This document provides instructions and guidelines for writing a formal letter in Croatian. It explains the typical structure of a letter, including placing the date and location in the top right corner, addressing the recipient in the top left corner, including an introductory paragraph stating the purpose or reason for writing, the main body of the letter, and a concluding paragraph with a sign-off and signature. It also notes letters should be written neatly, legibly, and clearly using print letters with a ballpoint pen. Students are assigned to write an imaginative letter to "Corona" the virus personified, applying the letter-writing guidelines and sharing their feelings and perspective on the pandemic situation.