Purpose sentence bank and 3 samples

Dear Sir or Madam,

I am writing to request additional information about the weekend language course.

Could you please confirm the class schedule, course fee, and whether study materials are included?

I would appreciate your response at your earliest convenience.

Yours faithfully,
A Student

Dear School Librarian,

I am writing to suggest several improvements to our school library.

Adding more exam-preparation books and creating a quiet study corner would greatly support students.

Thank you for considering these suggestions.

Yours sincerely,
A Student

Dear Manager,

I am writing to express my concern regarding the condition of the gym changing rooms.

The area is often overcrowded and not cleaned regularly, which causes inconvenience.

I would be grateful if this issue could be resolved soon.

Yours sincerely,
A Student