: "That experience doesn't qualify as a real job."
* Descriptive: "The interview process helped to qualify the best candidate."
Let me know if you'd like me to give you more examples or help you write a specific sentence using "qualification."