Macbeth has been adapted so many times for the same reason why all Shakespeare's plays have been adapted so many times. It is because they are not bound to a single point in time and by changing temporal details it can be applicable to any society at any time. The theme that is "power corrupts" has been ever present and this is why it keeps getting adapted.
Answer:
Usefulness or uses
Explanation:
Makes sense grammatically and logivally.
A proper noun is usually capitalized. It can be a name, city, or movie title. A person place or thing but more specific.
It is a verb!! Hope it helped!! :)