* For a crime: The suspect was arrested for impersonation after posing as a doctor to gain access to the hospital.
* For entertainment: The comedian's impersonation of the famous politician was hilarious.
* For a role: The actress's impersonation of the historical figure was so convincing, it felt like she was actually stepping out of the pages of a book.
* For a computer system: The hackers gained access to the system using impersonation to bypass security protocols.
Let me know if you'd like more examples or have a specific context in mind!